Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge
文献类型：期刊论文
| 作者 | Peterson,B. W.1; Appleton,P. N.2; Bitsakis,T.3; Guillard,P.4; Alatalo,K.5,6; Boulanger,F.7; Cluver,M.8; Duc,P.-A.9; Falgarone,E.7; Gallagher,S.10 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2018-03-16 |
| 卷号 | 855期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | galaxies: individual (UGC 12914, UGC 12915) galaxies: interactions intergalactic medium |
| DOI | 10.3847/1538-4357/aaac2c |
| 英文摘要 | Abstract Using the PACS and SPIRE spectrometers on board Herschel, we obtained observations of the Taffy galaxies (UGC 12914/12915) and bridge. The Taffy system is believed to be the result of a face-on collision between two gas-rich galaxies, in which the stellar disks passed through each other, but the gas was dispersed into a massive H i and molecular bridge between them. Emission is detected and mapped in both galaxies and the bridge in the [C ii]157.7?μm and [O i]63.2?μm fine-structure lines. Additionally, SPIRE FTS spectroscopy detects the [C i] and [C i] neutral carbon lines, and weakly detects high-J CO transitions in the bridge. These results indicate that the bridge is composed of a warm multi-phase medium consistent with shock and turbulent heating. Despite low star formation rates in the bridge, the [C ii] emission appears to be enhanced, reaching [C ii]/FIR ratios of 3.3% in parts of the bridge. Both the [C ii] and [O i] lines show broad intrinsic multi-component profiles, similar to those seen in previous CO (1–0) and H i observations. The [C ii] emission shares similar line profiles with both the double-peaked H i profiles and shares a high-velocity component with single-peaked CO profiles in the bridge, suggesting that the [C ii] emission originates in both the neutral and molecular phases. We show that it is feasible that a combination of turbulently heated H2 and high column-density H i, resulting from the galaxy collision, is responsible for the enhanced [C ii] emission. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-855-2-AAAC2C |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23521]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.University of Wisconsin—Barron County, 1800 College Drive, Rice Lake, WI 54868, USA; bradley.peterson@uwc.edu 2.Caltech/IPAC, MC 100-22, 1200 E. California Boulevard, Pasadena, CA 91125, USA; apple@ipac.caltech.edu 3.Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Morelia, 58089, Mexico 4.Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Bd Arago, F-75014 Paris, France 5.Carnegie Observatories, Carnegie Institute of Washington, Pasadena, CA, USA 6.Space Telescope Science Institute, 3700, San Martin Drive, Baltimore, MD 21218, USA 7.Observatoire de Paris, Université PSL, Sorbonne Université, Ecole normale supérieure, CNRS, LERMA, F-75005, Paris, France 8.Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Bellville, 7535, South Africa 9.Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France 10.Department of Physics and Astronomy, University of Western Ontario, London, ON, N6A 3K7, Canada |
| 推荐引用方式 GB/T 7714 | Peterson,B. W.,Appleton,P. N.,Bitsakis,T.,et al. Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge[J]. The Astrophysical Journal,2018,855(2). |
| APA | Peterson,B. W..,Appleton,P. N..,Bitsakis,T..,Guillard,P..,Alatalo,K..,...&Xu,C. K..(2018).Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge.The Astrophysical Journal,855(2). |
| MLA | Peterson,B. W.,et al."Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge".The Astrophysical Journal 855.2(2018). |
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