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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 710198.0, MPI für Astronomie / Publikationen_mpia
Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z >~ 2: High velocity dispersions in progenitors of compact quiescent galaxies
Authors:Barro, G.; Trump, J. R.; Koo, D. C.; Dekel, A.; Kassin, S. A.; Kocevski, D. D.; Faber, S. M.; van der Wel, A.; Guo, Y.; Pérez-González, P. G.; Toloba, E.; Fang, J. J.; Pacifici, C.; Simons, R.; Campbell, R. D.; Ceverino, D.; Finkelstein, S. L.; Goodrich, B.; Kassis, M.; Koekemoer, A. M.; Konidaris, N. P.; Livermore, R. C.; Lyke, J. E.; Mobasher, B.; Nayyeri, H.; Peth, M.; Primack, J. R.; Rizzi, L.; Somerville, R. S.; Wirth, G. D.; Zolotov, A.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 145 (12 pp)
Audience:Not Specified
Abstract / Description:We present Keck-I MOSFIRE near-infrared spectroscopy for a sample of 13 compact star-forming galaxies (SFGs) at redshift 2 <= z <= 2.5 with star formation rates of SFR ~ 100 M &#9737; yr--1 and masses of log(M/M &#9737;) ~10.8. Their high integrated gas velocity dispersions of sigmaint =230+40-30 km s--1, as measured from emission lines of Halpha and [O III], and the resultant M sstarf-sigmaint relation and M sstarf-M dyn all match well to those of compact quiescent galaxies at z ~ 2, as measured from stellar absorption lines. Since log(M sstarf/M dyn) =--0.06 ± 0.2 dex, these compact SFGs appear to be dynamically relaxed and evolved, i.e., depleted in gas and dark matter (<13+17-13%), and present larger sigmaint 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 >~ 2 are already losing gas to become the immediate progenitors of compact quiescent galaxies by z ~ 2.
Free Keywords:galaxies: high-redshift; galaxies: photometry; galaxies: starburst
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/795/2/145
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