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Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission

ASTROPARTICLE PHYSICS (2008)

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ASTROPARTICLE PHYSICS
Volume 29, Issue 1, Pages 63-69

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ELSEVIER
DOI: 10.1016/j.astropartphys.2007.11.008

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gamma rays : theory; TeV gamma rays; TeV sources

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Astronomy & Astrophysics Physics, Particles & Fields

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The detection by the HESS atmospheric Cerenkov telescope of 14 new sources from the Galactic plane makes it possible to estimate the contribution of unresolved sources like those detected by HESS to the diffuse Galactic emission measured by the Milagro Collaboration. The number intensity relation and the luminosity function for the HESS source population are investigated. By evaluating the contribution of such a source population to the diffuse emission we conclude that a significant fraction of the TeV energy emission measured by the Milagro experiment could be due to unresolved sources like HESS sources. Predictions concerning the number of sources which Veritas, Milagro, and HAWC should detect are also given. (c) 2007 Elsevier B.V. All rights reserved.

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Article Astronomy & Astrophysics

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NATURE ASTRONOMY (2021)

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Article Astronomy & Astrophysics

HAWC Search for High-mass Microquasars

A. Albert, R. Alfaro, C. Alvarez, J. R. Angeles Camacho, J. C. Arteaga-Velazquez, K. P. Arunbabu, D. Avila Rojas, H. A. Ayala Solares, V. Baghmanyan, E. Belmont-Moreno, S. Y. BenZvi, C. Brisbois, K. S. Caballero-Mora, T. Capistran, A. Carraminana, S. Casanova, U. Cotti, J. Cotzomi, E. de la Fuente, C. de Leon, R. Diaz Hernandez, J. C. Diaz-Velez, B. L. Dingus, M. Durocher, M. A. DuVernois, R. W. Ellsworth, C. Espinoza, K. L. Fan, K. Fang, N. Fraija, A. Galvan-Gamez, J. A. Garcia-Gonzalez, F. Garfias, M. M. Gonzalez, J. A. Goodman, J. P. Harding, S. Hernandez, B. Hona, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, D. Kieda, A. Lara, J. Lee, W. H. Lee, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, J. Lundeen, K. Malone, O. Martinez, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafa, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, N. Omodei, A. Peisker, Y. Perez Araujo, C. D. Rho, Y. J. Roh, D. Rosa-Gonzalez, F. Salesa Greus, A. Sandoval, M. Schneider, J. Serna-Franco, A. J. Smith, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, R. Turner, F. Urena-Mena, L. Villasenor, I. J. Watson, T. Weisgarber, E. Willox, H. Zhou

Summary: Using the HAWC observatory, no significant excess gamma-ray emission above 10 TeV was observed around high-mass microquasars, setting stringent limits on their emission. Different scenarios were considered, with the result that models suggesting observable high-energy neutrino emission by HMMQs are tightly constrained. The non-detection of VHE gamma rays also challenges the dominance of synchrotron radiation as the microquasar emission mechanism between 10 keV and 10 MeV.

ASTROPHYSICAL JOURNAL LETTERS (2021)

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Article Astronomy & Astrophysics

Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

J. C. Algaba, J. Anczarski, K. Asada, M. Balokovic, S. Chandra, Y-Z Cui, A. D. Falcone, M. Giroletti, C. Goddi, K. Hada, D. Haggard, S. Jorstad, A. Kaur, T. Kawashima, G. Keating, J-Y Kim, M. Kino, S. Komossa, E. Kravchenko, T. P. Krichbaum, S-S Lee, R-S Lu, M. Lucchini, S. Markoff, J. Neilsen, M. A. Nowak, J. Park, G. Principe, V Ramakrishnan, M. T. Reynolds, M. Sasada, S. S. Savchenko, K. E. Williamson, Kazunori Akiyama, Antxon Alberdi, Walter Alef, Richard Anantua, Rebecca Azula, Anne-Kathrin Baczko, David Ball, John Barrett, Dan Bintley, Bradford A. Benson, Lindy Blackburn, Raymond Blundell, Wilfred Boland, Katherine L. Bouman, Geoffrey C. Bower, Hope Boyc, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Avery E. Broderick, Dominique Broguiere, Thomas Bronzwaer, Do-Young Byun, John E. Carlstrom, Andrew Chael, Chi-kwan Chan, Shami Chatterjee, Koushik Chatterjee, Ming-Tang Chen, Yongjun Chen, Paul M. Chesler, Ilje Cho, Pierre Christian, John E. Conway, James M. Cordes, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S. Doeleman, Ralph P. Eatough, Heino Falcke, Joseph Farah, Vincent L. Fish, Ed Fomalont, H. Alyson Ford, Raquel Fraga-Encinas, Per Friberg, Christian M. Fromm, Antonio Fuentes, Peter Galison, Charles F. Gammie, Roberto Garcia, Olivier Gentaz, Boris Georgiev, Roman Gold, Jose L. Gomez, Arturo I. Gomez-Ruiz, Minfeng Gu, Mark Gurwell, Michael H. Hecht, Ronald Hesper, Luis C. Ho, Paul Ho, Mareki Honma, Chih-Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, Makoto Inoue, Sara Issaoun, David J. James, Buell T. Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D. Johnson, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Mark Kettenis, Dong-Jin Kim, Jongsoo Kim, Junhan Kim, Jun Yi Koay, Yutaro Kofuji, Patrick M. Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Cheng-Yu Kuo, Tod R. Lauer, Aviad Levis, Yan-Rong Li, Zhiyuan Li, Michael Lindqvist, Rocco Lico, Greg Lindahl, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P. Lobanov, Laurent Loinard, Colin Lonsdale, Nicholas R. MacDonald, Jirong Mao, Nicola Marchili, Daniel P. Marrone, Alan P. Marscher, Ivan Marti-Vidal, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Izumi Mizuno, Yosuke Mizuno, James M. Moran, Kotaro Moriyama, Monika Moscibrodzka, Cornelia Mueller, Gibwa Musoke, Alejandro Mus Mejias, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino, Hector Olivares, Gisela N. Ortiz-Leon, Tomoaki Oyama, Feryal Ozel, Daniel C. M. Palumbo, Nimesh Patel, Ue-Li Pen, Dominic W. Pesce, Vincent Pietu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M. Potzl, Ben Prather, Jorge A. Preciado-Lopez, Dimitrios Psaltis, Hung-Yi Pu, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Angelo Ricarte, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Chet Ruszczyk, Kazi L. J. Rygl, Salvador Sanchez, David Sanchez-Arguelles, Tuomas Savolainen, F. Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Paul Tiede, Remo P. J. Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Tyler Trent, Efthalia Traianou, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Maciek Wielgus, George N. Wong, Qingwen Wu, Doosoo Yoon, Andre Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J. Anton Zensus, Guang-Yao Zhao, Shan-Shan Zhao, G. Principe, M. Giroletti, F. D'Ammando, M. Orienti, H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E. O. Anguner, C. Arcaro, C. Armand, T. Armstrong, H. Ashkar, M. Backes, V. Baghmanyan, V. Barbosa Martins, A. Barnacka, M. Barnard, Y. Becherini, D. Berge, K. Bernlohr, B. Bi, M. Bottcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, M. Breuhaus, F. Brun, P. Brun, M. Bryan, M. Buchele, T. Bulik, T. Bylund, S. Caroff, A. Carosi, S. Casanova, T. Chand, A. Chen, G. Cotter, M. Curylo, J. Damascene Mbarubucyeye, I. D. Davids, J. Davies, C. Deil, J. Devin, P. deWilt, L. Dirson, A. Djannati-Atai, A. Dmytriiev, A. Donath, V. Doroshenko, C. Duffy, J. Dyks, K. Egberts, F. Eichhorn, S. Einecke, G. Emery, J. -P. Ernenwein, K. Feijen, S. Fegan, A. Fiasson, G. Fichet de Clairfontaine, G. Fontaine, S. Funk, M. Fuessling, S. Gabici, Y. A. Gallant, G. Giavitto, L. Giunti, D. Glawion, J. F. Glicenstein, D. Gottschall, M. -H. Grondin, J. Hahn, M. Haupt, G. Hermann, J. A. Hinton, W. Hofmann, C. Hoischen, T. L. Holch, M. Holler, M. Horbe, D. Horns, D. Huber, M. Jamrozy, D. Jankowsky, F. Jankowsky, A. Jardin-Blicq, V. Joshi, I. Jung-Richardt, E. Kasai, M. A. Kastendieck, K. Katarzynski, U. Katz, D. Khangulyan, B. Khelifi, S. Klepser, W. Kluzniak, Nu. Komin, R. Konno, K. Kosack, D. Kostunin, M. Kreter, G. Lamanna, A. Lemiere, M. Lemoine-Goumard, J-P Lenain, C. Levy, T. Lohse, I. Lypova, J. Mackey, J. Majumdar, D. Malyshev, D. Malyshev, V. Marandon, P. Marchegiani, A. Marcowith, A. Mares, G. Marti-Devesa, R. Marx, G. Maurin, P. J. Meintjes, M. Meyer, R. Moderski, M. Mohamed, L. Mohrmann, A. Montanari, C. Moore, P. Morris, E. Moulin, J. Muller, T. Murach, K. Nakashima, A. Nayerhoda, M. de Naurois, H. Ndiyavala, F. Niederwanger, J. Niemiec, L. Oakes, P. O'Brien, H. Odaka, S. Ohm, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, M. Panter, S. Panny, R. D. Parsons, G. Peron, B. Peyaud, Q. Piel, S. Pita, V. Poireau, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, G. Puhlhofer, M. Punch, A. Quirrenbach, R. Rauth, P. Reichherzer, A. Reimer, O. Reimer, Q. Remy, M. Renaud, F. Rieger, L. Rinchiuso, C. Romoli, G. Rowell, B. Rudak, E. Ruiz-Velasco, V. Sahakian, S. Sailer, D. A. Sanchez, A. Santangelo, M. Sasaki, M. Scalici, H. M. Schutte, U. Schwanke, S. Schwemmer, M. Seglar-Arroyo, M. Senniappan, A. S. Seyffert, N. Shafi, K. Shiningayamwe, R. Simoni, A. Sinha, H. Sol, A. Specovius, S. Spencer, M. Spir-Jacob, L. Stawarz, L. Sun, R. Steenkamp, C. Stegmann, S. Steinmassl, C. Steppa, T. Takahashi, T. Tavernier, A. M. Taylor, R. Terrier, D. Tiziani, M. Tluczykont, L. Tomankova, C. Trichard, M. Tsirou, R. Tuffs, Y. Uchiyama, D. J. van der Walt, C. van Eldik, C. van Rensburg, B. van Soelen, G. Vasileiadis, J. Veh, C. Venter, P. Vincent, J. Vink, H. J. Volk, T. Vuillaume, Z. Wadiasingh, S. J. Wagner, J. Watson, F. Werner, R. White, A. Wierzcholska, Yu Wun Wong, A. Yusafzai, M. Zacharias, R. Zanin, D. Zargaryan, A. A. Zdziarski, A. Zech, S. J. Zhu, J. Zorn, S. Zouari, N. Zywucka, V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, M. Artero, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, M. V. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano

Summary: In 2017, the Event Horizon Telescope Collaboration captured the first image of the center of the M87 galaxy, showcasing the dominance of core flux and presenting a simultaneous multi-wavelength spectrum of the active nucleus.

ASTROPHYSICAL JOURNAL LETTERS (2021)

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Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase

H. Abdalla, F. Aharonian, F. Ait Benkhali, E. O. Anguner, C. Arcaro, C. Armand, T. Armstrong, H. Ashkar, M. Backes, V Baghmanyan, V. Barbosa Martins, A. Barnacka, M. Barnard, Y. Becherini, D. Berge, K. Bernloehr, B. Bi, M. Bottcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, M. Breuhaus, R. Brose, F. Brun, P. Brun, M. Bryan, M. Buechele, T. Bulik, T. Bylund, F. Cangemi, S. Caroff, A. Carosi, S. Casanova, P. Chambery, T. Chand, S. Chandra, A. Chen, G. Cotter, M. Curylo, J. Damascene Mbarubucyeye, I. D. Davids, J. Davies, C. Deil, J. Devin, L. Dirson, A. Djannati-Atai, A. Dmytriiev, A. Donath, V Doroshenko, L. Dreyer, C. Duffy, L. Du Plessis, J. Dyks, K. Egberts, F. Eichhorn, S. Einecke, G. Emery, J-P Ernenwein, K. Feijen, S. Fegan, A. Fiasson, G. Fichet de Clairfontaine, G. Fontaine, S. Funk, M. Fuessling, S. Gabici, Y. A. Gallant, S. Ghafourizade, G. Giavitto, L. Giunti, D. Glawion, J. F. Glicenstein, M-H Grondin, J. Hahn, M. Haupt, S. Hattingh, G. Hermann, J. A. Hinton, W. Hofmann, C. Hoischen, T. L. Holch, M. Holler, M. Horbe, D. Horns, Z. Huang, D. Huber, M. Jamrozy, D. Jankowsky, F. Jankowsky, A. Jardin-Blicq, V Joshi, I Jung-Richardt, E. Kasai, M. A. Kastendieck, K. Katarzynski, U. Katz, D. Khangulyan, B. Khelifi, S. Klepser, W. Kluzniak, Nu Komin, R. Konno, K. Kosack, D. Kostunin, M. Kreter, G. Kukec Mezek, A. Kundu, G. Lamanna, A. Lemiere, M. Lemoine-Goumard, J-P Lenain, S. Le Stum, F. Leuschner, C. Levy, T. Lohse, A. Luashvili, I Lypova, J. Mackey, J. Majumdar, D. Malyshev, V Marandon, P. Marchegiani, A. Marcowith, A. Mares, G. Marti-Devesa, R. Marx, G. Maurin, P. J. Meintjes, M. Meyer, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, C. Moore, P. Morris, E. Moulin, J. Muller, T. Murach, K. Nakashima, A. Nayerhoda, M. de Naurois, H. Ndiyavala, J. Niemiec, L. Oakes, P. O'Brien, H. Odaka, S. Ohm, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, R. D. Parsons, G. Peron, B. Peyaud, Q. Piel, S. Pita, V Poireau, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, G. Puehlhofer, M. Punch, A. Quirrenbach, S. Raab, R. Rauth, P. Reichherzer, A. Reimer, O. Reimer, Q. Remy, M. Renaud, B. Reville, F. Rieger, L. Rinchiuso, C. Romoli, G. Rowell, B. Rudak, H. Rueda Ricarte, E. Ruiz-Velasco, V Sahakian, S. Sailer, H. Salzmann, D. A. Sanchez, A. Santangelo, M. Sasaki, J. Schaefer, F. Schussler, H. M. Schutte, U. Schwanke, M. Seglar-Arroyo, M. Senniappan, A. S. Seyffert, N. Shafi, J. N. S. Shapopi, K. Shiningayamwe, R. Simoni, A. Sinha, H. Sol, H. Spackman, A. Specovius, S. Spencer, M. Spir-Jacob, L. Stawarz, L. Sun, R. Steenkamp, C. Stegmann, S. Steinmassl, C. Steppa, T. Takahashi, T. Tanaka, T. Tavernier, A. M. Taylor, R. Terrier, J. H. E. Thiersen, C. Thorpe-Morgan, D. Tiziani, M. Tluczykont, L. Tomankova, C. Trichard, M. Tsirou, N. Tsuji, R. Tuffs, Y. Uchiyama, D. J. van der Walt, C. van Eldik, C. van Rensburg, B. van Soelen, G. Vasileiadis, J. Veh, C. Venter, P. Vincent, J. Vink, H. J. Voelk, Z. Wadiasingh, S. J. Wagner, J. Watson, F. Werner, R. White, A. Wierzcholska, P. DeWilt, Yu Wun Wong, H. Yassin, A. Yusafzai, M. Zacharias, R. Zanin, D. Zargaryan, A. A. Zdziarski, A. Zech, S. J. Zhu, J. Zorn, S. Zouari, N. Zywucka

Summary: Magnetar hyperflares are the most likely explanation for fast radio bursts. The first observational evidence supporting this scenario was obtained in April 2020, when an FRB was detected from the Galactic magnetar SGR 1935+2154. Follow-up observations by H.E.S.S. provided high-energy gamma-ray observations of a magnetar in a flaring state.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Study of the Very High Energy Emission of M87 through its Broadband Spectral Energy Distribution

R. Alfaro, C. Alvarez, J. C. Arteaga-Velazquez, D. Avila Rojas, H. A. Ayala Solares, E. Belmont-Moreno, T. Capistran, A. Carraminana, S. Casanova, U. Cotti, J. Cotzomi, S. Coutino de Leon, E. De la Fuente, C. de Leon, R. Diaz Hernandez, M. A. DuVernois, M. Durocher, J. C. Diaz-Velez, C. Espinoza, K. L. Fan, M. Fernandez Alonso, N. Fraija, J. A. Garcia-Gonzalez, F. Garfias, M. M. Gonzalez, J. A. Goodman, J. P. Harding, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, V. Joshi, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafa, A. Nayerhoda, L. Nellen, R. Noriega-Papaqui, N. Omodei, A. Peisker, E. G. Perez-Perez, C. D. Rho, D. Rosa-Gonzalez, H. Salazar, D. Salazar-Gallegos, F. Salesa Greus, A. Sandoval, J. Serna-Franco, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, F. Urena-Mena, L. Villasenor, X. Wang, E. Willox, A. Zepeda

Summary: This paper investigates the spectral energy distribution of M87 from radio to gamma rays and explains the nonflaring VHE emission using a lepto-hadronic emission model based on fitting the observed data.

ASTROPHYSICAL JOURNAL (2022)

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On the Search for the Galactic PeVatrons by Means of Gamma-Ray Astronomy

Sabrina Casanova

Summary: This paper provides a state of the art report on the search for the sources of Galactic cosmic rays using gamma-ray astronomical methods.

UNIVERSE (2022)

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Article Astronomy & Astrophysics

HAWC Detection of a TeV Halo Candidate Surrounding a Radio-quiet Pulsar

A. Albert, R. Alfaro, J. C. Arteaga-Velazquez, H. A. Ayala Solares, E. Belmont-Moreno, T. Capistran, A. Carraminana, S. Casanova, J. Cotzomi, S. Coutino De Leon, E. De la Fuente, C. de Leon, R. Diaz Hernandez, M. A. DuVernois, J. C. Diaz-Velez, C. Espinoza, K. L. Fan, N. Fraija, K. Fang, J. A. Garcia-Gonzalez, F. Garfias, A. Jardin-Blicq, M. M. Gonzalez, J. A. Goodman, J. P. Harding, S. Hernandez, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, V. Joshi, A. Lara, J. Lee, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, O. Martinez, J. Martinez-Castro, J. A. Matthews, J. A. Morales-Soto, E. Moreno, M. Mostafa, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, Y. Perez Araujo, Y. Son, E. G. Perez-Perez, C. D. Rho, D. Rosa-Gonzalez, A. Sandoval, M. Schneider, J. Serna-Franco, A. J. Smith, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, X. Wang, K. Whitaker, E. Willox, H. Zhou

Summary: With 2321 days of observation, the HAWC Gamma-Ray Observatory detected a TeV halo associated with PSR J0359+5414, indicating that TeV halos could commonly exist around pulsars and are not dependent on the configuration of the pulsar magnetosphere.

ASTROPHYSICAL JOURNAL LETTERS (2023)

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Acute Herpes Zoster Infection presenting with SUNCT: an uncommon presentation

S. Casanova, F. Sabenca, A. Rocha, M. Branco

EUROPEAN JOURNAL OF NEUROLOGY (2022)

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Article Astronomy & Astrophysics

Multimessenger Gamma-Ray and Neutrino Coincidence Alerts Using HAWC and IceCube Subthreshold Data

H. A. Ayala Solares, S. Coutu, J. J. DeLaunay, D. B. Fox, T. Gregoire, A. Keivani, F. Krauss, M. Mostafa, K. Murase, C. F. Turley, A. Albert, R. Alfaro, C. Alvarez, J. R. Angeles Camacho, J. C. Arteaga-Velazquez, K. P. Arunbabu, D. Avila Rojas, E. Belmont-Moreno, C. Brisbois, K. S. Caballero-Mora, A. Carraminana, S. Casanova, U. Cotti, E. De la Fuente, R. Diaz Hernandez, B. L. Dingus, M. A. DuVernois, M. Durocher, J. C. Diaz-Velez, C. Espinoza, K. L. Fan, H. Fleischhack, N. Fraija, A. Galvan-Gamez, D. Garcia, J. A. Garcia-Gonzalez, F. Garfias, M. M. Gonzalez, J. A. Goodman, J. P. Harding, B. Hona, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, J. Lundeen, K. Malone, O. Martinez, I. Martinez-Castellanos, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, A. Peisker, E. G. Perez-Perez, C. D. Rho, D. Rosa-Gonzalez, H. Salazar, F. Salesa Greus, A. Sandoval, A. J. Smith, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, F. Urena-Mena, L. Villasenor, T. Weisgarber, E. Willox, A. Zepeda, H. Zhou, C. de Leon, M. G. Aartsen, R. Abbasi, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, C. Alispach, N. M. Amin, K. Andeen, T. Anderson, I. Ansseau, G. Anton, C. Arguelles, J. Auffenberg, S. Axani, H. Bagherpour, X. Bai, A. V. Balagopal, A. Barbano, S. W. Barwick, B. Bastian, V. Basu, V. Baum, S. Baur, R. Bay, J. J. Beatty, K. -H. Becker, J. Becker Tjus, S. BenZvi, D. Berley, E. Bernardini, D. Z. Besson, G. Binder, D. Bindig, E. Blaufuss, S. Blot, C. Bohm, S. Boser, O. Botner, J. Bottcher, E. Bourbeau, J. Bourbeau, F. Bradascio, J. Braun, S. Bron, J. Brostean-Kaiser, A. Burgman, J. Buscher, R. S. Busse, T. Carver, C. Chen, E. Cheung, D. Chirkin, S. Choi, B. A. Clark, K. Clark, L. Classen, A. Coleman, G. H. Collin, J. M. Conrad, P. Coppin, P. Correa, D. F. Cowen, R. Cross, P. Dave, C. De Clercq, H. Dembinski, K. Deoskar, S. De Ridder, A. Desai, P. Desiati, K. D. de Vries, G. de Wasseige, M. de With, T. DeYoung, S. Dharani, A. Diaz, H. Dujmovic, M. Dunkman, E. Dvorak, T. Ehrhardt, P. Eller, R. Engel, P. A. Evenson, S. Fahey, A. R. Fazely, J. Felde, A. Fienberg, K. Filimonov, C. Finley, A. Franckowiak, E. Friedman, A. Fritz, T. K. Gaisser, J. Gallagher, E. Ganster, S. Garrappa, L. Gerhardt, T. Glauch, T. Glusenkamp, A. Goldschmidt, J. G. Gonzalez, D. Grant, Z. Griffith, S. Griswold, M. Gunder, M. Gunduz, C. Haack, A. Hallgren, R. Halliday, L. Halve, F. Halzen, K. Hanson, J. Hardin, A. Haungs, S. Hauser, D. Hebecker, D. Heereman, P. Heix, K. Helbing, R. Hellauer, F. Henningsen, S. Hickford, J. Hignight, C. Hill, G. C. Hill, K. D. Hoffman, R. Hoffmann, T. Hoinka, B. Hokanson-Fasig, K. Hoshina, F. Huang, M. Huber, T. Huber, K. Hultqvist, M. Hunnefeld, R. Hussain, S. In, N. Iovine, A. Ishihara, M. Jansson, G. S. Japaridze, M. Jeong, B. J. P. Jones, F. Jonske, R. Joppe, D. Kang, W. Kang, A. Kappes, D. Kappesser, T. Karg, M. Karl, A. Karle, U. Katz, M. Kauer, M. Kellermann, J. L. Kelley, A. Kheirandish, J. Kim, K. Kin, T. Kintscher, J. Kiryluk, T. Kittler, S. R. Klein, R. Koirala, H. Kolanoski, L. Kopke, C. Kopper, S. Kopper, D. J. Koskinen, P. Koundal, M. Kowalski, K. Krings, G. Kruckl, N. Kulacz, N. Kurahashi, A. Kyriacou, J. L. Lanfranchi, M. J. Larson, F. Lauber, J. P. Lazar, K. Leonard, A. Leszczynska, Y. Li, Q. R. Liu, E. Lohfink, C. J. Lozano Mariscal, L. Lu, F. Lucarelli, A. Ludwig, J. Lunemann, W. Luszczak, Y. Lyu, W. Y. Ma, J. Madsen, G. Maggi, K. B. M. Mahn, Y. Makino, P. Mallik, S. Mancina, I. C. Maris, R. Maruyama, K. Mase, R. Maunu, F. McNally, K. Meagher, M. Medici, A. Medina, M. Meier, S. Meighen-Berger, J. Merz, T. Meures, J. Micallef, D. Mockler, G. Momente, T. Montaruli, R. W. Moore, R. Morse, M. Moulai, P. Muth, R. Nagai, U. Naumann, G. Neer, L. V. Nguyen, H. Niederhausen, S. C. Nowicki, D. R. Nygren, A. Obertacke Pollmann, M. Oehler, A. Olivas, A. O'Murchadha, E. O'Sullivan, H. Pandya, D. V. Pankova, N. Park, G. K. Parker, E. N. Paudel, P. Peiffer, C. Perez de los Heros, S. Philippen, D. Pieloth, S. Pieper, E. Pinat, A. Pizzuto, M. Plum, Y. Popovych, A. Porcelli, M. Prado Rodriguez, P. B. Price, G. T. Przybylski, C. Raab, A. Raissi, M. Rameez, L. Rauch, K. Rawlins, I. C. Rea, A. Rehman, R. Reimann, B. Relethford, M. Renschler, G. Renzi, E. Resconi, W. Rhode, M. Richman, B. Riedel, S. Robertson, G. Roellinghoff, M. Rongen, C. Rott, T. Ruhe, D. Ryckbosch, D. Rysewyk Cantu, I. Safa, S. E. Sanchez Herrera, A. Sandrock, J. Sandroos, M. Santander, S. Sarkar, S. Sarkar, K. Satalecka, M. Scharf, M. Schaufel, H. Schieler, P. Schlunder, T. Schmidt, A. Schneider, J. Schneider, F. G. Schroder, L. Schumacher, S. Sclafani, D. Seckel, S. Seunarine, S. Shefali, M. Silva, B. Smithers, R. Snihur, J. Soedingrekso, D. Soldin, M. Song, G. M. Spiczak, C. Spiering, J. Stachurska, M. Stamatikos, T. Stanev, R. Stein, J. Stettner, A. Steuer, T. Stezelberger, R. G. Stokstad, N. L. Strotjohann, T. Sturwald, T. Stuttard, G. W. Sullivan, I. Taboada, F. Tenholt, S. Ter-Antonyan, A. Terliuk, S. Tilav, L. Tomankova, C. Tonnis, S. Toscano, D. Tosi, A. Trettin, M. Tselengidou, C. F. Tung, A. Turcati, R. Turcotte, B. Ty, E. Unger, M. A. Unland Elorrieta, M. Usner, J. Vandenbroucke, W. Van Driessche, D. van Eijk, N. van Eijndhoven, D. Vannerom, J. van Santen, S. Verpoest, M. Vraeghe, C. Walck, A. Wallace, M. Wallraff, T. B. Watson, C. Weaver, A. Weindl, M. J. Weiss, J. Weldert, C. Wendt, J. Werthebach, B. J. Whelan, N. Whitehorn, K. Wiebe, C. H. Wiebusch, D. R. Williams, L. Wills, M. Wolf, T. R. Wood, K. Woschnagg, G. Wrede, J. Wulff, X. W. Xu, Y. Xu, J. P. Yanez, S. Yoshida, T. Yuan, Z. Zhang, M. Zocklein

Summary: The HAWC and IceCube observatories have developed a multimessenger joint search for extragalactic astrophysical sources through the AMON framework. Results from archival data collected between 2015 and 2018 show two coincident events with a false-alarm rate of <1 coincidence yr(-1). Real-time implementation of the analysis began in 2019 and issues alerts with an FAR threshold of <4 coincidences yr(-1) through the Gamma-ray Coordinates Network.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

A Survey of Active Galaxies at TeV Photon Energies with the HAWC Gamma-Ray Observatory

A. Albert, C. Alvarez, J. R. Angeles Camacho, J. C. Arteaga-Velazquez, K. P. Arunbabu, D. Avila Rojas, H. A. Ayala Solares, V. Baghmanyan, E. Belmont-Moreno, S. Y. BenZvi, C. Brisbois, K. S. Caballero-Mora, T. Capistran, A. Carraminana, S. Casanova, U. Cotti, J. Cotzomi, S. Coutino de Leon, E. De la Fuente, B. L. Dingus, M. A. DuVernois, M. Durocher, J. C. Diaz-Velez, K. Engel, C. Espinoza, K. L. Fan, M. Fernandez Alonso, H. Fleischhack, N. Fraija, A. Galvan-Gamez, D. Garcia, J. A. Garcia-Gonzalez, F. Garfias, M. M. Gonzalez, J. A. Goodman, J. P. Harding, S. Hernandez, B. Hona, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, D. Kieda, G. J. Kunde, A. Lara, W. H. Lee, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, J. Lundeen, K. Malone, O. Martinez, I. Martinez-Castellanos, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafa, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, L. Olivera-Nieto, A. Peisker, E. G. Perez-Perez, C. D. Rho, D. Rosa-Gonzalez, E. Ruiz-Velasco, H. Salazar, F. Salesa Greus, A. Sandoval, M. Schneider, H. Schoorlemmer, A. J. Smith, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, F. Urena-Mena, L. Villasenor, T. Weisgarber, E. Willox, A. Zepeda, H. Zhou, C. de Leon

Summary: The HAWC Gamma-Ray Observatory continuously detects TeV photons and particles, with significant detections of persistent emission from Mkn 421 and Mkn 501. Marginal evidence was also found for three other known high-energy emitters and a collective emission from a set of 30 previously reported very high-energy sources.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

Evidence of 200 TeV Photons from HAWC J1825-134

A. Albert, R. Alfaro, C. Alvarez, J. R. Angeles Camacho, J. C. Arteaga-Velazquez, K. P. Arunbabu, D. Avila Rojas, H. A. Ayala Solares, V. Baghmanyan, E. Belmont-Moreno, S. Y. BenZvi, C. Brisbois, T. Capistran, A. Carraminana, S. Casanova, U. Cotti, J. Cotzomi, E. De la Fuente, R. Diaz Hernandez, B. L. Dingus, M. A. DuVernois, M. Durocher, J. C. Diaz-Velez, K. Engel, C. Espinoza, K. Fang, H. Fleischhack, N. Fraija, A. Galvan-Gamez, D. Garcia, J. A. Garcia-Gonzalez, F. Garfias, G. Giacinti, M. M. Gonzalez, J. A. Goodman, J. P. Harding, B. Hona, D. Huang, F. Hueyotl-Zahuantitla, P. Huntemeyer, A. Iriarte, A. Jardin-Blicq, V. Joshi, G. J. Kunde, A. Lara, W. H. Lee, H. Leon Vargas, J. T. Linnemann, A. L. Longinotti, G. Luis-Raya, J. Lundeen, K. Malone, V. Marandon, O. Martinez, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, E. Moreno, M. Mostafa, A. Nayerhoda, L. Nellen, M. Newbold, M. U. Nisa, R. Noriega-Papaqui, N. Omodei, A. Peisker, Y. Perez Araujo, E. G. Perez-Perez, C. D. Rho, D. Rosa-Gonzalez, H. Salazar, F. Salesa Greus, A. Sandoval, M. Schneider, F. Serna, R. W. Springer, K. Tollefson, I. Torres, R. Torres-Escobedo, F. Urena-Mena, L. Villasenor, E. Willox, H. Zhou, C. de Leon

Summary: The Earth is bombarded by ultrarelativistic particles known as cosmic rays, believed to have a Galactic origin. The HAWC observatory discovered a gamma-ray source, HAWC J1825-134, extending beyond 200 TeV, coincident with a giant molecular cloud with a high gas density of 700 protons/cm(-3). It is likely that cosmic rays accelerated to energies of several PeV colliding with the ambient gas produce the observed radiation.

ASTROPHYSICAL JOURNAL LETTERS (2021)

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Article Astronomy & Astrophysics

A study on performance boost of a 17 m class Cherenkov telescope with a SiPM-based camera

Cornelia Arcaro, Michele Doro, Julian Sitarek, Dominik Baack

Summary: In this report, the performance of replacing PMTs with SiPMs in a 3rd generation IACT array (using MAGIC as an example) is investigated using generalized simulations. It is found that the use of SiPMs can improve sensitivity by a factor of three at the current trigger threshold energy, and the stronger sensitivity of SiPMs in the red part of the spectrum does not affect the performance of IACTs, which is a source of background.

ASTROPARTICLE PHYSICS (2024)

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Article Astronomy & Astrophysics

Forecasts analysis on varying-a theories from gravitational wave standard sirens

L. R. Colaco, R. F. L. Holanda, Rafael C. Nunes, J. E. Gonzalez

Summary: Motivated by future gravitational wave observations, this study performs forecast analysis to constrain a possible time variation of the fine structure constant a. By considering mock data from standard sirens and current observations of strong gravitational lensing systems, it is found that future standard sirens observations can also play a significant role in the search for variations of a.

ASTROPARTICLE PHYSICS (2024)

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Article Astronomy & Astrophysics

Enabling kilonova science with Nancy Grace Roman Space Telescope

Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell, Mattia Bulla, Andrew Toivonen, Leo P. Singer, Antonella Palmese, E. Burns, Suvi Gezari, Mansi M. Kasliwal, R. Weizmann Kiendrebeogo, Ashish Mahabal, Takashi J. Moriya, Armin Rest, Dan Scolnic, Robert A. Simcoe, Jamie Soon, Robert Stein, Tony Travouillon

Summary: Binary neutron star mergers and neutron star-black hole mergers can be detected through gravitational waves and electromagnetic radiation. Discovering kilonovae will provide valuable insights into element nucleosynthesis and nuclear matter. The unique features of the Nancy Grace Roman Space Telescope allow for the detection of gravitational wave counterparts missed by optical telescopes.

ASTROPARTICLE PHYSICS (2024)

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Review Astronomy & Astrophysics

GRMHD study of accreting massive black hole binaries in astrophysical environment: A review

Federico Cattorini, Bruno Giacomazzo

Summary: This article presents recent numerical advances in the theoretical characterization of massive binary black hole (MBBH) mergers in astrophysical environments. These systems are significant sources of gravitational waves (GWs) and promising candidates for multimessenger astronomy. Coincident detection of GWs and electromagnetic (EM) signals from merging MBBHs is a leading area of study in contemporary astrophysics. The scarcity of strong predictions for EM signals before, during, and after merger poses a major challenge in observational efforts. To address this, significant theoretical work has focused on characterizing EM counterparts that accompany GW signals. Full general relativistic modeling using Einstein's field equations coupled with magnetohydrodynamics equations has been key in producing accurate EM predictions. This review explores numerical investigations into the astrophysical manifestations of MBBH mergers and their potentially observable EM signatures.

ASTROPARTICLE PHYSICS (2024)

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Article Astronomy & Astrophysics

Avoiding parameter fine-tuning in mass varying neutrino models of DE?

Michael Maziashvili, Vakhtang Tsintsabadze

Summary: Coupled models of quintessence are introduced to avoid or mitigate the parameter fine-tuning problem and also should avoid the fine-tuning problem related to the initial conditions. Coupled models can explain the timescale of the coincidence between dark energy and matter energy densities, as well as the transition of dark energy dominance. Studying the mass varying neutrino model of dark energy with inverse power-law potential helps to understand its naturalness.

ASTROPARTICLE PHYSICS (2024)

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