Spatially Resolved Stellar Kinematics from LEGA-C: Increased Rotational Support in z ∼ 0.8 Quiscent Galaxies

被引：57

作者：

Bezanson, Rachel ^{[1
,2
,3
]}

van der Wel, Arjen ^{[4
,5
]}

Pacifici, Camilla ^{[6
]}

Noeske, Kai ^{[5
]}

Barisic, Ivana ^{[5
]}

Bell, Eric F. ^{[7
]}

Brammer, Gabriel B. ^{[6
]}

Calhau, Joao ^{[8
]}

Chauke, Priscilla ^{[5
]}

van Dokkums, Pieter ^{[9
]}

Franx, Marijn ^{[10
]}

Gallazzi, Anna ^{[11
]}

van Houdt, Josha ^{[5
]}

Labbe, Ivo ^{[10
]}

Maseda, Michael V. ^{[10
]}

Carlos Munos-Mateos, Juan ^{[12
]}

Muzzin, Adam ^{[13
]}

van de Sande, Jesse ^{[14
]}

Sobra, David ^{[8
,10
]}

Straatman, Caroline ^{[4
]}

Wu, Po-Feng ^{[5
]}

机构：

[1] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

[2] Univ Pittsburgh, PITT PACC, Pittsburgh, PA 15260 USA

[3] Princeton Univ, Dept Astrophys, Princeton, NJ 08544 USA

[4] Univ Ghent, Sterrenkundig Observ, Krijgslaan 281 S9, B-9000 Ghent, Belgium

[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[6] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[7] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

[8] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

[9] Yale Univ, Astron Dept, New Haven, CT 06511 USA

[10] Leiden Univ, Leiden Observ, POB 9513, NL-2300 AA Leiden, Netherlands

[11] INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy

[12] European Southern Observ, Alonso Crdova 3107,Casilla 19001, Santiago, Chile

[13] York Univ, Dept Phys & Astron, 4700 Keele St, Toronto, ON MJ3 1P3, Canada

[14] Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 858卷 / 01期

基金：

欧洲研究理事会;

关键词：

galaxies; elliptical and lenticular; cD; -; evolution; high-redshift; kinematics and dynamics - galaxies; structure; HUBBLE-SPACE-TELESCOPE; TULLY-FISHER RELATION; SUPERDENSE MASSIVE GALAXIES; STAR-FORMING GALAXIES; INSIDE-OUT GROWTH; INFRARED SPECTROSCOPIC SURVEY; HIGH-REDSHIFT GALAXIES; K-SELECTED GALAXIES; SAMI PILOT SURVEY; ELLIPTIC GALAXIES;

D O I：

10.3847/1538-4357/aabc55

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present stellar rotation curves and velocity dispersion profiles for 104 quiescent galaxies at z = 0.6-1 from the Large Early Galaxy Astrophysics Census (LEGA-C) spectroscopic survey. Rotation is typically probed across 10-20 kpc, or to an average of 2.7R(e). Combined with central stellar velocity dispersions (sigma(0)) this provides the first determination of the dynamical state of a sample selected by a lack of star formation activity at large lookback time. The most massive galaxies (M-star > 2 x 10(11) M-circle dot) generally show no or little rotation measured at 5 kpc (vertical bar V-5 vertical bar /sigma(0) < 0.2 in eight of ten cases), while similar to 64% of less massive galaxies show significant rotation. This is reminiscent of local fast-and slow-rotating ellipticals and implies that low-and high-redshift quiescent galaxies have qualitatively similar dynamical structures. We compare vertical bar V-5 vertical bar sigma(0) distributions at z similar to 0.8 and the present day by re-binning and smoothing the kinematic maps of 91 low-redshift quiescent galaxies from the Calar Alto Legacy Integral Field Area (CALIFA) survey and find evidence for a decrease in rotational support since z similar to 1. This result is especially strong when galaxies are compared at fixed velocity dispersion; if velocity dispersion does not evolve for individual galaxies then the rotational velocity at 5 kpc was an average of 94 +/- 22% higher in z similar to 0.8 quiescent galaxies than today. Considering that the number of quiescent galaxies grows with time and that new additions to the population descend from rotationally supported star-forming galaxies, our results imply that quiescent galaxies must lose angular momentum between z similar to 1 and the present, presumably through dissipationless merging, and/or that the mechanism that transforms star-forming galaxies also reduces their rotational support.

引用

页数：26

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