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The size function of massive satellites from the R-e-R-h and M-star-M-h relations: constraining the role of environment

The size function of massive satellites from the R-e-R-h and M-star-M-h relations: constraining the role of environment
The size function of massive satellites from the R-e-R-h and M-star-M-h relations: constraining the role of environment
In previous work, we showed that a semi-empirical model in which galaxies in host dark matter haloes are assigned stellar masses via a stellar mass–halo mass (SMHM) relation and sizes (Re) via a linear and tight Re–Rh relation can faithfully reproduce the size function of local Sloan Digital Sky Survey (SDSS) central galaxies and the strong size evolution of massive galaxies (MGs; Mstar > 1011.2 M). In this third paper of the series, we focus on the population of satellite MGs. We find that without any additional calibration and irrespective of the exact SMHM relation, fraction of quenched galaxies, or level of stellar stripping, the same model is able to reproduce the local size function of quiescent satellite MGs in SDSS. In addition, the same model can reproduce the puzzling weak dependence of mean size on host halo mass for both central and satellite galaxies. The model also matches the size function of star-forming satellite MGs, after assuming that some of them transform into massive lenticulars in a few Gyr after infalling in the group/cluster environment. However, the vast majority of satellite lenticulars are predicted to form before infall. The Re–Rh relation appears to be fundamental to connect galaxies and their host haloes.
1365-2966
L84–L89
Zanisi, Lorenzo
87405729-1792-4919-a0de-fc92ea450edb
Shankar, F
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Bernardi, M.
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Mei, S.
c1740766-1315-4422-a6f4-3eecc76db20a
Huertas-Company, M.
0a864d45-6e9b-43cc-9db8-c25b0bb633ea
Zanisi, Lorenzo
87405729-1792-4919-a0de-fc92ea450edb
Shankar, F
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Bernardi, M.
54b8a017-8b86-4c7d-87b3-a2ebda0b4e56
Mei, S.
c1740766-1315-4422-a6f4-3eecc76db20a
Huertas-Company, M.
0a864d45-6e9b-43cc-9db8-c25b0bb633ea

Zanisi, Lorenzo, Shankar, F, Bernardi, M., Mei, S. and Huertas-Company, M. (2021) The size function of massive satellites from the R-e-R-h and M-star-M-h relations: constraining the role of environment. Monthly Notices of the Royal Astronomical Society, 505 (1), L84–L89. (doi:10.1093/mnrasl/slab056).

Record type: Article

Abstract

In previous work, we showed that a semi-empirical model in which galaxies in host dark matter haloes are assigned stellar masses via a stellar mass–halo mass (SMHM) relation and sizes (Re) via a linear and tight Re–Rh relation can faithfully reproduce the size function of local Sloan Digital Sky Survey (SDSS) central galaxies and the strong size evolution of massive galaxies (MGs; Mstar > 1011.2 M). In this third paper of the series, we focus on the population of satellite MGs. We find that without any additional calibration and irrespective of the exact SMHM relation, fraction of quenched galaxies, or level of stellar stripping, the same model is able to reproduce the local size function of quiescent satellite MGs in SDSS. In addition, the same model can reproduce the puzzling weak dependence of mean size on host halo mass for both central and satellite galaxies. The model also matches the size function of star-forming satellite MGs, after assuming that some of them transform into massive lenticulars in a few Gyr after infalling in the group/cluster environment. However, the vast majority of satellite lenticulars are predicted to form before infall. The Re–Rh relation appears to be fundamental to connect galaxies and their host haloes.

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2105.13363 - Accepted Manuscript
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Accepted/In Press date: 26 May 2021
e-pub ahead of print date: 31 May 2021
Published date: July 2021
Additional Information: arXiv:2105.13363

Identifiers

Local EPrints ID: 453219
URI: http://eprints.soton.ac.uk/id/eprint/453219
ISSN: 1365-2966
PURE UUID: 73058344-9b8a-4b23-9617-75ede9ca03ef

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Date deposited: 11 Jan 2022 17:39
Last modified: 03 Jul 2025 00:54

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Contributors

Author: Lorenzo Zanisi
Author: F Shankar
Author: M. Bernardi
Author: S. Mei
Author: M. Huertas-Company

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