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
A. D. Amaral, T. Vernstrom, B. M. Gaensler
Summary: Researchers conducted an analysis on the statistical characteristics of weak magnetic fields in the intergalactic medium, but did not detect a significant correlation signal. They determined model-dependent upper limits on the parallel magnetic field strength of filaments in the IGM, and noted that these results are consistent with previous findings.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
F. Levrier, J. Neveu, E. Falgarone, F. Boulanger, A. Bracco, T. Ghosh, F. Vansyngel
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
M. Roman, D. Hardin, M. Betoule, P. Astier, C. Balland, R. S. Ellis, S. Fabbro, J. Guy, I. Hook, D. A. Howell, C. Lidman, A. Mitra, A. Moeller, A. M. Mourao, J. Neveu, N. Palanque-Delabrouille, C. J. Pritchet, N. Regnault, V. Ruhlmann-Kleider, C. Saunders, M. Sullivan
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
C. Balland, F. Cellier-Holzem, C. Lidman, P. Astier, M. Betoule, R. G. Carlberg, A. Conley, R. S. Ellis, J. Guy, D. Hardin, I. M. Hook, D. A. Howell, R. Pain, C. J. Pritchet, N. Regnault, M. Sullivan, V. Arsenijevic, S. Baumont, P. El-Hage, S. Fabbro, D. Fouchez, A. Mitra, A. Moller, A. M. Mourao, J. Neveu, M. Roman, V. Ruhlmann-Kleider
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
F. Levrier, J. Neveu, E. Falgarone, F. Boulanger, A. Bracco, T. Ghosh, F. Vansyngel
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
M. Roman, D. Hardin, M. Betoule, P. Astier, C. Balland, R. S. Ellis, S. Fabbro, J. Guy, I. Hook, D. A. Howell, C. Lidman, A. Mitra, A. Moeller, A. M. Mourao, J. Neveu, N. Palanque-Delabrouille, C. J. Pritchet, N. Regnault, V. Ruhlmann-Kleider, C. Saunders, M. Sullivan
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
C. Balland, F. Cellier-Holzem, C. Lidman, P. Astier, M. Betoule, R. G. Carlberg, A. Conley, R. S. Ellis, J. Guy, D. Hardin, I. M. Hook, D. A. Howell, R. Pain, C. J. Pritchet, N. Regnault, M. Sullivan, V. Arsenijevic, S. Baumont, P. El-Hage, S. Fabbro, D. Fouchez, A. Mitra, A. Moller, A. M. Mourao, J. Neveu, M. Roman, V. Ruhlmann-Kleider
ASTRONOMY & ASTROPHYSICS
(2018)
Article
Astronomy & Astrophysics
C. Leloup, V Ruhlmann-Kleider, J. Neveu, A. de Mattia
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Anais Moller, Julien Peloton, Emille E. O. Ishida, Chris Arnault, Etienne Bachelet, Tristan Blaineau, Dominique Boutigny, Abhishek Chauhan, Emmanuel Gangler, Fabio Hernandez, Julius Hrivnac, Marco Leoni, Nicolas Leroy, Marc Moniez, Sacha Pateyron, Adrien Ramparison, Damien Turpin, Reza Ansari, Tarek Allam, Armelle Bajat, Biswajit Biswas, Alexandre Boucaud, Johan Bregeon, Jean-Eric Campagne, Johann Cohen-Tanugi, Alexis Coleiro, Damien Dornic, Dominique Fouchez, Olivier Godet, Philippe Gris, Sergey Karpov, Ada Nebot Gomez-Moran, Jeremy Neveu, Stephane Plaszczynski, Volodymyr Savchenko, Natalie Webb
Summary: FINK is a broker designed to support science with large time-domain alert streams, offering traditional broker features as well as real-time transient classification improved by advanced learning techniques. This tool aims to enhance the accuracy of scientific output from LSST photometric data and increase the frequency of new discoveries.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alain Blanchard, Eric Aubourg, Philippe Brax, Francisco J. Castander, Sandrine Codis, Stephanie Escoffier, Fabien Dournac, Agnes Ferte, Fabio Finelli, Pablo Fosalba, Emmanuel Gangler, Satya Gontcho A. Gontcho, Adam Hawken, Stephane Ilic, Jean-Paul Kneib, Martin Kunz, Guilhem Lavaux, Olivier Le Fevre, Julien Lesgourgues, Yannick Mellier, Jeremy Neveu, Yann Rasera, Cecile Renault, Marina Ricci, Ziad Sakr, Norma G. Sanchez, Isaac Tutusaus, Safir Yahia-Cherif
Summary: The concordance cosmological model is currently the most robust in describing the evolution and content of the Universe. Understanding this model requires mapping the observable Universe over cosmic time, with missions like LiteBIRD testing inflation and Euclid mapping dark energy. The GAUSS mission aims to fully map the cosmic web, addressing crucial degeneracies between various components of the Universe.
EXPERIMENTAL ASTRONOMY
(2021)
Article
Astronomy & Astrophysics
M. Moniez, J. Neveu, S. Dagoret-Campagne, Y. Gentet, L. Le Guillou
Summary: The paper presents the testing of a holographic optical element as an aberration-corrected grating for a telescope slitless spectrograph, showing promising results. The holographic disperser prototypes produce significantly better focused spectra compared to regular gratings, approaching theoretical performance in resolution. The roadmap for producing a competitive holographic element for the Vera Rubin Observatory auxiliary telescope has been established.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Plaszczynski, J. E. Campagne, J. Peloton, C. Arnault
Summary: Counting pairs of galaxies or stars according to their distance is the core of real-space correlation analyses in astrophysics and cosmology. This article introduces an efficient algorithm using Apache Spark framework and a new non-hierarchical sphere pixelization method called SARSPix to optimize distance-related computations. Through LSST-like simulations, pair-distance histograms can be constructed in a few minutes, demonstrating the potential of this new technique in the field of astronomy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Marc Betoule, Sarah Antier, Emmanuel Bertin, Pierre Eric Blanc, Sebastien Bongard, Johann Cohen Tanugi, Sylvie Dagoret-Campagne, Fabrice Feinstein, Delphine Hardin, Claire Juramy, Laurent Le Guillou, Auguste Le Van Suu, Marc Moniez, Jeremy Neveu, Eric Nuss, Bertrand Plez, Nicolas Regnault, Eduardo Sepulveda, Kelian Sommer, Thierry Souverin, Xiao Feng Wang
Summary: This study aims to establish a five-stage metrology chain from NIST photodiodes to stars, improving the link between existing astrophysical flux standards and laboratory standards. The calibration transfer from NIST photodiodes to a demonstration CMOS sensor was successfully achieved, providing full characterization of the camera. The results demonstrate high stability, homogeneity, and quantum efficiency of the camera, making it suitable for various astronomical imaging applications.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
C. Leloup, L. Heitz, J. Neveu
Summary: The DBI-Galileon model is a scalar-tensor theory of gravity with clear physical meaning parameters, but it exhibits fatal instability in the non-relativistic limit.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Nora Elisa Chisari, David Alonso, Elisabeth Krause, C. Danielle Leonard, Philip Bull, Jeremy Neveu, Antonio Villarreal, Sukhdeep Singh, Thomas McClintock, John Ellison, Zilong Du, Joe Zuntz, Alexander Mead, Shahab Joudaki, Christiane S. Lorenz, Tilman Troster, Javier Sanchez, Francois Lanusse, Mustapha Ishak, Renee Hlozek, Jonathan Blazek, Jean-Eric Campagne, Husni Almoubayyed, Tim Eifler, Matthew Kirby, David Kirkby, Stephane Plaszczynski, Anze Slosar, Michal Vrastil, Erika L. Wagoner
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2019)
Article
Astronomy & Astrophysics
J. -E. Campagne, S. Plaszczynski, J. Neveu
ASTROPHYSICAL JOURNAL
(2017)