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.14,15; Lu, N.16,17; Ogle, P.6; des Forets, G. Pineau18,19; van der Werf, P.20; Xu, C. K.16,17

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 mu m and [O I]63.2 mu m fine-structure lines. Additionally, SPIRE FTS spectroscopy detects the [C I] P-3(2) -> P-3(1)(809.3 GHz) and [C I] P-3(1) -> P-3(0)(492.2 GHz) 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 H-2 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
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000427697100010
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorPeterson, B. W.
Affiliation1.Univ Wisconsin Barron Cty, 1800 Coll Dr, Rice Lake, WI 54868 USA
2.CALTECH, IPAC, MC 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA
3.Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico
4.Sorbonne Univ, CNRS, Inst Astrophys Paris, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France
5.Carnegie Inst Sci, Carnegie Observ, Pasadena, CA USA
6.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
7.Sorbonne Univ, Univ PSL, Ecole Normale Super, Observ Paris,CNRS,LERMA, F-75005 Paris, France
8.Univ Western Cape, Dept Phys & Astron, Robert Sobukwe Rd, ZA-7535 Bellville, South Africa
9.Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, F-67000 Strasbourg, France
10.Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada
11.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
12.Univ Cape Town, Astron Dept, ZA-7700 Rondebosch, South Africa
13.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
14.Univ Granada, Dept Fis Teor & Cosmos, Granada, Spain
15.Inst Carlos I Fis Teor & Computac, Fac Ciencias, E-18071 Granada, Spain
16.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
17.CAS, China Chile Joint Ctr Astron, Camino El Observ 1515, Santiago, Chile
18.Univ Paris 11, CNRS, IAS, UMR 8617, F-91405 Orsay, France
19.Observ Paris, CNRS, LERMA, UMR 8112, 61 Ave Observ, F-75014 Paris, France
20.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, 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]. ASTROPHYSICAL JOURNAL,2018,855(2):13.
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.ASTROPHYSICAL JOURNAL,855(2),13.
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".ASTROPHYSICAL JOURNAL 855.2(2018):13.
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