Deriving a multivariate alpha(CO) conversion function using the [C II]/CO (1-0) ratio and its application to molecular gas scaling relations
文献类型：期刊论文
| 作者 | Accurso, G.15; Saintonge, A.15; Catinella, B.2; Cortese, L.2; Dave, R.3; Dunsheath, S. H.4; Genzel, R.5; Gracia-Carpio, J.5; Heckman, T. M.6; Jimmy7 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-10-01 |
| 卷号 | 470期号:4页码:4750-4766 |
| ISSN号 | 0035-8711 |
| 关键词 | Surveys Galaxies: Evolution Galaxies: Fundamental Parameters Galaxies: Ism Radio Lines: Galaxies |
| DOI | 10.1093/mnras/stx1556 |
| 英文摘要 | We present Herschel PACS observations of the [C II] 158 mu m emission line in a sample of 24 intermediate mass (9 < logM*/M circle dot < 10) and low metallicity (0.4 < Z/Z circle dot < 1.0) galaxies from the xCOLD GASS survey. In combination with IRAM CO(1-0) measurements, we establish scaling relations between integrated and molecular region L[C II]/LCO(1-0) ratios as a function of integrated galaxy properties. A Bayesian analysis reveals that only two parameters, metallicity and offset from the main sequence, Delta(MS), are needed to quantify variations in the luminosity ratio; metallicity describes the total dust content available to shield CO from UV radiation, while Delta (MS) describes the strength of this radiation field. We connect the L[C II]/LCO(1-0) ratio to the CO-to-H-2 conversion factor and find a multivariate conversion function, which can be used up to z similar to 2.5. This function depends primarily on metallicity, with a second-order dependence on Delta (MS). We apply this to the full xCOLD GASS and PHIBSS1 surveys and investigate molecular gas scaling relations. We find a flattening of the relation between gas mass fraction and stellar mass at logM* < 10.0. While the molecular gas depletion time varies with sSFR, it is mostly independent of mass, indicating that the low L-CO/SFR ratios long observed in low-mass galaxies are entirely due to photodissociation of CO and not to an enhanced star formation efficiency. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000408207600070 |
| 源URL | [http://119.78.226.72/handle/331011/32557]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Saintonge, A. |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Western Australia, Int Ctr Radio Astron Res, M468,35 Stirling Highway, Crawley, WA 6009, Australia 3.Univ Western Cape, ZA-7535 Cape Town, South Africa 4.CALTECH, Mail Code 301-17,1200 E Calif Blvd, Pasadena, CA 91125 USA 5.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany 6.Johns Hopkins Univ, Dept Phys & Astron, Ctr Astrophys Sci, Baltimore, MD 21218 USA 7.Texas A&M Univ, George P & Cynthia W Mitchell Inst Fundamental Ph, Dept Phys & Astron, College Stn, TX 77843 USA 8.Inst Radioastron Milimetr IRAM, Nucleo Cent, Av Div Pastora 7, E-18012 Granada, Spain 9.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 10.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China |
| 推荐引用方式 GB/T 7714 | Accurso, G.,Saintonge, A.,Catinella, B.,et al. Deriving a multivariate alpha(CO) conversion function using the [C II]/CO (1-0) ratio and its application to molecular gas scaling relations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,470(4):4750-4766. |
| APA | Accurso, G..,Saintonge, A..,Catinella, B..,Cortese, L..,Dave, R..,...&Wang, J..(2017).Deriving a multivariate alpha(CO) conversion function using the [C II]/CO (1-0) ratio and its application to molecular gas scaling relations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,470(4),4750-4766. |
| MLA | Accurso, G.,et al."Deriving a multivariate alpha(CO) conversion function using the [C II]/CO (1-0) ratio and its application to molecular gas scaling relations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.4(2017):4750-4766. |
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来源：上海天文台
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