Article
Astronomy & Astrophysics
Vipin Kumar, S. Vig, V. S. Veena, S. Mohan, S. K. Ghosh, A. Tej, D. K. Ojha
Summary: The star-forming activity in the H ii region RCW 42 has been studied using observations at multiple wavebands. A large expanse of the H ii region, spanning 20 x 15 pc(2), has been identified, along with the estimation of average electron density and ionization fraction. An extended green object and several young stellar objects have also been detected in the region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Zhang, A. Zavagno, A. Lopez-Sepulcre, H. Liu, F. Louvet, M. Figueira, D. Russeil, Y. Wu, J. Yuan, T. G. S. Pillai
Summary: The study investigates the fragmentation at 0.025 pc scale of candidate HMSCs observed by ALMA, revealing no clear difference in the fragmentation between those impacted and those not impacted by HII regions. While HII regions seem to affect the spatial distribution of fragmented cores, both types of candidate HMSCs exhibit a thermal fragmentation with hierarchical features. The results suggest that HII regions may assist in the formation of dense structures in impacted candidate HMSCs.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Siju Zhang, Ke Wang, Tie Liu, Annie Zavagno, Mika Juvela, Hongli Liu, Anandmayee Tej, Amelia M. Stutz, Shanghuo Li, Leonardo Bronfman, Qizhou Zhang, Paul F. Goldsmith, Chang Won Lee, Enrique Vazquez-Semadeni, Ken'ichi Tatematsu, Wenyu Jiao, Fengwei Xu, Chao Wang, Jian-Wen Zhou
Summary: This study uses ALMA observations to investigate the formation of massive stars triggered by ionization feedback. The results suggest that radiation-driven implosion is responsible for the formation of embedded cores and protostars within the ionizing feedback-driven structure. Additionally, filamentary gas structures fuel mass towards the cores in the bright-rimmed cloud. These findings reveal the operation of the combined process of radiation-driven implosion and clump-fed process in this massive bright-rimmed cloud.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. Csengeri, F. Wyrowski, K. M. Menten, H. Wiesemeyer, R. Guesten, J. Stutzki, S. Heyminck, Y. Okada
Summary: Studying the abundance differences of OD and OH in high-mass star forming regions provides key information about the formation of water. The results show a slow decrease of OD abundance over time and a high deuterium fractionation in the cold envelopes.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Hong-Li Liu, Tie Liu, Neal J. Evans, Ke Wang, Guido Garay, Sheng-Li Qin, Shanghuo Li, Amelia Stutz, Paul F. Goldsmith, Sheng-Yuan Liu, Anandmayee Tej, Qizhou Zhang, Mika Juvela, Di Li, Jun-Zhi Wang, Leonardo Bronfman, Zhiyuan Ren, Yue-Fang Wu, Kee-Tae Kim, Chang Won Lee, Ken'ichi Tatematsu, Maria R. Cunningham, Xun-Chuan Liu, Jing-Wen Wu, Tomoya Hirota, Jeong-Eun Lee, Pak-Shing Li, Sung-Ju Kang, Diego Mardones, Isabelle Ristorcelli, Yong Zhang, Qiu-Yi Luo, L. Viktor Toth, Hee-weon Yi, Hyeong-Sik Yun, Ya-Ping Peng, Juan Li, Feng-Yao Zhu, Zhi-Qiang Shen, Tapas Baug, L. K. Dewangan, Eswaraiah Chakali, Rong Liu, Feng-Wei Xu, Yu Wang, Chao Zhang, Jinzeng Li, Jianwen Zhou, Mengyao Tang, Qiaowei Xue, Namitha Issac, Archana Soam, Rodrigo H. Alvarez-Gutierrez
Summary: This study identified 453 high-mass star-forming cores and compiled three catalogues, including cores enshrouding H/UC HII regions and hot molecular cores not associated with them, laying an important foundation for future research on early stages of high-mass star formation. The findings suggest that the duration of chemically rich high-mass protostellar cores is comparable to the lifetime of H/UC-HII regions, and non-thermal dynamical mechanisms dominate on the smaller scales of the H/UC-HII cores.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Chenoa D. Tremblay, Tyler L. Bourke, James A. Green, John M. Dickey, O. Ivy Wong, Tim J. Galvin
Summary: This study focuses on Hii regions towards the Vela Supernova Remnant, using low-frequency, wide-field continuum observations to identify and study Hii regions in our Galaxy. The properties of these regions, including their interactions with clouds, ages, dominant emission lines, distances, ionizing photon flux, and infrared luminosity limits, are discussed. The high-mass star forming region RCW 38 is used as a pilot study to demonstrate the effectiveness of the observational approach.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jian-Wen Zhou, Tie Liu, Neal J. Evans, Guido Garay, Paul F. Goldsmith, Gilberto C. Gomez, Enrique Vazquez-Semadeni, Hong-Li Liu, Amelia M. Stutz, Ke Wang, Mika Juvela, Jinhua He, Di Li, Leonardo Bronfman, Xunchuan Liu, Feng-Wei Xu, Anandmayee Tej, L. K. Dewangan, Shanghuo Li, Siju Zhang, Chao Zhang, Zhiyuan Ren, Ken'ichi Tatematsu, Pak Shing Li, Chang Won Lee, Tapas Baug, Sheng-Li Qin, Yuefang Wu, Yaping Peng, Yong Zhang, Rong Liu, Qiu-Yi Luo, Jixing Ge, Anindya Saha, Eswaraiah Chakali, Qizhou Zhang, Kee-Tae Kim, Isabelle Ristorcelli, Zhi-Qiang Shen, Jin-Zeng Li
Summary: It is found that hub-filament systems are common in proto-clusters and decrease with increasing dust temperature and luminosity-to-mass ratios, indicating the influence of stellar feedback. The study also reveals different velocity gradients for filaments of different lengths, suggesting the presence of inertial inflows and dominance of gravity at small scales. Self-similar hub-filament systems and filamentary accretion may play a key role in high-mass star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jian-Wen Zhou, Shanghuo Li, Hong-Li Liu, Yaping Peng, Siju Zhang, Feng-Wei Xu, Chao Zhang, Tie Liu, Jin-Zeng Li
Summary: This study investigates the formation of hub-filament structures in the W33 complex by analyzing the velocity structures and their correlations with column density. It is suggested that the hub-filament structures are triggered by cloud-cloud collisions, and the non-thermal motions in W33-blue may originate from gravitationally driven collapse. However, the large-scale velocity gradient in W33-blue is likely influenced by cloud-cloud collisions and feedback from active star formation, rather than filament-rooted longitudinal inflow.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Dan Beilis, Sara Beck, John Lacy
Summary: The study suggests that each UCHII region in W33 Main may hold multiple exciting stars, improving the view of the stellar population and determining the dynamical development of the proto-cluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Nicholas Larose, C. R. Kerton
Summary: In this study, we analyze the molecular cloud, H II region, and associated star clusters of BFS 10 using different observational data. The results suggest that BFS 10 has the potential to become a bipolar H II region based on the expansion rate and lifetime of the ionizing star. Furthermore, two distinct regions of young stellar objects are identified within the molecular cloud.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Antoine Verliat, Patrick Hennebelle, Marta Gonzalez, Yueh-Ning Lee, Sam Geen
Summary: This passage discusses the conditions for star and stellar cluster formation and the role of stellar feedback. The study found that protostellar outflows can reduce the star formation rate, while ionising radiation can expel remaining gas and reduce the mass of the cluster. Furthermore, outflows can increase the velocity dispersion of high density gas and affect the rotation of the cluster.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
L. A. Suad, J. A. Molina Lera, S. Cichowolski
Summary: This study analyzes the characteristics of the H I supershell GS 121-05-037 and its role in triggering star formation. By analyzing the H I 21-cm line and far-infrared emission distributions, it is found that GS 121-05-037 has an expanding structure and an open morphology, and is associated with 32 H II regions. The study concludes that the ionizing stars may have been created due to the expansion of the H I supershell.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Xiao-Lan Liu, Jin-Long Xu, Jun-Jie Wang, Nai-Ping Yu, Chuan-Peng Zhang, Nan Li, Guo-Yin Zhang
Summary: The study explores gas kinematics and physical properties in the W33 complex and its surrounding filaments. A new hub-filament system is identified within the W33 complex, with gas flows along the filaments likely leading to the clustering and formation of clumps. This research suggests a correlation between clump formation and star formation in the region.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Shyam H. Menon, Christoph Federrath, Mark R. Krumholz
Summary: We present 3D radiation-hydrodynamical simulations of star cluster formation and evolution in self-gravitating clouds that are optically thick to infrared photons. Using a novel RHD algorithm - VETTAM, we investigate the impact of IR radiation pressure on the star formation efficiency and the potential for driving dusty winds. Our results suggest that the commonly adopted simplifications of IR dust opacities lead to overestimation of the radiation force and that realistic opacities that consider the microphysics of dust show a very mild effect of IR radiation pressure on star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. S. Gusev, F. Sakhibov, O. Egorov, V. S. Kostiuk, E. Shimanovskaya
Summary: In this study, young unresolved stellar groupings associated with H ii regions were observed and analyzed based on spectroscopic, photometric and Hα spectrophotometric observations. The morphology of the stellar groupings and their relation with the associated Hα emission region were studied, and the ages and masses of 400 young stellar groupings were estimated using simple stellar population models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. Cassanelli, Calvin Leung, M. Rahman, K. Vanderlinde, J. Mena-Parra, S. Cary, Kiyoshi W. Masui, Jing Luo, H-H Lin, A. Bij, A. Gill, D. Baker, Kevin Bandura, S. Berger, P. J. Boyle, Charanjot Brar, S. Chatterjee, D. Cubranic, Matt Dobbs, E. Fonseca, D. C. Good, J. F. Kaczmarek, V. M. Kaspi, T. L. Landecker, A. E. Lanman, Dongzi Li, J. W. McKee, B. W. Meyers, D. Michilli, Arun Naidu, Cherry Ng, Chitrang Patel, Aaron B. Pearlman, U. L. Pen, Ziggy Pleunis, Brendan Quine, A. Renard, Pranav Sanghavi, K. M. Smith, Ingrid Stairs, Shriharsh P. Tendulkar
Summary: The Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB experiment has successfully detected fast radio bursts (FRBs) with the help of its sensitivity and wide field of view, but its low resolution hinders accurate localization to host galaxies. Very long baseline interferometry (VLBI) can provide a solution to this localization challenge for non-repeating events. By refurbishing a 10 m radio dish at the Algonquin Radio Observatory in Canada, a testbed for VLBI experiments with a resolution of approximately 30 mas has been developed. The system's performance and localization procedure have been validated using single pulses from the Crab pulsar, and the project has successfully detected a non-repeating FRB simultaneously observed in both the CHIME and the Algonquin 10 m telescope.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Cameron W. Trapp, Dusan Keres, Tsang Keung Chan, Ivanna Escala, Cameron Hummels, Philip F. Hopkins, Claude-Andre Faucher-Giguere, Norman Murray, Eliot Quataert, Andrew Wetzel
Summary: This study analyzes gas accretion in the vicinity of galaxies using the FIRE-2 cosmological zoom-in simulations. It finds that gas approaches the disc with low radial velocities and similar angular momentum to the gaseous disc edge, piling up near the edge and settling into full rotational support for star formation. The gas moves predominantly parallel to the disc and joins largely in the outskirts, with a brief period of more vertical trajectories before joining the disc. Within the disc, gas motion is complex, dominated by spiral arm induced oscillations and feedback.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Maren Cosens, Shelley A. Wright, Norman Murray, Lee Armus, Karin Sandstrom, Tuan Do, Kirsten Larson, Gregory Martinez, Sanchit Sabhlok, Andrey Vayner, James Wiley
Summary: In this study, we surveyed the central region of the nearby starburst galaxy IC 10 using the high spectral and spatial resolution Keck Cosmic Web Imager. The results show that the H II regions in IC 10 are expanding, likely driven by feedback, and warm gas pressure dominates the outward pressure. Additionally, evidence of outflows supported by stellar winds or champagne flows was found.
ASTROPHYSICAL JOURNAL
(2022)
Article
Multidisciplinary Sciences
F. Kirsten, B. Marcote, K. Nimmo, J. W. T. Hessels, M. Bhardwaj, S. P. Tendulkar, A. Keimpema, J. Yang, M. P. Snelders, P. Scholz, A. B. Pearlman, C. J. Law, W. M. Peters, M. Giroletti, Z. Paragi, C. Bassa, D. M. Hewitt, U. Bach, V Bezrukovs, M. Burgay, S. T. Buttaccio, J. E. Conway, A. Corongiu, R. Feiler, O. Forssen, M. P. Gawronski, R. Karuppusamy, M. A. Kharinov, M. Lindqvist, G. Maccaferri, A. Melnikov, O. S. Ould-Boukattine, A. Possenti, G. Surcis, N. Wang, J. Yuan, K. Aggarwal, R. Anna-Thomas, G. C. Bower, R. Blaauw, S. Burke-Spolaor, T. Cassanelli, T. E. Clarke, E. Fonseca, B. M. Gaensler, A. Gopinath, V. M. Kaspi, N. Kassim, T. J. W. Lazio, C. Leung, D. Z. Li, H. H. Lin, K. W. Masui, R. Mckinven, D. Michilli, A. G. Mikhailov, C. Ng, A. Orbidans, U. L. Pen, E. Petroff, M. Rahman, S. M. Ransom, K. Shin, K. M. Smith, I. H. Stairs, W. Vlemmings
Summary: The fast radio burst FRB 20200120E is reported to originate from a globular cluster in the galaxy M81, which challenges previous models that invoke young magnetars as the source of FRBs. Instead, it is proposed that FRB 20200120E may come from a highly magnetized neutron star formed through the collapse of a white dwarf or the merger of compact stars in a binary system.
Article
Astronomy & Astrophysics
K. Nimmo, J. W. T. Hessels, F. Kirsten, A. Keimpema, J. M. Cordes, M. P. Snelders, D. M. Hewitt, R. Karuppusamy, A. M. Archibald, V. Bezrukovs, M. Bhardwaj, R. Blaauw, S. T. Buttaccio, T. Cassanelli, J. E. Conway, A. Corongiu, R. Feiler, E. Fonseca, O. Forssen, M. Gawronski, M. Giroletti, M. A. Kharinov, C. Leung, M. Lindqvist, G. Maccaferri, B. Marcote, K. W. Masui, R. Mckinven, A. Melnikov, D. Michilli, A. G. Mikhailov, C. Ng, A. Orbidans, O. S. Ould-Boukattine, Z. Paragi, A. B. Pearlman, E. Petroff, M. Rahman, P. Scholz, K. Shin, K. M. Smith, I. H. Stairs, G. Surcis, S. P. Tendulkar, W. Vlemmings, N. Wang, J. Yang, J. P. Yuan
Summary: Recent observational measurements of the nearby fast radio burst FRB 20200120E connect these extreme extragalactic transients with studies of Galactic neutron stars. The observational results of FRB suggest that FRB 20200120E bridges the gap between known Galactic young pulsars and magnetars and the more distant extragalactic FRBs, indicating a common magnetically powered emission mechanism across various timescales and luminosities.
Article
Astronomy & Astrophysics
Kieran A. Cleary, Jowita Borowska, Patrick C. Breysse, Morgan Catha, Dongwoo T. Chung, Sarah E. Church, Clive Dickinson, Hans Kristian Eriksen, Marie Kristine Foss, Joshua Ott Gundersen, Stuart E. Harper, Andrew Harris, Richard Hobbs, Havard T. Ihle, Junhan Kim, Jonathon Kocz, James W. Lamb, Jonas G. S. Lunde, Hamsa Padmanabhan, Timothy J. Pearson, Liju Philip, Travis W. Powell, Maren Rasmussen, Anthony C. S. Readhead, Thomas J. Rennie, Marta B. Silva, Nils-Ole Stutzer, Bade D. Uzgil, Duncan J. Watts, Ingunn Kathrine Wehus, David P. Woody, Lilian Basoalto, J. Richard Bond, Delaney A. Dunne, Todd Gaier, Brandon Hensley, Laura C. Keating, Charles R. Lawrence, Norman Murray, Roberta Paladini, Rodrigo Reeves, Marco P. Viero, Risa H. Wechsler
Summary: The CO Mapping Array Project aims to trace the distribution and properties of galaxies using line intensity mapping of carbon monoxide (CO). Through observations using the Pathfinder instrument, which is sensitive to CO emissions, the researchers have obtained direct constraints on the clustering component of the CO power spectrum. These constraints significantly improve upon previous measurements.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Havard T. Ihle, Jowita Borowska, Kieran A. Cleary, Hans Kristian Eriksen, Marie K. Foss, Stuart E. Harper, Junhan Kim, Jonas G. S. Lunde, Liju Philip, Maren Rasmussen, Nils-Ole Stutzer, Bade D. Uzgil, Duncan J. Watts, Ingunn Kathrine Wehus, J. Richard Bond, Patrick C. Breysse, Morgan Catha, Sarah E. Church, Dongwoo T. Chung, Clive Dickinson, Delaney A. Dunne, Todd Gaier, Joshua Ott Gundersen, Andrew Harris, Richard Hobbs, James W. Lamb, Charles R. Lawrence, Norman Murray, Anthony C. S. Readhead, Hamsa Padmanabhan, Timothy J. Pearson, Thomas J. Rennie, David P. Woody
Summary: This article presents the power spectrum methodology used in the first-season COMAP analysis and evaluates the quality of the current data set. Using the Feed-Feed Pseudo-Cross-Spectrum (FPXS) method, the main results are derived, and both noise modeling errors and experimental systematics are taken into account. By applying effective transfer functions, the effects of instrumental beam smoothing and various filter operations are considered. The power spectra obtained in this way help identify a systematic error related to one of the scanning strategies and demonstrate that uncertainties integrate as expected. The FPXS method allows for the estimation of the clustering component of the CO(1-0) power spectrum.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Patrick C. Breysse, Dongwoo T. Chung, Kieran A. Cleary, Havard T. Ihle, Hamsa Padmanabhan, Marta B. Silva, J. Richard Bond, Jowita Borowska, Morgan Catha, Sarah E. Church, Delaney A. Dunne, Hans Kristian Eriksen, Marie Kristine Foss, Todd Gaier, Joshua Ott Gundersen, Andrew Harris, Richard Hobbs, Laura Keating, James W. Lamb, Charles R. Lawrence, Jonas G. S. Lunde, Norman Murray, Timothy J. Pearson, Liju Philip, Maren Rasmussen, Anthony C. S. Readhead, Thomas J. Rennie, Nils-Ole Stutzer, Marco P. Viero, Duncan J. Watts, Ingunn Kathrine Wehus, David P. Woody
Summary: COMAP-EoR is a project aimed at extending CO intensity mapping to the Epoch of Reionization. By adding instruments and a receiver, COMAP-EoR is able to map CO(1-0) and CO(2-1) at reionization redshifts, providing valuable insights into cosmic history.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Marie K. Foss, Havard T. Ihle, Jowita Borowska, Kieran A. Cleary, Hans Kristian Eriksen, Stuart E. Harper, Junhan Kim, James W. Lamb, Jonas G. S. Lunde, Liju Philip, Maren Rasmussen, Nils-Ole Stutzer, Bade D. Uzgil, Duncan J. Watts, Ingunn K. Wehus, David P. Woody, J. Richard Bond, Patrick C. Breysse, Morgan Catha, Sarah E. Church, Dongwoo T. Chung, Clive Dickinson, Delaney A. Dunne, Todd Gaier, Joshua Ott Gundersen, Andrew Harris, Richard Hobbs, Charles R. Lawrence, Norman Murray, Anthony C. S. Readhead, Hamsa Padmanabhan, Timothy J. Pearson, Thomas J. Rennie
Summary: We describe the analysis pipeline of the first-season CO Mapping Array Project (COMAP) that converts raw detector readouts to calibrated sky maps. This pipeline includes four main steps: gain calibration, filtering, data selection, and mapmaking. The resulting data set and maps are analyzed and evaluated in terms of data processing and observing efficiencies.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Manuel E. Aravena, Jason E. Austermann, Kaustuv Basu, Nicholas Battaglia, Benjamin Beringue, Frank Bertoldi, Frank C. Bigiel, J. Richard Bond, Patrick C. Breysse, Colton C. Broughton, Ricardo Bustos, Scott C. K. Chapman, Maude T. Charmetant, Steve K. E. Choi, Dongwoo T. F. Chung, Susan E. T. Clark, Nicholas F. Cothard, Abigail T. Crites, Ankur J. Dev, Kaela Douglas, Cody J. Duell, Rolando Duenner, Haruki Ebina, Jens M. Erler, Michel Fich, Laura M. Fissel, Simon A. Foreman, R. G. Freundt, Patricio A. Gallardo, Jiansong Gao, Pablo E. Garcia, Riccardo E. Giovanelli, Joseph E. P. Golec, Christopher E. Groppi, Martha P. Haynes, Douglas Henke, Brandon Hensley, Terry Herter, Ronan Higgins, Renee Hlozek, Anthony Huber, Zachary Huber, Johannes Hubmayr, Rebecca Jackson, Douglas C. Johnstone, Christos Karoumpis, Laura C. Keating, Eiichiro Komatsu, Yaqiong C. Li, Benjamin D. Magnelli, Brenda C. J. Matthews, Philip D. Mauskopf, Jeffrey J. McMahon, P. Daniel Meerburg, Joel W. Meyers, Vyoma D. Muralidhara, Norman W. Murray, Michael D. Niemack, Thomas Nikola, Yoko A. Okada, Roberto Puddu, Dominik A. Riechers, Erik Rosolowsky, Kayla Rossi, Kaja I. Rotermund, Anirban Roy, Sarah Sadavoy, Reinhold Schaaf, Peter Schilke, Douglas K. Scott, Robert R. Simon, Adrian K. J. Sinclair, Gregory R. M. Sivakoff, Gordon J. Stacey, Amelia M. Stutz, Juergen Stutzki, Mehrnoosh A. Tahani, Karun N. Thanjavur, Ralf A. Timmermann, Joel N. M. Ullom, Alexander R. van Engelen, Eve M. D. Vavagiakis, Michael R. Vissers, Jordan D. Wheeler, Simon D. M. White, Yijie Zhu, Bugao Zou
Summary: We provide an overview of the Prime-Cam direct-detection camera-spectrometer, which will be used on the Fred Young Submillimeter Telescope. It will enable detailed studies of various astrophysical questions.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Andrey Vayner, Nadia L. Zakamska, Sanchit Sabhlok, Shelley A. Wright, Lee Armus, Norman Murray, Gregory Walth, Yuzo Ishikawa
Summary: We present Keck Cosmic Web Imager (KCWI) observations of the circumgalactic medium (CGM) of two radio-loud quasar host galaxies at z = 2. We detect extended emission on 80-90 kpc scale in Ly alpha with CIV and HeII also detected out to 30-50 kpc. Kinematics of the emission lines are consistent with velocities seen in dark matter haloes and inflowing gas in hydrodynamical simulations. Combining the data with molecular gas observations and high-spatial resolution imaging, we find that the quasar host galaxies reside in proto-group environments and are undergoing mergers, gas accretion, and outflows, shaping the assembly and evolution of massive galaxies at cosmic noon.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sandip Roy, Xuejian Shen, Mariangela Lisanti, David Curtin, Norman Murray, Philip F. Hopkins
Summary: This study demonstrates that even a small fraction of dissipative dark matter can significantly impact galactic evolution. The simulations show that dark matter with standard model-like masses and couplings can cool to form a rotating dark disk and a prominent bulge in the central galaxy.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Caleb Lammers, Sam Hadden, Norman Murray
Summary: This study argues that the intra-system uniformity in planet sizes and orbital spacings is likely the result of the dynamical sculpting of initially overly packed planetary systems. The researchers demonstrate through simulations that collisions between planets naturally lead to intra-system uniformity, in quantitative agreement with observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Patrick C. Breysse, Simon Foreman, Laura C. Keating, Joel Meyers, Norman Murray
Summary: This paper explores the prospects of accessing the distribution of hydrogen deuteride (HD) using line-intensity mapping and discusses its observations during the epoch of reionization and cosmic dawn. The findings suggest that the signal from the epoch of reionization is the most promising but currently out of reach for existing projects. However, future improvements could detect reionization-era HD. The measurement of HD during cosmic dawn is challenging due to poorly matched facilities, but sustained future effort may achieve significant detection.
Article
Astronomy & Astrophysics
Jeff Shen, Gwendolyn M. Eadie, Norman Murray, Dennis Zaritsky, Joshua S. Speagle, Yuan-Sen Ting, Charlie Conroy, Phillip A. Cargile, Benjamin D. Johnson, Rohan P. Naidu, Jiwon Jesse Han
Summary: This paper uses a hierarchical Bayesian model to study the mass distribution of the Milky Way halo and infers the mass of the Galaxy using kinematic data. The results are in good agreement with other studies, but limitations in the model's ability to describe the data are found, leading to an accuracy of about 15% in mass estimates.
ASTROPHYSICAL JOURNAL
(2022)