BibTex format
@article{Tudorache:2026:mnras/stag2074,
author = {Tudorache, MN and Peiris, HV and Thorp, S and Deger, S and Mortlock, DJ and Jagwani, G and Halder, A and Leistedt, B and Van, den Bussche B and Leja, J},
doi = {mnras/stag2074},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {<tt>pop-cosmos</tt> : Galaxy size evolution across structural and star-formation classifications in COSMOS-Web},
url = {http://dx.doi.org/10.1093/mnras/stag2074},
year = {2026}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - <jats:title>Abstract</jats:title> <jats:p>Galaxy sizes are correlated with stellar mass and redshift, as characterised by size scaling relations. The inferred forms of these scaling relations are sensitive to how galaxies are classified – either by their star formation activity (e.g. specific star-formation rate, sSFR) or by their morphology markers (e.g. bulge-to-total ratio, Sérsic index). We combine stellar mass and sSFR estimates from pop-cosmos (a generative model trained on COSMOS2020 Spitzer IRAC Ch. 1 < 26) with size and morphology measurements from COSMOS-Web, obtaining 99 369 galaxies. By investigating the size–mass and the size–redshift relations, we show that: (i) the sSFR/morphology splits give quantitatively different slopes, intercepts, and intrinsic scatter behaviour; (ii) intrinsic scatter depends on structural morphology but not on sSFR, which constrains the galaxy–halo connection; (iii) the quiescent and bulge-dominated size–mass relations both show double-power law breaks, but at different pivot masses, indicating that quenching and structural transformation occur on different time-scales; (iv) the morphology-dependent trends are only recoverable from space-based imaging. Further, the quiescent pivot mass M ~ 1010.7 M coincides with the mass scale at which the active galactic nuclei (AGN, infrared torus) bolometric luminosity fraction peaks in transitioning galaxies, while the bulge-dominated pivot mass M ~ 1011.1 M coincides with the halo mass at which AGN-driven baryonic redistribution peaks, which may trace the interval over which AGN feedback ramps from quenching onset to structural transformation.</jats:p>
AU - Tudorache,MN
AU - Peiris,HV
AU - Thorp,S
AU - Deger,S
AU - Mortlock,DJ
AU - Jagwani,G
AU - Halder,A
AU - Leistedt,B
AU - Van,den Bussche B
AU - Leja,J
DO - mnras/stag2074
PY - 2026///
SN - 0035-8711
TI - <tt>pop-cosmos</tt> : Galaxy size evolution across structural and star-formation classifications in COSMOS-Web
T2 - Monthly Notices of the Royal Astronomical Society
UR - http://dx.doi.org/10.1093/mnras/stag2074
UR - https://doi.org/10.1093/mnras/stag2074
ER -