Article
Astronomy & Astrophysics
William McDonald, Danail Obreschkow, Lilian Garratt-Smithson
Summary: This paper introduces a new dissociation index to compare the relationship between cold dark matter and gas in cosmic large-scale structures. The study finds that 90% of galaxy clusters have dark matter more elongated than gas, consistent with observations. Through simulations of colliding gaseous dark matter haloes, the details of dissociation process are further explored.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
G. A. Pena, G. N. Candlish
Summary: The late-time effect of primordial non-Gaussianity in the early Universe is studied in this work. By generating multiple realizations of cosmological structure and analyzing the matter power spectrum, bispectrum, and trispectrum, it is found that the initial non-Gaussianity has only a small imprint on the first three polyspectra. Some models show interesting scale-dependent deviations from the Gaussian case in the bispectrum and trispectrum, although the signal is at most at the per cent level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Nicolas Chartier, Benjamin D. Wandelt
Summary: The study proposes a new method to address the challenge of estimating the covariance matrix Sigma with a large number of simulations. By combining a small number of simulations with fast surrogates, the method obtains low-noise estimates of Sigma that are unbiased by construction. The numerical examples show significant variance reductions for different elements of the matter power spectrum covariance matrix using this method.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Eleni Tsaprazi, Jens Jasche, Ariel Goobar, Hiranya Peiris, Igor Andreoni, Michael W. Coughlin, Christoffer U. Fremling, Matthew J. Graham, Mansi Kasliwal, Shri R. Kulkarni, Ashish A. Mahabal, Reed Riddle, Jesper Sollerman, Anastasios Tzanidakis
Summary: The new generation of wide-field time-domain surveys has enabled the study of clustering of supernova host galaxies in the large-scale structure for the first time. The research found that supernovae exhibit high significance clustering and their distribution in the LSS is consistent with that of SDSS galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Cristhian Garcia, Camilo Santa, Antonio Enea Romano
Summary: This article introduces the use of convolutional neural networks to solve the inversion problem of the large-scale structure of the Universe. By observing the luminosity distance of Supernovae Ia, the researchers can reconstruct the large-scale structure. The results show that the velocity field inversion is more accurate than the density field.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Shang Li, Ji-Ping Dai, Xiu-Hui Tan, Yang-Jie Yan, Jun-Qing Xia
Summary: The bounce scenario in cosmology is a research topic that addresses the singularity problem and trans-Planckian issue left by the standard inflationary theory. In this work, the authors extend the analysis to large-scale structure measurements and find that the model parameters can be constrained effectively. The constraints become even stronger when combined with the measurements from the Planck satellite.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yuhao Li, Hong-Ming Zhu, Baojiu Li
Summary: Potential features in the primordial power spectrum have been searched for in recent galaxy surveys to understand inflation. The null detection so far suggests weak features, but next-generation surveys can provide stronger constraints. However, the non-linear regime and structure formation make it difficult to directly detect such features. Non-linear reconstruction can effectively retrieve damped features from halo catalogues, improving the accuracy of measurements assuming these features exist.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Martha Lippich, Ariel G. Sanchez
Summary: Minkowski functionals are statistical tools that characterize the geometry and topology of the cosmic density field. MEDUSA accurately estimates these functionals, with validation against known test samples showing excellent agreement with theory predictions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Marika Asgari, Indiarose Friswell, Mijin Yoon, Catherine Heymans, Andrej Dvornik, Benjamin Joachimi, Patrick Simon, Joe Zuntz
Summary: The study introduces a mitigation strategy to reduce the impact of non-linear galaxy bias on the joint cosmological analysis of weak lensing and galaxy surveys, utilizing Psi-statistic to minimize contributions from smallest physical scales and showing comparable constraining power to standard two-point galaxy clustering statistics. It demonstrates a significant decrease in bias on cosmological parameter S-8 when analyzing Psi-statistics compared to standard two-point correlation functions, highlighting the importance of moving towards new statistics less sensitive to smallest physical scales in 3 x 2pt analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Agustin M. Rodriguez-Medrano, Dante J. Paz, Federico A. Stasyszyn, Facundo Rodriguez, Andres N. Ruiz, Manuel Merchan
Summary: Research has shown that galaxies in cosmic voids exhibit delayed evolution compared to the rest of the Universe, indicating interactions between galaxies and their environment. The extent to which large-scale structures influence the properties of void galaxies, or if they are primarily influenced by the low local density typical of these regions, remains unclear. In this study, cosmic voids were identified in SDSS-DR16, and the g-r colour, star formation rate, and concentration of galaxies were examined. Results showed that galaxies in voids had bluer colours, higher star formation rates, and lower concentrations, particularly for haloes of a certain mass. Additionally, the properties of galaxies were found to be sensitive to the type of void they inhabited, suggesting a correlation between galaxy properties and the large-scale environment provided by voids.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sownak Bose, Boryana Hadzhiyska, Monica Barrera, Ana Maria Delgado, Fulvio Ferlito, Carlos Frenk, Cesar Hernandez-Aguayo, Lars Hernquist, Rahul Kannan, Ruediger Pakmor, Volker Springel, Simon D. M. White
Summary: Modern redshift surveys are mapping the distribution of galaxies on enormous distance scales. However, current hydrodynamical simulations cannot reach the volumes needed for upcoming surveys. A new, large volume hydrodynamical simulation called MillenniumTNG (MTNG) is able to accurately reproduce the observed clustering of galaxies, but there are discrepancies when separated by color. This is due to the quenching of satellite galaxies in the model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Celeste Artale, Markus Haider, Antonio D. Montero-Dorta, Mark Vogelsberger, Davide Martizzi, Paul Torrey, Simeon Bird, Lars Hernquist, Federico Marinacci
Summary: The study examines the distribution and evolution of seven ionized metals in different cosmic structures and gas phases in a cosmological simulation. It reveals different patterns in the distribution and evolution of ionized metals, offering a new perspective on baryon distribution and evolution across cosmic time and providing new clues to the missing baryons problem.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Louis Coates, Julian Adamek, Philip Bull, Caroline Guandalin, Chris Clarkson
Summary: The paper presents a suite of 53 fully relativistic simulations using the gevolution code, covering a wide range of cosmological observations. These simulations allow for statistical studies and calculation of derivatives of any relativistic observable with respect to cosmological parameters. As an example application, the cross-correlation between Doppler magnification and CDM + baryon density contrast is computed and studied.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Matteo Fasiello, Tomohiro Fujita, Zvonimir Vlah
Summary: In this paper, we provide exact analytic solutions for density and velocity fields in ACDM cosmology using Eulerian standard perturbation theory. The solutions are derived to all orders and have a separable form in time and momenta at each perturbative order.
Article
Astronomy & Astrophysics
Raul E. Angulo, Matteo Zennaro, Sergio Contreras, Giovanni Arico, Marcos Pellejero-Ibanez, Jens Stucker
Summary: The BACCO project presents a simulation framework designed for accurate predictions of mass, galaxies, and gas distribution based on cosmological parameters. The gravity-only simulations and cosmology-rescaling technique used in the project demonstrate high accuracy in predicting the non-linear mass power spectrum over a wide redshift range and scales. The emulator built for efficient interpolation of results shows promising accuracy levels, making predictions at the 2-3% level for various cosmological models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Vincenzi, M. Sullivan, A. Moeller, P. Armstrong, B. A. Bassett, D. Brout, D. Carollo, A. Carr, T. M. Davis, C. Frohmaier, L. Galbany, K. Glazebrook, O. Graur, L. Kelsey, R. Kessler, E. Kovacs, G. F. Lewis, C. Lidman, U. Malik, R. C. Nichol, B. Popovic, M. Sako, D. Scolnic, M. Smith, G. Taylor, B. E. Tucker, P. Wiseman, M. Aguena, S. Allam, J. Annis, J. Asorey, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, J. Carretero, F. J. Castander, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, S. Everett, I Ferrero, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, D. W. Gerdes, D. Gruen, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, M. Lima, M. A. G. Maia, J. L. Marshall, R. Miquel, R. Morgan, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, K. Reil, A. Roodman, E. Sanchez, M. Schubnell, S. Serrano, I Sevilla-Noarbe, E. Suchyta, G. Tarle, C. To, T. N. Varga, J. Weller, R. D. Wilkinson
Summary: Cosmological analyses of supernova samples need to consider contamination from different types of supernovae. By analyzing the Dark Energy Survey supernova sample, it is found that the contamination from non-Ia supernovae is between 0.8% and 3.5%, with a classification efficiency of 97.7% to 99.5%. The biases on the dark energy equation-of-state, w, are less than 0.008.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
T. Schmidt, T. Treu, S. Birrer, A. J. Shajib, C. Lemon, M. Millon, D. Sluse, A. Agnello, T. Anguita, M. W. Auger-Williams, R. G. McMahon, V Motta, P. Schechter, C. Spiniello, I Kayo, F. Courbin, S. Ertl, C. D. Fassnacht, J. A. Frieman, A. More, S. Schuldt, S. H. Suyu, M. Aguena, F. Andrade-Oliveira, J. Annis, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. Conselice, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, P. Doel, S. Everett, I Ferrero, D. Friedel, J. Garcia-Bellido, E. Gaztanaga, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, O. Lahav, F. Menanteau, R. Miquel, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, J. Prat, M. Rodriguez-Monroy, A. K. Romer, E. Sanchez, V Scarpine, I Sevilla-Noarbe, M. Smith, E. Suchyta, G. Tarle, C. To, T. N. Varga
Summary: Gravitational time delays provide an independent measurement method for H-0, and the key is to have high-accuracy lens models. In order to overcome the expense of obtaining these models, an automated modelling pipeline has been developed and applied to a sample of 31 lens systems. This pipeline can derive models with minimal human and computing time, providing measurements of key parameters and predictions of magnification and time delays for multiple images.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. Meldorf, A. Palmese, D. Brout, R. Chen, D. Scolnic, L. Kelsey, L. Galbany, W. G. Hartley, T. M. Davis, A. Drlica-Wagner, M. Vincenzi, J. Annis, M. Dixon, O. Graur, C. Lidman, A. Moller, P. Nugent, B. Rose, M. Smith, S. Allam, D. L. Tucker, J. Asorey, J. Calcino, D. Carollo, K. Glazebrook, G. F. Lewis, G. Taylor, B. E. Tucker, A. G. Kim, H. T. Diehl, M. Aguena, F. Andrade-Oliveira, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, J. Carretero, M. Carrasco Kind, F. J. Castander, M. Costanzi, L. N. da Costa, S. Desai, P. Doel, S. Everett, I Ferrero, D. Friedel, J. Frieman, J. Garcia-Bellido, M. Gatti, D. Gruen, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, M. March, J. L. Marshall, F. Menanteau, R. Miquel, R. Morgan, F. Paz-Chinchon, M. E. S. Pereira, A. A. Plazas Malagon, E. Sanchez, V Scarpine, I Sevilla-Noarbe, E. Suchyta, G. Tarle, T. N. Varga
Summary: Cosmological analyses with type Ia supernovae often overlook the varying dust properties in host galaxies, resulting in inaccurate conclusions. In this study, we use advanced modeling to characterize the dust parameters of 1100 Dark Energy Survey SN host galaxies and find that host dust has important impacts on SN cosmology, including a wide range of dust law slope R-V, lower R-V in high-stellar mass hosts compared to low-mass hosts, and a significant correlation between the Hubble diagram residuals of red SNe Ia and host R-V. These findings confirm recent predictions based on dust and provide insights into the "mass step" and intrinsic scatter in SN Ia analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Rongpu Zhou, Biprateep Dey, Jeffrey A. Newman, Daniel J. Eisenstein, K. Dawson, S. Bailey, A. Berti, J. Guy, Ting-Wen Lan, H. Zou, J. Aguilar, S. Ahlen, Shadab Alam, D. Brooks, A. de la Macorra, A. Dey, G. Dhungana, K. Fanning, A. Font-Ribera, S. Gontcho A. Gontcho, K. Honscheid, Mustapha Ishak, T. Kisner, A. Kovacs, A. Kremin, M. Landriau, Michael E. Levi, C. Magneville, Marc Manera, P. Martini, Aaron M. Meisner, R. Miquel, J. Moustakas, Adam D. Myers, Jundan Nie, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, F. Prada, A. Raichoor, A. J. Ross, E. Schlafly, D. Schlegel, M. Schubnell, Gregory Tarle, B. A. Weaver, R. H. Wechsler, Christophe Yeche, Zhimin Zhou
Summary: The Dark Energy Spectroscopic Instrument (DESI) is conducting a five-year survey to measure the redshifts of tens of millions of galaxies and quasars. The DESI LRG sample, selected using photometry data from the DESI Legacy Imaging Surveys, shows high robustness against imaging systematics. The sample has a higher density compared to previous surveys and has a high success rate in obtaining confident redshifts.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Adam D. Myers, John Moustakas, Stephen Bailey, Benjamin A. Weaver, Andrew P. Cooper, Jaime E. Forero-Romero, Bela Abolfathi, David M. Alexander, David Brooks, Edmond Chaussidon, Chia-Hsun Chuang, Kyle Dawson, Arjun Dey, Biprateep Dey, Govinda Dhungana, Peter Doel, Kevin Fanning, Enrique Gaztanaga, Satya Gontcho Gontcho, Alma X. Gonzalez-Morales, ChangHoon Hahn, Hiram K. Herrera-Alcantar, Klaus Honscheid, Mustapha Ishak, Tanveer Karim, David Kirkby, Theodore Kisner, Sergey E. Koposov, Anthony Kremin, Ting-Wen Lan, Martin Landriau, Dustin Lang, Michael E. Levi, Christophe Magneville, Lucas Napolitano, Paul Martini, Aaron Meisner, Jeffrey A. Newman, Nathalie Palanque-Delabrouille, Will Percival, Claire Poppett, Francisco Prada, Anand Raichoor, Ashley J. Ross, Edward F. Schlafly, David Schlegel, Michael Schubnell, Ting Tan, Gregory Tarle, Michael J. Wilson, Christophe Yeche, Rongpu Zhou, Zhimin Zhou, Hu Zou
Summary: In May 2021, the Dark Energy Spectroscopic Instrument (DESI) initiated a 5-year survey involving approximately 50 million extragalactic and Galactic targets. The primary targets of DESI include emission line galaxies, luminous red galaxies, and quasars. The survey is divided into dark-time targets and bright-time targets, with different targeting phases and identification systems. This paper provides an overview of the desitarget pipeline used for processing DESI targets, including the data model, structure, and access of DESI targeting files, as well as supporting target classes.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Joseph Harry Silber, Parker Fagrelius, Kevin Fanning, Michael Schubnell, Jessica Nicole Aguilar, Steven Ahlen, Jon Ameel, Otger Ballester, Charles Baltay, Chris Bebek, Dominic Benton Beard, Robert Besuner, Laia Cardiel-Sas, Ricard Casas, Francisco Javier Castander, Todd Claybaugh, Carl Dobson, Yutong Duan, Patrick Dunlop, Jerry Edelstein, William T. Emmet, Ann Elliott, Matthew Evatt, Irena Gershkovich, Julien Guy, Stu Harris, Henry Heetderks, Ian Heetderks, Klaus Honscheid, Jose Maria Illa, Patrick Jelinsky, Sharon R. Jelinsky, Jorge Jimenez, Armin Karcher, Stephen Kent, David Kirkby, Jean-Paul Kneib, Andrew Lambert, Mike Lampton, Daniela Leitner, Michael Levi, Jeremy McCauley, Aaron Meisner, Timothy N. Miller, Ramon Miquel, Julia Mundet, Claire Poppett, David Rabinowitz, Kevin Reil, David Roman, David Schlegel, Santiago Serrano, William Van Shourt, David Sprayberry, Gregory Tarle, Suk Sien Tie, Curtis Weaverdyck, Kai Zhang, Marco Azzaro, Stephen Bailey, Santiago Becerril, Tami Blackwell, Mohamed Bouri, David Brooks, Elizabeth Buckley-Geer, Jose Penate Castro, Mark Derwent, Arjun Dey, Govinda Dhungana, Peter Doel, Daniel J. Eisenstein, Nasib Fahim, Juan Garcia-Bellido, Enrique Gaztanaga, Satya Gontcho A. Gontcho, Gaston Gutierrez, Philipp Horler, Robert Kehoe, Theodore Kisner, Anthony Kremin, Luzius Kronig, Martin Landriau, Laurent Le Guillou, Paul Martini, John Moustakas, Nathalie Palanque-Delabrouille, Xiyan Peng, Will Percival, Francisco Prada, Carlos Allende Prieto, Guillermo Gonzalez de Rivera, Eusebio Sanchez, Justo Sanchez, Ray Sharples, Marcelle Soares-Santos, Edward Schlafly, Benjamin Alan Weaver, Zhimin Zhou, Yaling Zhu, Hu Zou
Summary: In 2019, a system of 5020 robotic fiber positioners was installed on the Mayall Telescope at Kitt Peak National Observatory. These robots automatically retarget their optical fibers every 10-20 minutes with high precision, enabling the Dark Energy Spectroscopic Instrument (DESI) to measure the spectra of 35 million galaxies and quasars. The system includes other components such as guide cameras, wave front cameras, fiducial point sources, and a metrology camera, and contains over 675,000 individual parts.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Xiyan Peng, Zhaoxiang Qi, Tianmeng Zhang, Zhenyu Wu, Zhimin Zhou, Jundan Nie, Hu Zou, Xiaohui Fan, Linhua Jiang, Ian McGreer, Jinyi Yang, Arjun Dey, Jun Ma, Jiali Wang, David Schlegel, Xu Zhou
Summary: We present the astrometric calibration of the Beijing-Arizona Sky Survey (BASS) tied to the International Celestial Reference Frame using Gaia Data Release 2. We corrected for stable effects like differential chromatic refraction and low CCD charge transfer efficiency at the raw image coordinates. Fourth-order polynomial corrections were applied to remove optical distortions. The systematic errors, dependent on color or magnitude, are less than 2 milliarcseconds (mas) when compared to the Gaia catalog.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
J. Guy, S. Bailey, A. Kremin, Shadab Alam, D. M. Alexander, C. Allende Prieto, S. BenZvi, A. S. Bolton, D. Brooks, E. Chaussidon, A. P. Cooper, K. Dawson, A. de la Macorra, A. Dey, Biprateep Dey, G. Dhungana, D. J. Eisenstein, A. Font-Ribera, J. E. Forero-Romero, E. Gaztanaga, S. Gontcho A. Gontcho, D. Green, K. Honscheid, M. Ishak, R. Kehoe, D. Kirkby, T. Kisner, Sergey E. Koposov, Ting-Wen Lan, M. Landriau, L. Le Guillou, Michael E. Levi, C. Magneville, Christopher J. Manser, P. Martini, Aaron M. Meisner, R. Miquel, J. Moustakas, Adam D. Myers, Jeffrey A. Newman, Jundan Nie, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, F. Prada, A. Raichoor, C. Ravoux, A. J. Ross, E. F. Schlafly, D. Schlegel, M. Schubnell, Ray M. Sharples, Gregory Tarle, B. A. Weaver, Christophe Yeche, Rongpu Zhou, Zhimin Zhou, H. Zou
Summary: The Dark Energy Spectroscopic Instrument (DESI) is a purpose-built instrument on the 4 m Mayall Telescope at Kitt Peak National Observatory for conducting a redshift survey. With a spectroscopic data processing pipeline, DESI generates wavelength- and flux-calibrated spectra, spectroscopic classifications, and redshift measurements. The pipeline has exceeded the project's requirements for redshift performance, achieving a purity greater than 99% for all target classes.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Duncan Farrah, Kevin S. Croker, Michael Zevin, Gregory Tarle, Valerio Faraoni, Sara Petty, Jose Afonso, Nicolas Fernandez, Kurtis A. Nishimura, Chris Pearson, Lingyu Wang, David L. Clements, Andreas Efstathiou, Evanthia Hatziminaoglou, Mark Lacy, Conor McPartland, Lura K. Pitchford, Nobuyuki Sakai, Joel Weiner
Summary: Observations have found black holes of varying masses throughout cosmic history, but the Kerr black hole solution is incomplete. Black hole models with realistic behavior predict that black holes can increase in mass with the expansion of the universe, independently of accretion or mergers. By studying supermassive black holes in elliptical galaxies, evidence is found for cosmologically coupled mass growth among these black holes, suggesting that black holes contribute as vacuum energy to the cosmological energy density.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
S. Kent, E. Neilsen, K. Honscheid, D. Rabinowitz, E. F. Schlafly, J. Guy, D. Schlegel, J. Garcia-Bellido, T. S. Li, E. Sanchez, J. Silber, J. Aguilar, S. Ahlen, D. Brooks, T. Claybaugh, A. de la Macorra, P. Doel, D. J. Eisenstein, K. Fanning, A. Font-Ribera, J. E. Forero-Romero, S. Gontcho A. Gontcho, J. Jimenez, D. Kirkby, T. Kisner, A. Kremin, M. Landriau, L. Le Guillou, M. E. Levi, C. Magneville, M. Manera, P. Martini, A. Meisner, R. Miquel, J. Moustakas, J. Nie, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, M. Rezaie, A. J. Ross, G. Rossi, M. Schubnell, H. Seo, Gregory Tarle, B. A. Weaver, R. Zhou, Z. Zhou, H. Zou
Summary: The Dark Energy Spectroscopic Instrument is conducting a survey to measure the spectra of 40 million galaxies and quasars and create the largest 3D map of the universe. Its main goal is to study the expansion history of the universe and the evolution of dark energy using baryon acoustic oscillations.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
William Sheu, Xiaosheng Huang, Aleksandar Cikota, Nao Suzuki, David J. Schlegel, Christopher Storfer
Summary: The introduction of deep wide-field surveys and machine-learning techniques has led to the discoveries of thousands of strong gravitational lensing systems and candidates. However, finding multiply-lensed transients remains rare. In this paper, we present a targeted lensed transient search pipeline and report the discovery of seven new lensed supernova candidates, including a highly likely Type Ia supernova in a system with an Einstein radius of about 1.5.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Aleksandar Cikota, Ivonne Toro Bertolla, Xiaosheng Huang, Saul Baltasar, Nicolas Ratier-Werbin, William Sheu, Christopher Storfer, Nao Suzuki, David J. Schlegel, Regis Cartier, Simon Torres, Stefan Cikota, Eric Jullo
Summary: Gravitational lensing allows us to determine galaxy mass profiles and cosmological parameters. We studied the strong lensing system DESI-253.2534+26.8843 and confirmed its lensing nature through spectroscopic observations and lens modeling. This system consists of a massive elliptical galaxy and four blue images forming an Einstein Cross pattern.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
C. Dawes, C. Storfer, X. Huang, G. Aldering, Aleksandar Cikota, Arjun Dey, D. J. Schlegel
Summary: Utilizing the time delay between multiple images of strongly lensed quasars can help measure the Hubble constant accurately. In this study, we searched for new candidate objects in the DESI Legacy Imaging Surveys and found 436 new multiply lensed and binary quasar candidates, with 65 candidates having redshifts from Sloan Digital Sky Survey Data Release 16.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
Edward F. Schlafly, David Kirkby, David J. Schlegel, Adam D. Myers, Anand Raichoor, Kyle Dawson, Jessica Aguilar, Carlos Allende Prieto, Stephen Bailey, Segev Benzvi, Jose Bermejo-Climent, David Brooks, Axel de la Macorra, Arjun Dey, Peter Doel, Kevin Fanning, Andreu Font-Ribera, Jaime E. Forero-Romero, Juan Garcia-Bellido, Satya Gontcho A. Gontcho, Julien Guy, ChangHoon Hahn, Klaus Honscheid, Mustapha Ishak, Stephanie Juneau, Robert Kehoe, Theodore Kisner, Anthony Kremin, Martin Landriau, Dustin A. Lang, James Lasker, Michael E. Levi, Christophe Magneville, Christopher J. Manser, Paul Martini, Aaron M. Meisner, Ramon Miquel, John Moustakas, Jeffrey A. Newman, Jundan Nie, Nathalie. Palanque-Delabrouille, Will J. Percival, Claire Poppett, Constance Rockosi, Ashley J. Ross, Graziano Rossi, Gregory Tarle, Benjamin A. Weaver, Christophe Yeche, Rongpu Zhou
Summary: This article presents the spectroscopic survey of galaxies by the Dark Energy Spectroscopic Instrument (DESI) and describes the observation processes. The survey's performance is compared with historical expectations, showing good agreement. Simulations also demonstrate good agreement with actual observations.
ASTRONOMICAL JOURNAL
(2023)
