2025/01/08 by Maike Clausen, Ivelina Momcheva, Clausen, Maike +27 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
paper · pdf · doi:10.48550/arxiv.2501.04788
openalex publication_date 2025/01/08 · openalex created_date 2025/01/11 · openalex updated_date 2026/07/28
We present a study of the size growth of the red sequence between 0.510, whereas half-mass radii are derived from the F444W profiles together with the F277W-F444W color-M_*/L relation. We investigate the dependence of the ratio re, mass/re, light on redshift, stellar mass, and the wavelength used to measure re, light, also separating the sample into younger and older quiescent galaxies. Our data demonstrate that rest-frame infrared sizes accurately trace mass-weighted sizes while sizes measured at rest-frame optical wavelengths (0.5-0.7μm) are 0.1-0.2 dex larger, with only minor variations in redshift. We find that the average size of young quiescent galaxies agrees with that of old quiescent galaxies at intermediate masses, 10<log(M_*/M\odot)<11, within their respective uncertainties in all observed-frame half-light, rest-frame half-light and half-mass radius measurements. At face value, our results point to a combination of progenitor bias and minor mergers driving the size growth of intermediate-mass quiescent galaxies at 0.5