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Herschel Spectroscopy of the Taffy Galaxies (UGC 12914/12915 = VV 254): Enhanced [C ii] Emission in the Collisionally Formed Bridge
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; Gao,Y.11; Helou,G.2; Jarrett,T. H.12; Joshi,B.13; Lisenfeld,U.14; Lu,N.15,16; Ogle,P.6; Pineau des Forêts,G.17; van der Werf,P.18; Xu,C. K.15,16
2018-03-16
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume855Issue:2
AbstractAbstract 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.
Keywordgalaxies: individual (UGC 12914, UGC 12915) galaxies: interactions intergalactic medium
DOI10.3847/1538-4357/aaac2c
Language英语
WOS IDIOP:0004-637X-855-2-aaac2c
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23522
Collection中国科学院紫金山天文台
Affiliation1.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
11.Purple Mountain Observatory, Key Lab of Radio Astronomy, Chinese Academy of Sciences, 210008, Nanjing, People’s Republic of China
12.Astronomy Department, University of Cape Town, Rondebosch, 7700, South Africa
13.School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA
14.Departamento de Física Teorica y del Cosmos, Universidad de Granada, Spain and Instituto Carlos I de Física Teorica y Computacional, Facultad de Ciencias, E-18071 Granada, Spain
15.National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, People’s Republic of China
16.China-Chile Joint Center for Astronomy, CAS, Camino El Observatorio 1515, Las Condes, Santiago, Chile
17.IAS (UMR 8617 du CNRS), Université de Paris Sud, F-91405 Orsay, France; LERMA (UMR 8112 du CNRS), Observatoire de Paris, 61 Avenue de l’Observatoire, F-75014 Paris, France
18.Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
Recommended Citation
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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