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Title: | Numerical Simulations Challenged on the Prediction of Massive Subhalo Abundance in Galaxy Clusters: The Case of Abell 2142 | Authors: | Munari, Emiliano Grillo, C. DE LUCIA, GABRIELLA BIVIANO, ANDREA Annunziatella, M. BORGANI, STEFANO Lombardi, M. MERCURIO, AMATA Rosati, P. |
Issue Date: | 2016 | Journal: | THE ASTROPHYSICAL JOURNAL LETTERS | Number: | 827 | Issue: | 1 | First Page: | L5 | Abstract: | In this Letter we compare the abundance of the member galaxies of a rich, nearby (z = 0.09) galaxy cluster, Abell 2142, with that of halos of comparable virial mass extracted from sets of state-of-the-art numerical simulations, both collisionless at different resolutions and with the inclusion of baryonic physics in the form of cooling, star formation, and feedback by active galactic nuclei. We also use two semi-analytical models to account for the presence of orphan galaxies. The photometric and spectroscopic information, taken from the Sloan Digital Sky Survey Data Release 12 database, allows us to estimate the stellar velocity dispersion of member galaxies of Abell 2142. This quantity is used as proxy for the total mass of secure cluster members and is properly compared with that of subhalos in simulations. We find that simulated halos have a statistically significant (≳ 7 sigma confidence level) smaller amount of massive (circular velocity above 200 {km} {{{s}}}<SUP>-1</SUP>) subhalos, even before accounting for the possible incompleteness of observations. These results corroborate the findings from a recent strong lensing study of the Hubble Frontier Fields galaxy cluster MACS J0416 and suggest that the observed difference is already present at the level of dark matter (DM) subhalos and is not solved by introducing baryonic physics. A deeper understanding of this discrepancy between observations and simulations will provide valuable insights into the impact of the physical properties of DM particles and the effect of baryons on the formation and evolution of cosmological structures. | Acknowledgments: | E.M. thanks Susana Planelles and Giuseppe Murante for helpful discussions. E.M. and C.G. acknowledge support by VILLUM FONDEN Young Investigator Programme through grant No. 10123. We made use of the CINECA facility PICO, obtained thanks to a class C ISCRA grant. Financial support for this work was provided in part by the PRIN-INAF 2014 1.05.01.94.02. The Millennium Simulation databases and web application were constructed as part of the activities of the German Astrophysical Virtual Observatory (GAVO). | URI: | http://hdl.handle.net/20.500.12386/26284 | URL: | https://iopscience.iop.org/article/10.3847/2041-8205/827/1/L5 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8205/827/1/L5 | Bibcode ADS: | 2016ApJ...827L...5M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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