TIMING the EVOLUTION of QUIESCENT and STAR-FORMING LOCAL GALAXIES

Camilla Pacifici, Sree Oh, Kyuseok Oh, Jaehyun Lee, Sukyoung K. Yi

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Constraining the star formation histories (SFHs) of individual galaxies is crucial for understanding the mechanisms that regulate their evolution. Here, we combine multi-wavelength (ultraviolet, optical, and infrared) measurements of a very large sample of galaxies (∼230,000) at z < 0.16, with physically motivated models of galaxy spectral energy distributions to extract constraints on galaxy physical parameters (such as stellar mass and star formation rate) as well as individual SFHs. In particular, we set constraints on the timescales in which galaxies form a certain percentage of their total stellar mass (namely, 10%, 50%, and 90%). The large statistics allows us to average such measurements over different populations of galaxies (quiescent and star-forming) and in narrow ranges of stellar mass. As in the downsizing scenario, we confirm that low-mass galaxies have more extended SFHs than high-mass galaxies. We also find that at the same observed stellar mass, galaxies that are now quiescent evolve more rapidly than galaxies that are currently still forming stars. This suggests that stellar mass is not the only driver of galaxy evolution, but plays along with other factors such as merger events and other environmental effects.

Original languageEnglish
Article number45
JournalAstrophysical Journal
Volume824
Issue number1
DOIs
Publication statusPublished - 2016 Jun 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'TIMING the EVOLUTION of QUIESCENT and STAR-FORMING LOCAL GALAXIES'. Together they form a unique fingerprint.

  • Cite this