SDSS-IV MaNGA-resolved Star Formation and Molecular Gas Properties of Green Valley Galaxies: A First Look with ALMA and MaNGA

被引：21

作者：

Lin, Lihwai ^{[1
]}

Belfiore, Francesco ^{[2
,3
,4
]}

Pan, Hsi-An ^{[1
]}

Bothwell, M. S. ^{[2
,3
]}

Hsieh, Pei-Ying ^{[1
]}

Huang, Shan ^{[5
]}

Xiao, Ting ^{[6
]}

Sanchez, Sebastian F. ^{[7
]}

Hsieh, Bau-Ching ^{[1
]}

Masters, Karen ^{[8
]}

Ramya, S. ^{[6
]}

Lin, Jing-Hua ^{[1
,9
]}

Hsu, Chin-Hao ^{[1
,9
]}

Li, Cheng ^{[10
,11
]}

Maiolino, Roberto ^{[2
,3
]}

Bundy, Kevin ^{[4
]}

Bizyaev, Dmitry ^{[12
,13
,14
]}

Drory, Niv ^{[15
]}

Ibarra-Medel, Hector ^{[7
]}

Lacerna, Ivan ^{[16
,17
,18
]}

Haines, Tim ^{[19
]}

Smethurst, Rebecca ^{[20
]}

Stark, David V. ^{[21
]}

Thomas, Daniel ^{[8
]}

机构：

[1] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan

[2] Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England

[3] Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HE, England

[4] Univ Calif Santa Cruz, UCO Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA

[5] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[6] Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China

[7] Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico

[8] Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England

[9] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

[10] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China

[11] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[12] Apache Point Observ, POB 59, Sunspot, NM 88349 USA

[13] New Mexico State Univ, POB 59, Sunspot, NM 88349 USA

[14] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia

[15] Univ Texas Austin, McDonald Observ, 1 Univ Stn, Austin, TX 78712 USA

[16] Inst Milenio Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile

[17] Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[18] Astrophys Res Consortium, Phys Astron Bldg,Rm C319,3910 15th Ave NE, Seattle, WA 98195 USA

[19] Univ Wisconsin, Dept Astron, 475N Charter St, Madison, WI 53703 USA

[20] Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England

[21] Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 851卷 / 01期

基金：

美国安德鲁·梅隆基金会; 英国科学技术设施理事会;

关键词：

Galaxies:; evolution; FORMATION HISTORIES; NEARBY GALAXIES; FORMATION RATES; DEPLETION TIME; EVOLUTION; RED; II; DECOMPOSITION; TELESCOPE; GRADIENTS;

D O I：

10.3847/1538-4357/aa96ae

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the role of cold gas in quenching star formation in the green valley by analyzing ALMA (CO)-C-12 (1-0) observations of three galaxies with resolved optical spectroscopy from the MaNGA survey. We present resolution-matched maps of the star formation rate and molecular gas mass. These data are used to calculate the star formation efficiency (SFE) and gas fraction (f(gas)) for these galaxies separately in the central "bulge" regions and outer disks. We find that, for the two galaxies whose global specific star formation rate (sSFR) deviates most from the star formation main sequence, the gas fraction in the bulges is significantly lower than that in their disks, supporting an "inside-out" model of galaxy quenching. For the two galaxies where SFE can be reliably determined in the central regions, the bulges and disks share similar SFEs. This suggests that a decline in f(gas). is the main driver of lowered sSFR in bulges compared to disks in green valley galaxies. Within the disks, there exist common correlations between the sSFR and SFE and between sSFR and f(gas). on kiloparsec scales-the local SFE or f(gas). in the disks declines with local sSFR. Our results support a picture in which the sSFR in bulges is primarily controlled by f(gas), whereas both SFE and f(gas). play a role in lowering the sSFR in disks. A larger sample is required to confirm if the trend established in this work is representative of the green valley as a whole.

引用

页数：9

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