CO observations of major merger pairs at z=0: molecular gas mass and star formation

doi:10.1051/0004-6361/201935536

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	CO observations of major merger pairs at z=0: molecular gas mass and star formation
	Lisenfeld, Ute 1,2; Xu, Cong Kevin 3,4; Gao, Yu 5; Domingue, Donovan L.6; Cao, Chen 7,8; Yun, Min S.9; Zuo, Pei 10
刊名	ASTRONOMY & ASTROPHYSICS
	2019-07-09
卷号	627 页码:19
关键词	galaxies: evolution galaxies: general galaxies: interactions galaxies: starburst ISM: molecules
ISSN号	1432-0746
DOI	10.1051/0004-6361/201935536
英文摘要	We present CO observations of 78 spiral galaxies in local merger pairs. These galaxies represent a subsample of a K-s-band-selected sample consisting of 88 close major-merger pairs (HKPAIR5), 44 spiral-spiral (S+S) pairs, and 44 spiral-elliptical (S+E) pairs, with separation < 20 h(-1) kpc and mass ratio < 2.5. For all objects, the star formation rate (SFR) and dust mass were derived from Herschel PACS and SPIRE data, and the atomic gas mass, M-HI, from the Green Bank Telescope HI observations. The complete data set allows us to study the relation between gas (atomic and molecular) mass, dust mass, and SFR in merger galaxies. We derive the molecular gas fraction (M-H2 /M-), molecular-to-atomic gas mass ratio (M-H2/M-HI), gas-to-dust mass ratio and SFE (= SFR/M-H2) and study their dependences on pair type (S+S compared to S+E), stellar mass, and the presence of morphological interaction signs. We find an overall moderate enhancement (similar to 2x) in both molecular gas fraction (M-H2/M-) and molecular-to-atomic gas ratio (M-H2/M-HI) for star-forming galaxies in major-merger pairs compared to non-interacting comparison samples, whereas no enhancement was found for the SFE nor for the total gas mass fraction ((M-HI+ M-H2)/M-). When divided into S+S and S+E, low mass and high mass, and with and without interaction signs, there is a small difference in SFE, a moderate difference in M-H2/M-, and a strong difference in M-H2/M-HI between subsamples. For the molecular-to-atomic gas ratio M-H2 /M-HI, the difference between S+S and S+E subsamples is 0.55 +/- 0.18 dex and between pairs with and without interaction sign 0.65 +/- 0.16 dex. Together, our results suggest that (1) star formation enhancement in close major-merger pairs occurs mainly in S+S pairs after the first close encounter (indicated by interaction signs) because the HI gas is compressed into star-forming molecular gas by the tidal torque; and (2) this effect is much weakened in the S+E pairs.
资助项目	National Key R&D Program of China[2016YFA0400702] ; National Key R&D Program of China[2017YFA0402704] ; National Key R&D Program of China[2017YFA0402700] ; National Natural Science Foundation of China[Y811251N01] ; Spanish Ministerio de Economia y Competitividad[AYA2014-53506-P] ; Spanish Ministerio de Economia y Competitividad[AYA2017-84897-P] ; European Regional Development Funds (FEDER)[AYA2014-53506-P] ; European Regional Development Funds (FEDER)[AYA2017-84897-P] ; Junta de Andalucia (Spain)[FQM108] ; NSFC[11420101002] ; NSFC[11861131007] ; CAS Key Frontier Sciences Program ; National Science Foundation of China[11721303] ; Chinese Academy of Sciences (CAS) ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain) ; [071-12] ; [177-15]
WOS关键词	DIGITAL SKY SURVEY ; NEARBY SPIRAL GALAXIES ; IRAM LEGACY SURVEY ; ATOMIC GAS ; FORMATION EFFICIENCY ; STARBURSTS ; EVOLUTION ; DUST ; DEPLETION ; EMISSION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000474505600002
资助机构	National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Spanish Ministerio de Economia y Competitividad ; Spanish Ministerio de Economia y Competitividad ; European Regional Development Funds (FEDER) ; European Regional Development Funds (FEDER) ; Junta de Andalucia (Spain) ; Junta de Andalucia (Spain) ; NSFC ; NSFC ; CAS Key Frontier Sciences Program ; CAS Key Frontier Sciences Program ; National Science Foundation of China ; National Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; INSU/CNRS (France) ; INSU/CNRS (France) ; MPG (Germany) ; MPG (Germany) ; IGN (Spain) ; IGN (Spain) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Spanish Ministerio de Economia y Competitividad ; Spanish Ministerio de Economia y Competitividad ; European Regional Development Funds (FEDER) ; European Regional Development Funds (FEDER) ; Junta de Andalucia (Spain) ; Junta de Andalucia (Spain) ; NSFC ; NSFC ; CAS Key Frontier Sciences Program ; CAS Key Frontier Sciences Program ; National Science Foundation of China ; National Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; INSU/CNRS (France) ; INSU/CNRS (France) ; MPG (Germany) ; MPG (Germany) ; IGN (Spain) ; IGN (Spain) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Spanish Ministerio de Economia y Competitividad ; Spanish Ministerio de Economia y Competitividad ; European Regional Development Funds (FEDER) ; European Regional Development Funds (FEDER) ; Junta de Andalucia (Spain) ; Junta de Andalucia (Spain) ; NSFC ; NSFC ; CAS Key Frontier Sciences Program ; CAS Key Frontier Sciences Program ; National Science Foundation of China ; National Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; INSU/CNRS (France) ; INSU/CNRS (France) ; MPG (Germany) ; MPG (Germany) ; IGN (Spain) ; IGN (Spain) ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Spanish Ministerio de Economia y Competitividad ; Spanish Ministerio de Economia y Competitividad ; European Regional Development Funds (FEDER) ; European Regional Development Funds (FEDER) ; Junta de Andalucia (Spain) ; Junta de Andalucia (Spain) ; NSFC ; NSFC ; CAS Key Frontier Sciences Program ; CAS Key Frontier Sciences Program ; National Science Foundation of China ; National Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; INSU/CNRS (France) ; INSU/CNRS (France) ; MPG (Germany) ; MPG (Germany) ; IGN (Spain) ; IGN (Spain)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26664]
专题	中国科学院国家天文台
通讯作者	Lisenfeld, Ute
作者单位	1.Univ Granada, Dept Fis Teor & Cosmos, Granada, Spain 2.Inst Carlos I Fis Teor & Computat, Fac Ciencias, Granada 18071, Spain 3.Chinese Acad Sci, Natl Astron Observ, Beijing 1000012, Peoples R China 4.CAS, South Amer Ctr Astron, Camino Observ 1515, Santiago, Chile 5.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China 6.Georgia Coll & State Univ, CBX 82, Milledgeville, GA 31061 USA 7.Shandong Univ, Sch Space Sci & Phys, Weihai 264209, Shandong, Peoples R China 8.Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China 9.Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA 10.Peking Univ, Kavli Inst Astron & Astrophys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Lisenfeld, Ute,Xu, Cong Kevin,Gao, Yu,et al. CO observations of major merger pairs at z=0: molecular gas mass and star formation[J]. ASTRONOMY & ASTROPHYSICS,2019,627:19.
APA	Lisenfeld, Ute.,Xu, Cong Kevin.,Gao, Yu.,Domingue, Donovan L..,Cao, Chen.,...&Zuo, Pei.(2019).CO observations of major merger pairs at z=0: molecular gas mass and star formation.ASTRONOMY & ASTROPHYSICS,627,19.
MLA	Lisenfeld, Ute,et al."CO observations of major merger pairs at z=0: molecular gas mass and star formation".ASTRONOMY & ASTROPHYSICS 627(2019):19.