The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas
文献类型：期刊论文
| 作者 | Decarli,Roberto2; Aravena,Manuel3; Boogaard,Leindert4; Carilli,Chris5; González-López,Jorge3; Walter,Fabian5,6; Cortes,Paulo C.7,8; Cox,Pierre9; Cunha,Elisabete da10; Daddi,Emanuele11 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-10-01 |
| 卷号 | 902期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Molecular gas Galaxy evolution Luminosity function |
| DOI | 10.3847/1538-4357/abaa3b |
| 英文摘要 | Abstract We present a CO and atomic fine-structure line-luminosity function analysis using the ALMA Spectroscopic Survey (ASPECS) in the Hubble Ultra Deep Field. ASPECS consists of two spatially overlapping mosaics that cover the entire ALMA 3 mm and 1.2 mm bands. We combine the results of a line-candidate search of the 1.2 mm data cube with those previously obtained from the 3 mm cube. Our analysis shows that ～80% of the line flux observed at 3 mm arises from CO(2–1) or CO(3–2) emitters at z?=?1–3 (“cosmic noon”). At 1.2 mm, more than half of the line flux arises from intermediate-J CO transitions (Jup?=?3–6); ～12% from neutral carbon lines; and <1% from singly ionized carbon, [C ii]. This implies that future [C ii] intensity mapping surveys in the epoch of reionization will need to account for a highly significant CO foreground. The CO luminosity functions probed at 1.2 mm show a decrease in the number density at a given line luminosity (in units of L′) at increasing Jup and redshift. Comparisons between the CO luminosity functions for different CO transitions at a fixed redshift reveal subthermal conditions on average in galaxies up to z?～?4. In addition, the comparison of the CO luminosity functions for the same transition at different redshifts reveals that the evolution is not driven by excitation. The cosmic density of molecular gas in galaxies, ρH2, shows a redshift evolution with an increase from high redshift up to z?～?1.5 followed by a factor ～6 drop down to the present day. This is in qualitative agreement with the evolution of the cosmic star formation rate density, suggesting that the molecular gas depletion time is approximately constant with redshift, after averaging over the star-forming galaxy population. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-902-2-ABAA3B |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62072]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Decarli,Roberto |
| 作者单位 | 1.International Associate, Cosmic Dawn Center (DAWN) at the Niels Bohr Institute, University of Copenhagen and DTU-Space, Technical University of Denmark, Copenhagen, Denmark 2.INAF—Osservatorio di Astrofisica e Scienza dello Spazio, via Gobetti 93/3, I-40129, Bologna, Italy; roberto.decarli@inaf.it 3.Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército 441, Santiago, Chile 4.Leiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands 5.National Radio Astronomy Observatory, Pete V. Domenici Array Science Center, P.O. Box O, Socorro, NM 87801, USA 6.Max Planck Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany 7.Joint ALMA Office, Alonso de Cordova 3107, Vitacura, Santiago, Chile 8.National Radio Astronomy Observatory, Charlottesville, VA 22903, USA 9.Institut d’Astrophysique de Paris, Sorbonne Université, CNRS, UMR 7095, 98 bis Blvd. Arago, F-75014 Paris, France 10.The University of Western Australia, ICRAR M468, 35 Stirling Hwy., Crawley WA 6009, Australia |
| 推荐引用方式 GB/T 7714 | Decarli,Roberto,Aravena,Manuel,Boogaard,Leindert,et al. The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas[J]. The Astrophysical Journal,2020,902(2). |
| APA | Decarli,Roberto.,Aravena,Manuel.,Boogaard,Leindert.,Carilli,Chris.,González-López,Jorge.,...&Weiss,Axel.(2020).The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas.The Astrophysical Journal,902(2). |
| MLA | Decarli,Roberto,et al."The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas".The Astrophysical Journal 902.2(2020). |
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