An ALMA view of star formation efficiency suppression in early-type galaxies after gas-rich minor mergers

被引：33

作者：

de Voort, Freeke van ^{[1
,2
,3
,4
,5
]}

Davis, Timothy A. ^{[6
]}

Matsushita, Satoki ^{[2
]}

Rowlands, Kate ^{[7
]}

Shabala, Stanislav S. ^{[8
]}

Allison, James R. ^{[9
,10
]}

Ting, Yuan-Sen ^{[11
,12
,13
]}

Sansom, Anne E. ^{[14
]}

van der Werf, Paul P. ^{[15
]}

机构：

[1] Heidelberg Inst Theoret Studies, Schloss Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany

[2] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

[3] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Theoret Astrophys Ctr, Berkeley, CA 94720 USA

[5] Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA

[6] Cardiff Univ, Sch Phys & Astron, Queens Bldg, Cardiff CF24 3AA, S Glam, Wales

[7] Johns HopkinsUnivers, Bloomberg Ctr, Dept Phys Astron, 3400 N Charles St, Baltimore, MD 21218 USA

[8] Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia

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

[10] ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia

[11] Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA

[12] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[13] Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA

[14] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England

[15] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 476卷 / 01期

基金：

英国科学技术设施理事会; 澳大利亚研究理事会;

关键词：

galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: formation; galaxies: ISM; galaxies: kinematics and dynamics; galaxies: star formation; DIGITAL-SKY-SURVEY; MOLECULAR GAS; ELLIPTIC GALAXIES; INFRARED-EMISSION; ATLAS(3D) PROJECT; MASSIVE GALAXIES; NEARBY GALAXIES; DISC GALAXIES; ZOO DUST; STARBURSTS;

D O I：

10.1093/mnras/sty228

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Gas-rich minor mergers contribute significantly to the gas reservoir of early-type galaxies (ETGs) at low redshift, yet the star formation efficiency (SFE; the star formation rate divided by the molecular gas mass) appears to be strongly suppressed following some of these events, in contrast to the more well-known merger-driven starbursts. We present observations with the Atacama Large Millimeter/submillimeter Array (ALMA) of six ETGs, which have each recently undergone a gas-rich minor merger, as evidenced by their disturbed stellar morphologies. These galaxies were selected because they exhibit extremely low SFEs. We use the resolving power of ALMA to study the morphology and kinematics of the molecular gas. The majority of our galaxies exhibit spatial and kinematical irregularities, such as detached gas clouds, warps, and other asymmetries. These asymmetries support the interpretation that the suppression of the SFE is caused by dynamical effects stabilizing the gas against gravitational collapse. Through kinematic modelling we derive high velocity dispersions and Toomre Q stability parameters for the gas, but caution that such measurements in edge-on galaxies suffer from degeneracies. We estimate merger ages to be about 100 Myr based on the observed disturbances in the gas distribution. Furthermore, we determine that these galaxies lie, on average, two orders of magnitude below the Kennicutt-Schmidt relation for star-forming galaxies as well as below the relation for relaxed ETGs. We discuss potential dynamical processes responsible for this strong suppression of star formation surface density at fixed molecular gas surface density.

引用

页码：122 / 132

页数：11

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