PMO OpenIR
CO observations of major merger pairs at z=0: molecular gas mass and star formation
Lisenfeld, Ute1,2; Xu, Cong Kevin3,4; Gao, Yu5; Domingue, Donovan L.6; Cao, Chen7,8; Yun, Min S.9; Zuo, Pei10
2019-07-09
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume627Pages:19
Corresponding AuthorLisenfeld, Ute(ute@ugr.es)
AbstractWe 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.
Keywordgalaxies: evolution galaxies: general galaxies: interactions galaxies: starburst ISM: molecules
DOI10.1051/0004-6361/201935536
WOS KeywordDIGITAL SKY SURVEY ; NEARBY SPIRAL GALAXIES ; IRAM LEGACY SURVEY ; ATOMIC GAS ; FORMATION EFFICIENCY ; STARBURSTS ; EVOLUTION ; DUST ; DEPLETION ; EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000474505600002
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/27467
Collection中国科学院紫金山天文台
Corresponding AuthorLisenfeld, Ute
Affiliation1.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
Recommended Citation
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.
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