CO observations of major merger pairs at z=0: molecular gas mass and star formation
文献类型：期刊论文
| 作者 | Lisenfeld, Ute1,2; Xu, Cong Kevin3,4; Gao, Yu5 ; Domingue, Donovan L.6; Cao, Chen7,8; Yun, Min S.9; Zuo, Pei10
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2019-07-09 |
| 卷号 | 627页码:19 |
| ISSN号 | 1432-0746 |
| 关键词 | galaxies: evolution galaxies: general galaxies: interactions galaxies: starburst ISM: molecules |
| DOI | 10.1051/0004-6361/201935536 |
| 通讯作者 | Lisenfeld, Ute(ute@ugr.es) |
| 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. |
| 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 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/27466]  |
| 专题 | 中国科学院紫金山天文台 |
| 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. |
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来源：紫金山天文台
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