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The evolution of compact massive quiescent and star-forming galaxies derived from the Re–Rh and Mstar–Mh relations

Zanisi, L; Shankar, F; Fu, H; Rodriguez-Puebla, A; Avila-Reese, V; Faisst, A; Daddi, E; Boco, L; Lapi, A; Giavalisco, M; Saracco, P; Buitrago, F; Huertas-Company, M; Puglisi, A; Dekel, A

The evolution of compact massive quiescent and star-forming galaxies derived from the Re–Rh and Mstar–Mh relations Thumbnail


Authors

L Zanisi

F Shankar

H Fu

A Rodriguez-Puebla

V Avila-Reese

A Faisst

E Daddi

L Boco

A Lapi

M Giavalisco

P Saracco

F Buitrago

M Huertas-Company

A Dekel



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.

Citation

Zanisi, L., Shankar, F., Fu, H., Rodriguez-Puebla, A., Avila-Reese, V., Faisst, A., …Dekel, A. (2021). The evolution of compact massive quiescent and star-forming galaxies derived from the Re–Rh and Mstar–Mh relations. Monthly Notices of the Royal Astronomical Society, 505(3), 4555-4570. https://doi.org/10.1093/mnras/stab1472

Journal Article Type Article
Acceptance Date May 17, 2021
Online Publication Date May 22, 2021
Publication Date 2021-08
Deposit Date Nov 16, 2021
Publicly Available Date Nov 16, 2021
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 505
Issue 3
Pages 4555-4570
DOI https://doi.org/10.1093/mnras/stab1472

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