Submillimeter H2O and H2O+ emission in lensed ultra- and hyper-luminous infrared galaxies at z similar to 2-4
文献类型：期刊论文
| 作者 | Yang, C.1,2,3,4,5; Omont, A.4,5; Beelen, A.2; Gonzalez-Alfonso, E.6; Neri, R.7; Gao, Y.1 ; van der Werf, P.8; Weiss, A.9; Gavazzi, R.4,5; Falstad, N.10
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2016-11-01 |
| 卷号 | 595页码:23 |
| ISSN号 | 1432-0746 |
| 关键词 | galaxies: high-redshift galaxies: ISM infrared: galaxies submillimeter: galaxies radio lines: ISM ISM: molecules |
| DOI | 10.1051/0004-6361/201628160 |
| 通讯作者 | Yang, C.(yangcht@pmo.ac.cn) |
| 英文摘要 | We report rest-frame submillimeter H2O emission line observations of 11 ultra-or hyper-luminous infrared galaxies (ULIRGs or HyLIRGs) at z similar to 2-4 selected among the brightest lensed galaxies discovered in the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS). Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we have detected 14 new H2O emission lines. These include five 3(21)-3(12) ortho-H2O lines (E-up/k = 305 K) and nine J = 2 para-H2O lines, either 202-111 (E-up/k = 101 K) or 2(11)-2(02) (E-up/k = 137 K). The apparent luminosities of the H2O emission lines are mu LH2O similar to 6-21 x 10(8) L-circle dot (3 < mu < 15, where mu is the lens magnification factor), with velocity-integrated line fluxes ranging from 4-15 Jy km s(-1). We have also observed CO emission lines using EMIR on the IRAM 30 m telescope in seven sources (most of those have not yet had their CO emission lines observed). The velocity widths for CO and H2O lines are found to be similar, generally within 1 sigma errors in the same source. With almost comparable integrated flux densities to those of the high-J CO line (ratios range from 0.4 to 1.1), H2O is found to be among the strongest molecular emitters in high-redshift Hy/ULIRGs. We also confirm our previously found correlation between luminosity of H2O (L-H2O) and infrared (L-IR) that L-H2O similar to L-IR(1.1-1.2), with our new detections. This correlation could be explained by a dominant role of far-infrared pumping in the H2O excitation. Modelling reveals that the far-infrared radiation fields have warm dust temperature T-warm similar to 45-75 K, H2O column density per unit velocity interval N-H2O/Lambda V >= 0.3 x 10(15) cm(-2) km(-1) s and 100 mu m continuum opacity tau(100) > 1 (optically thick), indicating that H2O is likely to trace highly obscured warm dense gas. However, further observations of J >= 4 H2O lines are needed to better constrain the continuum optical depth and other physical conditions of the molecular gas and dust. We have also detected H2O + emission in three sources. A tight correlation between L-H2O and LH2O+ has been found in galaxies from low to high redshift. The velocity-integrated flux density ratio between H2O+ and H2O suggests that cosmic rays generated by strong star formation are possibly driving the H2O+ formation. |
| WOS关键词 | HIGH-REDSHIFT GALAXIES ; STAR-FORMING GALAXIES ; DENSE MOLECULAR GAS ; WATER-VAPOR ; HERSCHEL-SPIRE ; APM 08279+5255 ; ARP 220 ; STARBURST GALAXIES ; CONVERSION FACTORS ; INTERSTELLAR OH+ |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000388573500030 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23441]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Yang, C. |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 2.Univ Paris Saclay, Univ Paris Sud, Inst Astrophys Spatiale, CNRS, Bat 121, F-91405 Orsay, France 3.Chinese Acad Sci, Grad Univ, 19A Yuquan Rd, Beijing 10049, Peoples R China 4.CNRS, Inst Astrophys Paris, UMR 7095, F-75014 Paris, France 5.UPMC Univ Paris 06, Inst Astrophys Paris, UMR 7095, F-75014 Paris, France 6.Univ Alcala De Henares, Dept Fis & Matemat, Campus Univ, Madrid 28871, Spain 7.Inst Radioastron Millimetr IRAM, 300 Rue Piscine, St Martin Dheres 38406, France 8.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 9.Max Planck Inst Radioastron, Hgel 69, D-53121 Bonn, Germany 10.Chalmers, Dept Earth & Space Sci, Onsala Space Observ, S-43992 Onsala, Sweden |
| 推荐引用方式 GB/T 7714 | Yang, C.,Omont, A.,Beelen, A.,et al. Submillimeter H2O and H2O+ emission in lensed ultra- and hyper-luminous infrared galaxies at z similar to 2-4[J]. ASTRONOMY & ASTROPHYSICS,2016,595:23. |
| APA | Yang, C..,Omont, A..,Beelen, A..,Gonzalez-Alfonso, E..,Neri, R..,...&Valiante, E..(2016).Submillimeter H2O and H2O+ emission in lensed ultra- and hyper-luminous infrared galaxies at z similar to 2-4.ASTRONOMY & ASTROPHYSICS,595,23. |
| MLA | Yang, C.,et al."Submillimeter H2O and H2O+ emission in lensed ultra- and hyper-luminous infrared galaxies at z similar to 2-4".ASTRONOMY & ASTROPHYSICS 595(2016):23. |
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来源：紫金山天文台
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