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Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z ≳ 2 : high velocity dispersions in progenitors of compact quiescent galaxies

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Abstract
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 similar to 100M(circle dot)yr(-1) and masses of log( M/M-circle dot) similar to 10.8. Their high integrated gas velocity dispersions of sigma(int) = 230(-30)(+40)km s(-1), as measured from emission lines of Ha and [O III], and the resultant M-star-sigma(int) relation and M-star-M-dyn all match well to those of compact quiescent galaxies at z similar to 2, as measured from stellar absorption lines. Since log( M-star/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(-13)(+17)%), and present larger sint than their non-compact SFG counterparts at the same epoch. Without infusion of external gas, depletion timescales are short, less than similar to 300 Myr. This discovery adds another link to our new dynamical chain of evidence that compact SFGs at z greater than or similar to 2 are already losing gas to become the immediate progenitors of compact quiescent galaxies by z similar to 2.
Keywords
EMISSION-LINE GALAXIES, INSIDE-OUT GROWTH, PASSIVELY EVOLVING GALAXIES, INTEGRAL FIELD SPECTROSCOPY, EXTRAGALACTIC LEGACY SURVEY, ACTIVE, GALACTIC NUCLEI, HIGH-REDSHIFT GALAXIES, INITIAL MASS FUNCTION, SUBMILLIMETER GALAXIES, MOLECULAR GAS, galaxies: high-redshift, galaxies: photometry, galaxies: starburst

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Citation

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Chicago
Barro, Guillermo, Jonathan R Trump, David C Koo, Avishai Dekel, Susan A Kassin, Dale D Kocevski, Sandra M Faber, et al. 2014. “Keck-I MOSFIRE Spectroscopy of Compact Star-forming Galaxies at z ≳ 2 : High Velocity Dispersions in Progenitors of Compact Quiescent Galaxies.” Astrophysical Journal 795 (2).
APA
Barro, Guillermo, Trump, J. R., Koo, D. C., Dekel, A., Kassin, S. A., Kocevski, D. D., Faber, S. M., et al. (2014). Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z ≳ 2 : high velocity dispersions in progenitors of compact quiescent galaxies. ASTROPHYSICAL JOURNAL, 795(2).
Vancouver
1.
Barro G, Trump JR, Koo DC, Dekel A, Kassin SA, Kocevski DD, et al. Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z ≳ 2 : high velocity dispersions in progenitors of compact quiescent galaxies. ASTROPHYSICAL JOURNAL. 2014;795(2).
MLA
Barro, Guillermo, Jonathan R Trump, David C Koo, et al. “Keck-I MOSFIRE Spectroscopy of Compact Star-forming Galaxies at z ≳ 2 : High Velocity Dispersions in Progenitors of Compact Quiescent Galaxies.” ASTROPHYSICAL JOURNAL 795.2 (2014): n. pag. Print.
@article{8567820,
  abstract     = {We present Keck-I MOSFIRE near-infrared spectroscopy for a sample of 13 compact star-forming galaxies (SFGs) at redshift 2 {\textlangle}= z {\textlangle}= 2.5 with star formation rates of SFR similar to 100M(circle dot)yr(-1) and masses of log( M/M-circle dot) similar to 10.8. Their high integrated gas velocity dispersions of sigma(int) = 230(-30)(+40)km s(-1), as measured from emission lines of Ha and [O III], and the resultant M-star-sigma(int) relation and M-star-M-dyn all match well to those of compact quiescent galaxies at z similar to 2, as measured from stellar absorption lines. Since log( M-star/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 ({\textlangle}13(-13)(+17)\%), and present larger sint than their non-compact SFG counterparts at the same epoch. Without infusion of external gas, depletion timescales are short, less than similar to 300 Myr. This discovery adds another link to our new dynamical chain of evidence that compact SFGs at z greater than or similar to 2 are already losing gas to become the immediate progenitors of compact quiescent galaxies by z similar to 2.},
  articleno    = {145},
  author       = {Barro, Guillermo and Trump, Jonathan R and Koo, David C and Dekel, Avishai and Kassin, Susan A and Kocevski, Dale D and Faber, Sandra M and van der Wel, Arjen and Guo, Yicheng and Perez-Gonzalez, Pablo G and Toloba, Elisa and Fang, Jerome J and Pacifici, Camilla and Simons, Raymond and Campbell, Randy D and Ceverino, Daniel and Finkelstein, Steven L and Goodrich, Bob and Kassis, Marc and Koekemoer, Anton M and Konidaris, Nicholas P and Livermore, Rachael C and Lyke, James E and Mobasher, Bahram and Nayyeri, Hooshang and Peth, Michael and Primack, Joel R and Rizzi, Luca and Somerville, Rachel S and Wirth, Gregory D and Zolotov, Adi},
  issn         = {0004-637X},
  journal      = {ASTROPHYSICAL JOURNAL},
  language     = {eng},
  number       = {2},
  pages        = {12},
  title        = {Keck-I MOSFIRE spectroscopy of compact star-forming galaxies at z \unmatched{2273} 2 : high velocity dispersions in progenitors of compact quiescent galaxies},
  url          = {http://dx.doi.org/10.1088/0004-637X/795/2/145},
  volume       = {795},
  year         = {2014},
}

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