Details

Autor(en) / Beteiligte

• Barro, Guillermo
• Trump, Jonathan R
• Koo, David C
• Dekel, Avishai
• Kassin, Susan A
• Kocevski, Dale D
• Faber, Sandra M
• van der Wel, Arjen
• Guo, Yicheng
• Perez-Gonzalez, Pablo G

Titel

KECK-I MOSFERE SPECTROSCOPY OF COMPACT STAR-FORMING GALAXIES AT z [gap] 2: HIGH VELOCITY DISPERSIONS IN PROGENITORS OF COMPACT QUIESCENT GALAXIES

Ist Teil von

• The Astrophysical journal, 2014-01, Vol.795 (2), p.1-12

Erscheinungsjahr

2014

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present Keck-I MOSFIRE near-infrared spectroscopy for a sample of 13 compact star-forming galaxies (SFGs) at redshift 2 [< or =, slant] z [< or =, slant] 2.5 with star formation rates of SFR ~ 100 M sub([middot in circle]) yr super(-1) and masses of log(M/M sub([middot in circle])) ~ 10.8. Their high integrated gas velocity dispersions of [sigma] sub(int) = 230 super(+41) sub(-30) km s super(-1), as measured from emission lines of H alpha and [OIII], and the resultant M sub([sstarf])-[sigma] sub(int) relation and M sub([sstarf])-M sub(dyn) all match well to those of compact quiescent galaxies at z ~ 2, as measured from stellar absorption lines. Since log(M sub([sstarf])/M sub(dyn)) = -0.06 + or - 0.2dex, these compact SFGs appear to be dynamically relaxed and evolved, i.e., depleted in gas and dark matter (<13 super(+17) sub(-13) %), and present larger [sigma] sub(int) than their non-compact SFG counterparts at the same epoch. Without infusion of external gas, depletion timescales are short, less than ~300 Myr. This discovery adds another link to our new dynamical chain of evidence that compact SFGs at z [gap] 2 are already losing gas to become the immediate progenitors of compact quiescent galaxies by z ~ 2.