High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies
文献类型：期刊论文
| 作者 | Oteo, I.1,2; Zhang, Z-Y.1,2; Yang, C.3,4,5,6,7; Ivison, R. J.1,2; Omont, A.6,7; Bremer, M.8; Bussmann, S.1,2; Cooray, A.9; Cox, P.10; Dannerbauer, H.11,12 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2017-12-01 |
| 卷号 | 850期号:2页码:10 |
| 关键词 | galaxies: high-redshift galaxies: ISM galaxies: starburst galaxies: star formation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa8ee3 |
| 通讯作者 | Oteo, I.(ivanoteogomez@gmail.com) |
| 英文摘要 | We present ALMA J = 3-2 and VLA J = 1-0 observations of the dense molecular gas tracers HCN, HCO+, and HNC in two lensed, high-redshift starbursts selected from the Herschel-ATLAS survey: H-ATLAS J090740.0 -004200 (SDP.9, z(spec) = 1.575) and H-ATLAS J091043.1-000321 (SDP.11, z(spec) = 1.786). In SDP.9 we have detected all J = 3-2 transitions and also HCN(1-0) and HCO+(1-0). In SDP.11 we have detected HCN(3-2) and HCO+(3-2). The amplification factors for both galaxies have been determined from subarcsecond-resolution CO and dust emission observations carried out with NOEMA and the SMA. The HNC(1-0)/HCN(1-0) line ratio in SDP.9 suggests the presence of photon-dominated regions, as happens in most local (U)LIRGs. The CO, HCN, and HCO+ spectral line energy distribution (SLEDs) of SDP. 9 are compatible to those found for many local, IR-bright galaxies, indicating that the molecular gas in local and high-redshift dusty starbursts can have similar excitation conditions. We obtain that the correlation between total IR (L-IR) and dense line (L-dense) luminosity in SDP.9 and SDP.11 and local star-forming galaxies can be represented by a single relation. We argue that the scatter of the L-IR-L-dense correlation, together with the lack of sensitive dense molecular gas tracer observations for a homogeneous sample of high-redshift galaxies, prevents us from distinguishing differential trends with redshift. Our results suggest that the intense star formation found in some high-redshift, dusty, luminous starbursts is associated with more massive dense molecular gas reservoirs and higher dense molecular gas fractions. |
| WOS关键词 | LUMINOUS INFRARED GALAXIES ; MILLIMETER INTERFEROMETRIC HCN(1-0) ; HNC LINE EMISSION ; MOLECULAR GAS ; SUBMILLIMETER GALAXIES ; HERSCHEL-ATLAS ; ULTRALUMINOUS GALAXIES ; HCO+(1-0) OBSERVATIONS ; HIGH-REDSHIFT ; HCN |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000425472400004 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22301]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Oteo, I. |
| 作者单位 | 1.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland 2.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 3.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Paris Saclay, Univ Paris Sud, CNRS, Inst Astrophys Spatiale, Bat 121, F-91405 Orsay, France 5.Chinese Acad Sci, Grad Univ, 19A Yuquan Rd, Beijing 10049, Peoples R China 6.Inst Astrophys Paris, UMR 7095, CNRS, F-75014 Paris, France 7.UPMC Univ Paris 06, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France 8.Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England 9.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA 10.Joint ALMA Observ ESO, Av Alonso Cordova, Santiago 3104, Chile |
| 推荐引用方式 GB/T 7714 | Oteo, I.,Zhang, Z-Y.,Yang, C.,et al. High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies[J]. ASTROPHYSICAL JOURNAL,2017,850(2):10. |
| APA | Oteo, I..,Zhang, Z-Y..,Yang, C..,Ivison, R. J..,Omont, A..,...&Van der Werf, P..(2017).High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies.ASTROPHYSICAL JOURNAL,850(2),10. |
| MLA | Oteo, I.,et al."High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies".ASTROPHYSICAL JOURNAL 850.2(2017):10. |
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来源：紫金山天文台
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