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We analyze the stellar populations of a sample of 62 massive (log Mstar/Msun> 10.7) galaxies in the redshift range 1 < z < 1.6, with the main goal ofinvestigating the role of recent quenching in the size growth of quiescentgalaxies. We demonstrate that our sample is not biased toward bright, compact,or young galaxies, and thus is representative of the overall quiescentpopulation. Our high signal-to-noise ratio Keck LRIS spectra probe therest-frame Balmer break region which contains important absorption linediagnostics of recent star formation activity. We obtain improved measures ofthe various stellar population parameters, including the star-formationtimescale tau, age and dust extinction, by fitting templates jointly to bothour spectroscopic and broad-band photometric data. We identify which quiescentgalaxies were recently quenched and backtrack their individual evolvingtrajectories on the UVJ color-color plane finding evidence for two distinctquenching routes. By using sizes measured in the previous paper of this series,we confirm that the largest galaxies are indeed among the youngest at a givenredshift. This is consistent with some contribution to the apparent growth fromrecent arrivals, an effect often called progenitor bias. However, we calculatethat recently-quenched objects can only be responsible for about half theincrease in average size of quiescent galaxies over a 1.5 Gyr period,corresponding to the redshift interval 1.25 < z < 2. The remainder of theobserved size evolution arises from a genuine growth of long-standing quiescentgalaxies.

astrophysical journal/the astrophysical journal

Stellar populations from spectroscopy of a large sample of quiescent  galaxies at z > 1: Measuring the contribution of progenitor bias to early  size growth