CAUGHT IN THE ACT: GAS AND STELLAR VELOCITY DISPERSIONS IN A FAST QUENCHING COMPACT STAR-FORMING GALAXY AT z ∼ 1.7

被引：36

作者：

Barro, Guillermo ^{[1
]}

Faber, Sandra M. ^{[1
]}

Dekel, Avishai ^{[2
]}

Pacifici, Camilla ^{[3
]}

Perez-Gonzalez, Pablo G. ^{[4
]}

Toloba, Elisa ^{[1
]}

Koo, David C. ^{[1
]}

Trump, Jonathan R. ^{[5
]}

Inoue, Shigeki ^{[2
]}

Guo, Yicheng ^{[1
]}

Liu, Fengshan ^{[6
]}

Primack, Joel R. ^{[7
]}

Koekemoer, Anton M. ^{[8
]}

Brammer, Gabriel ^{[8
]}

Cava, Antonio ^{[9
]}

Cardiel, Nicolas ^{[4
]}

Ceverino, Daniel ^{[10
]}

Eliche, Carmen ^{[4
]}

Fang, Jerome J. ^{[1
]}

Finkelstein, Steven L. ^{[11
]}

Kocevski, Dale D. ^{[12
]}

Livermore, Rachael C. ^{[11
]}

McGrath, Elizabeth ^{[12
]}

机构：

[1] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[2] Hebrew Univ Jerusalem, Jerusalem, Israel

[3] Yonsei Univ Observ, Yonsei, South Korea

[4] Univ Complutense Madrid, E-28040 Madrid, Spain

[5] Penn State Univ, University Pk, PA 16802 USA

[6] Shenyang Normal Univ, Shenyang, Peoples R China

[7] Santa Cruz Inst Particle Phys, Santa Cruz, CA USA

[8] Space Telescope Sci Inst, Baltimore, MD USA

[9] Observ Geneva, Geneva, Switzerland

[10] CSIC INTA, Ctr Astrobiol, Madrid, Spain

[11] Univ Texas Austin, Austin, TX 78712 USA

[12] Colby Coll, Waterville, ME 04901 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 820卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: high-redshift; galaxies: photometry; GREATER-THAN; 1; POST-STARBURST GALAXIES; HUBBLE-SPACE-TELESCOPE; ABSORPTION-LINE SPECTROSCOPY; PASSIVELY EVOLVING GALAXIES; EXTRAGALACTIC LEGACY SURVEY; NEAR-INFRARED SPECTROSCOPY; K-SELECTED GALAXIES; INSIDE-OUT GROWTH; QUIESCENT GALAXIES;

D O I：

10.3847/0004-637X/820/2/120

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Keck I MOSFIRE spectroscopy in the Y and H bands of GDN-8231, a massive, compact, star-forming galaxy at a redshift of z similar to 1.7. Its spectrum reveals both H alpha and [N II]. emission lines and strong Balmer absorption lines. The Ha. and Spitzer MIPS. 24 mu m fluxes are both weak, thus indicating a low star-formation rate of SFR less than or similar to 5-10 M-circle dot yr(-1). This, added to a relatively young age of similar to 700 Myr measured from the absorption lines, provides the first direct evidence for a distant galaxy being caught in the act of rapidly shutting down its star formation. Such quenching allows GDN-8231 to become a compact, quiescent galaxy, similar to three. other galaxies in our sample, by z similar to 1.5. Moreover, the color profile of GDN-8231 shows a bluer center, consistent with the predictions of recent simulations for an early phase of inside-out quenching. Its line-of-sight velocity dispersion for the gas, gas sigma(gas)(LOS) = 127 +/- 32 km s(-1), is nearly 40% smaller than that of its stars, sigma(LOS*) = 215 +/- 35 km s(-1). High-resolution hydro-simulations of galaxies explain such apparently colder gas kinematics of up to a factor of similar to 1.5 with rotating disks being viewed at different inclinations and/or centrally concentrated star-forming regions. A clear prediction is that their compact, quiescent descendants preserve some remnant rotation from their starforming progenitors.

引用

页数：16

共 41 条

[41] ALMA constraints on star-forming gas in a prototypical z=1.5 clumpy galaxy: the dearth of CO(5-4) emission from UV-bright clumps
Cibinel, A.
Daddi, E.
Bournaud, F.
Sargent, M. T.
le Floc'h, E.
Magdis, G. E.
Pannella, M.
Rujopakarn, W.
Juneau, S.
Zanella, A.
Duc, P. -A.
Oesch, P. A.
Elbaz, D.
Jagannathan, P.
Nyland, K.
Wang, T.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 469 (04) : 4683 - 4704

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