TY - JOUR
T1 - Keck-I mosfire spectroscopy of compact star-forming galaxies at z ≳ 2
T2 - High velocity dispersions in progenitors of compact quiescent galaxies
AU - Barro, Guillermo
AU - Trump, Jonathan R.
AU - Koo, David C.
AU - Dekel, Avishai
AU - Kassin, Susan A.
AU - Kocevski, Dale D.
AU - Faber, Sandra M.
AU - Van Der Wel, Arjen
AU - Guo, Yicheng
AU - Pérez-González, Pablo G.
AU - Toloba, Elisa
AU - Fang, Jerome J.
AU - Pacifici, Camilla
AU - Simons, Raymond
AU - Campbell, Randy D.
AU - Ceverino, Daniel
AU - Finkelstein, Steven L.
AU - Goodrich, Bob
AU - Kassis, Marc
AU - Koekemoer, Anton M.
AU - Konidaris, Nicholas P.
AU - Livermore, Rachael C.
AU - Lyke, James E.
AU - Mobasher, Bahram
AU - Nayyeri, Hooshang
AU - Peth, Michael
AU - Primack, Joel R.
AU - Rizzi, Luca
AU - Somerville, Rachel S.
AU - Wirth, Gregory D.
AU - Zolotov, Adi
N1 - Publisher Copyright:
© 2014. The American Astronomical Society. All rights reserved.
PY - 2014/11/10
Y1 - 2014/11/10
N2 - 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⊙ yr-1 and masses of log(M/M⊙) ∼10.8. Their high integrated gas velocity dispersions of σint km s-1, as measured from emission lines of Hα and [O III], and the resultant M ∗-σint relation and M ⋆-Mdyn all match well to those of compact quiescent galaxies at z ∼ 2, as measured from stellar absorption lines. Since log(M ∗/Mdyn) =-0.06 ± 0.2 dex, these compact SFGs appear to be dynamically relaxed and evolved, i.e., depleted in gas and dark matter (<13%), and present larger σint 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.
AB - 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⊙ yr-1 and masses of log(M/M⊙) ∼10.8. Their high integrated gas velocity dispersions of σint km s-1, as measured from emission lines of Hα and [O III], and the resultant M ∗-σint relation and M ⋆-Mdyn all match well to those of compact quiescent galaxies at z ∼ 2, as measured from stellar absorption lines. Since log(M ∗/Mdyn) =-0.06 ± 0.2 dex, these compact SFGs appear to be dynamically relaxed and evolved, i.e., depleted in gas and dark matter (<13%), and present larger σint 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.
KW - galaxies: high-redshift
KW - galaxies: photometry
KW - galaxies: starburst
UR - http://www.scopus.com/inward/record.url?scp=84908461784&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/795/2/145
DO - 10.1088/0004-637X/795/2/145
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AN - SCOPUS:84908461784
SN - 0004-637X
VL - 795
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 145
ER -