PMO OpenIR
The Effect of Galaxy Interactions on Molecular Gas Properties
Pan, Hsi-An1; Lin, Lihwai1; Hsieh, Bau-Ching1; Xiao, Ting2,3; Gao, Yang3; Ellison, Sara L.4; Scudder, Jillian M.5; Barrera-Ballesteros, Jorge6; Yuan, Fangting3; Saintonge, Amelie7; Wilsons, Christine D.8; Hwang, Ho Seong9; De Looze, Ilse7,10; Gao, Yu11; Ho, Luis C.12,13; Brinks, Elias14; Mok, Angus15; Brown, Toby8; Davis, Timothy A.16; Williams, Thomas G.16; Chung, Aeree17; Parsons, Harriet18; Bureau, Martin19; Sargent, Mark T.20; Chung, Eun Jung21; Kim, Eunbin21,22; Liu, Tie21,23; Michalowski, Michal J.24; Tosaki, Tomoka25
2018-12-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume868Issue:2Pages:20
Abstract

Galaxy interactions are often accompanied by an enhanced star formation rate (SFR). Since molecular gas is essential for star formation, it is vital to establish whether and by how much galaxy interactions affect the molecular gas properties. We investigate the effect of interactions on global molecular gas properties by studying a sample of 58 galaxies in pairs and 154 control galaxies. Molecular gas properties are determined from observations with the JCMT, PMO, and CSO telescopes and supplemented with data from the xCOLD GASS and JINGLE surveys at 12CO(1-0) and 12CO(2-1). The SFR, gas mass (MH2), and gas fraction (fgas) are all enhanced in galaxies in pairs by similar to 2.5 times compared to the controls matched in redshift, mass, and effective radius, while the enhancement of star formation efficiency (SFE equivalent to SFR/MH2) is less than a factor of 2. We also find that the enhancements in SFR, MH2 and fgas, increase with decreasing pair separation and are larger in systems with smaller stellar mass ratio. Conversely, the SFE is only enhanced in close pairs (separation <20 kpc) and equal-mass systems; therefore, most galaxies in pairs lie in the same parameter space on the SFR-MH2 plane as controls. This is the first time that the dependence of molecular gas properties on merger configurations is probed statistically with a relatively large sample and a carefully selected control sample for individual galaxies. We conclude that galaxy interactions do modify the molecular gas properties, although the strength of the effect is dependent on merger configuration.

Keywordgalaxies: interactions galaxies: ISM ISM: molecules galaxies: star formation
DOI10.3847/1538-4357/aaeb92
WOS KeywordSTAR-FORMATION RATES ; DIGITAL SKY SURVEY ; ULTRALUMINOUS INFRARED GALAXIES ; MASS-METALLICITY RELATION ; NEARBY SPIRAL GALAXIES ; SDSS IV MANGA ; LEGACY SURVEY ; FORMING GALAXIES ; MERGING GALAXIES ; FORMATION EFFICIENCY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000452021400002
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20678
Collection中国科学院紫金山天文台
Corresponding AuthorPan, Hsi-An
Affiliation1.Acad Sinica, Inst Astron & Astrophys, AS NTU Astron Math Bldg 1,Sect 4, Taipei 10617, Taiwan
2.Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China
3.Shanghai Astron Observ, Nandan Rd 80, Shanghai 200030, Peoples R China
4.Univ Victoria, Dept Phys & Astron, Finnerty Rd, Victoria, BC V8P 1A1, Canada
5.Oberlin Coll, Dept Phys & Astron, Oberlin, OH 44074 USA
6.Johns Hopkins Univ, Dept Phys & Astron, Bloomberg Ctr, 3400 N Charles St, Baltimore, MD 21218 USA
7.UCL, Gower St, London WC1E 6BT, England
8.McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
9.Korea Inst Adv Study, Quantum Univ Ctr, 85 Hoegiro, Seoul 02455, South Korea
10.Univ Ghent, Sterrenkundig Observ, Krijgslaan 281 S9, B-9000 Ghent, Belgium
11.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
12.Chinese Acad Sci, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
13.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
14.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
15.Univ Hertfordshire, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England
16.Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA
17.Cardiff Univ, Sch Phys & Astron, Queens Bldg, Cardiff CF24 3AA, Wales
18.Yonsei Univ, Dept Astron, 50 Yonsei Ro, Seoul 03722, South Korea
19.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA
20.Univ Oxford, Subdept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
21.Univ Sussex, Dept Phys & Astron, Astron Ctr, Brighton BN1 9QH, E Sussex, England
22.Kyung Hee Univ, Sch Space Res, Yongin 17104, Gyeonggi, South Korea
23.Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100012, Peoples R China
24.Adam Mickiewicz Univ, Astron Observ Inst, Fac Phys, Ul Sloneczna 36, PL-60286 Poznan, Poland
25.Joetsu Univ Educ, Yamayashiki Machi, Joetsu, Niigata 9438512, Japan
Recommended Citation
GB/T 7714
Pan, Hsi-An,Lin, Lihwai,Hsieh, Bau-Ching,et al. The Effect of Galaxy Interactions on Molecular Gas Properties[J]. ASTROPHYSICAL JOURNAL,2018,868(2):20.
APA Pan, Hsi-An.,Lin, Lihwai.,Hsieh, Bau-Ching.,Xiao, Ting.,Gao, Yang.,...&Tosaki, Tomoka.(2018).The Effect of Galaxy Interactions on Molecular Gas Properties.ASTROPHYSICAL JOURNAL,868(2),20.
MLA Pan, Hsi-An,et al."The Effect of Galaxy Interactions on Molecular Gas Properties".ASTROPHYSICAL JOURNAL 868.2(2018):20.
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