L Zanisi
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
Authors
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
Dr Annagrazia Puglisi annagrazia.puglisi@durham.ac.uk
Academic Visitor
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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