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The evolution of compact massive quiescent and star-forming galaxies derived from the Re-Rhand Mstar-Mhrelations

The evolution of compact massive quiescent and star-forming galaxies derived from the Re-Rhand Mstar-Mhrelations
The evolution of compact massive quiescent and star-forming galaxies derived from the Re-Rhand Mstar-Mhrelations
The mean size (effective radius Re) of massive galaxies (MGs; Mstar > 1011.2M⊙) is observed to increase steadily with cosmic time. It is still unclear whether this trend originates from the size growth of individual galaxies (via, e.g. mergers and/or AGN feedback) or from the inclusion of larger galaxies entering the selection at later epochs (progenitor bias). We here build a data-driven, flexible theoretical framework to probe the structural evolution of MGs. We assign galaxies to dark matter haloes via stellar mass–halo mass (SMHM) relations with varying high-mass slopes and scatters σSMHM in stellar mass at fixed halo mass, and assign sizes to galaxies using an empirically motivated, constant and linear relationship between Re and the host dark matter halo radius Rh. We find that (1) the fast mean size growth of MGs is well reproduced independently of the shape of the input SMHM relation; (2) the numbers of compact MGs grow steadily until z ≳ 2 and fall off at lower redshifts, suggesting a lesser role of progenitor bias at later epochs; (3) a time-independent scatter σSMHM is consistent with a scenario in which compact star-forming MGs transition into quiescent MGs in a few 108 yr with a negligible structural evolution during the compact phase, while a scatter increasing at high redshift implies significant size growth during the star-forming phase. A robust measurement of the size function of MGs at high redshift can set strong constraints on the scatter of the SMHM relation and, by extension, on models of galaxy evolution.
galaxies: Abundances, galaxies: Fundamental parameters, galaxies: High-redshift, galaxies: Star formation
0035-8711
4555–4570
Zanisi, Lorenzo
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Shankar, F
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Fu, H.
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Rodriguez-Puebla, Aldo
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Avila-Reese, V.
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Faisst, A.
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Daddi, E.
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Boco, L.
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Lapi, A.
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Giavalisco, M.
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Saracco, P.
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Buitrago, Fernando
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Huertas-Company, M.
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Puglisi, A.
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Dekel, A.
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Zanisi, Lorenzo
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Shankar, F
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Fu, H.
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Rodriguez-Puebla, Aldo
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Avila-Reese, V.
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Faisst, A.
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Daddi, E.
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Boco, L.
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Lapi, A.
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Giavalisco, M.
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Saracco, P.
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Buitrago, Fernando
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Huertas-Company, M.
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Puglisi, A.
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Dekel, A.
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Zanisi, Lorenzo, Shankar, F, Fu, H., Rodriguez-Puebla, Aldo, Avila-Reese, V., Faisst, A., Daddi, E., Boco, L., Lapi, A., Giavalisco, M., Saracco, P., Buitrago, Fernando, Huertas-Company, M., Puglisi, A. and Dekel, A. (2021) The evolution of compact massive quiescent and star-forming galaxies derived from the Re-Rhand Mstar-Mhrelations. Monthly Notices of the Royal Astronomical Society, 505 (3), 4555–4570. (doi:10.1093/mnras/stab1472).

Record type: Article

Abstract

The mean size (effective radius Re) of massive galaxies (MGs; Mstar > 1011.2M⊙) is observed to increase steadily with cosmic time. It is still unclear whether this trend originates from the size growth of individual galaxies (via, e.g. mergers and/or AGN feedback) or from the inclusion of larger galaxies entering the selection at later epochs (progenitor bias). We here build a data-driven, flexible theoretical framework to probe the structural evolution of MGs. We assign galaxies to dark matter haloes via stellar mass–halo mass (SMHM) relations with varying high-mass slopes and scatters σSMHM in stellar mass at fixed halo mass, and assign sizes to galaxies using an empirically motivated, constant and linear relationship between Re and the host dark matter halo radius Rh. We find that (1) the fast mean size growth of MGs is well reproduced independently of the shape of the input SMHM relation; (2) the numbers of compact MGs grow steadily until z ≳ 2 and fall off at lower redshifts, suggesting a lesser role of progenitor bias at later epochs; (3) a time-independent scatter σSMHM is consistent with a scenario in which compact star-forming MGs transition into quiescent MGs in a few 108 yr with a negligible structural evolution during the compact phase, while a scatter increasing at high redshift implies significant size growth during the star-forming phase. A robust measurement of the size function of MGs at high redshift can set strong constraints on the scatter of the SMHM relation and, by extension, on models of galaxy evolution.

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The evolution of compact massive quiescent and star-forming galaxies derived from the Re-Rhand Mstar-Mhrelations - Accepted Manuscript
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Accepted/In Press date: 17 May 2021
Published date: 22 May 2021
Additional Information: arxiv is am
Keywords: galaxies: Abundances, galaxies: Fundamental parameters, galaxies: High-redshift, galaxies: Star formation

Identifiers

Local EPrints ID: 450939
URI: http://eprints.soton.ac.uk/id/eprint/450939
ISSN: 0035-8711
PURE UUID: 892eeb89-536a-49d9-a5c6-f912b4487ef0

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Date deposited: 25 Aug 2021 16:31
Last modified: 25 Nov 2021 18:46

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Contributors

Author: Lorenzo Zanisi
Author: F Shankar
Author: H. Fu
Author: Aldo Rodriguez-Puebla
Author: V. Avila-Reese
Author: A. Faisst
Author: E. Daddi
Author: L. Boco
Author: A. Lapi
Author: M. Giavalisco
Author: P. Saracco
Author: Fernando Buitrago
Author: M. Huertas-Company
Author: A. Puglisi
Author: A. Dekel

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