Issue |
A&A
Volume 680, December 2023
|
|
---|---|---|
Article Number | A48 | |
Number of page(s) | 14 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202347470 | |
Published online | 12 December 2023 |
Galaxy cluster mass accretion rates from IllustrisTNG
1
Department of Astronomy and Physics, Saint Mary’s University, 923 Robie Street, Halifax, NS B3H3C3, Canada
e-mail: michele.pizzardo@smu.ca
2
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA
3
Dipartimento di Fisica, Università di Torino, via P. Giuria 1, 10125 Torino, Italy
4
Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Torino, via P. Giuria 1, 10125 Torino, Italy
Received:
14
July
2023
Accepted:
19
September
2023
We used simulated cluster member galaxies from the TNG300-1 run of the IllustrisTNG simulations to develop a technique for measuring the galaxy cluster mass accretion rate (MAR) that can be applied directly to observations. We analyzed 1318 IllustrisTNG clusters of galaxies with M200c > 1014 M⊙ and 0.01 ≤ z ≤ 1.04. The MAR we derived is the ratio between the mass of a spherical shell located in the infall region and the time for the infalling shell to accrete onto the virialized region of the cluster. At fixed redshift, an approximately one order of magnitude increase in M200c results in a comparable increase in MAR. At fixed mass, the MAR increases by a factor of approximately five from z = 0.01 to z = 1.04. The MAR estimates derived from the caustic technique are unbiased and lie within 20% of the MARs based on the true mass profiles. This agreement is crucial for observational derivation of the MAR. The IllustrisTNG results are also consistent with (i) previous merger tree approaches based on N-body dark matter only simulations and with (ii) previously determined MARs of real clusters based on the caustic method. Future spectroscopic and photometric surveys will provide MARs of enormous cluster samples with mass profiles derived from both spectroscopy and weak lensing. Combined with future larger volume hydrodynamical simulations that extend to higher redshift, the MAR promises important insights into the evolution of massive systems of galaxies.
Key words: galaxies: clusters: general / galaxies: kinematics and dynamics / methods: numerical
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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