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EVIDENCE FOR CO SHOCK EXCITATION IN NGC 6240 FROM HERSCHEL SPIRE SPECTROSCOPY
Meijerink, R.1,2; Kristensen, L. E.2; Weiss, A.3; van der Werf, P. P.2; Walter, F.4; Spaans, M.1; Loenen, A. F.2; Fischer, J.5; Israel, F. P.2; Isaak, K.6; Papadopoulos, P. P.3; Aalto, S.7; Armus, L.8; Charmandaris, V.9; Dasyra, K. M.10; Diaz-Santos, T.8; Evans, A.11,12; Gao, Y.13; Gonzalez-Alfonso, E.14; Guesten, R.3; Henkel, C.3,15; Kramer, C.16; Lord, S.17; Martin-Pintado, J.18; Naylor, D.19; Sanders, D. B.20; Smith, H.21; Spinoglio, L.22; Stacey, G.23; Veilleux, S.24; Wiedner, M. C.25
2013-01-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume762Issue:2Pages:L16
AbstractWe present Herschel SPIRE FTS spectroscopy of the nearby luminous infrared galaxy NGC 6240. In total 20 lines are detected, including CO J = 4-3 through J = 13-12, 6 H2O rotational lines, and [C I] and [N II] fine-structure lines. The CO to continuum luminosity ratio is 10 times higher in NGC 6240 than Mrk 231. Although the CO ladders of NGC 6240 and Mrk 231 are very similar, UV and/or X-ray irradiation are unlikely to be responsible for the excitation of the gas in NGC 6240. We applied both C and J shock models to the H-2 v = 1-0 S(1) and v = 2-1 S(1) lines and the CO rotational ladder. The CO ladder is best reproduced by a model with shock velocity v(s) = 10 km s(-1) and a pre-shock density n(H) = 5 x 10(4) cm(-3). We find that the solution best fitting the H-2 lines is degenerate. The shock velocities and number densities range between v(s) = 17-47 km s(-1) and n(H) = 10(7)-5x10(4) cm(-3), respectively. The H-2 lines thus need a much more powerful shock than the CO lines. We deduce that most of the gas is currently moderately stirred up by slow (10 km s(-1)) shocks while only a small fraction (less than or similar to 1%) of the interstellar medium is exposed to the high-velocity shocks. This implies that the gas is rapidly losing its highly turbulent motions. We argue that a high CO line-to-continuum ratio is a key diagnostic for the presence of shocks.
KeywordGalaxies: Active Galaxies: Individual (Ngc 6240) Galaxies: Nuclei Galaxies: Starburst Infrared: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/762/2/L16
WOS KeywordLUMINOUS INFRARED GALAXIES ; MOLECULAR GAS ; STAR-FORMATION ; ARP 220 ; MARKARIAN 231 ; NGC-6240 ; DIAGNOSTICS ; NUCLEI ; DENSE ; ENVIRONMENTS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000325876300001
Citation statistics
Cited Times:72[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10049
Collection星系中的恒星形成研究团组
Affiliation1.Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
2.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
3.Max Planck Inst Radioastron, D-53121 Bonn, Germany
4.Max Planck Inst Astron, D-69117 Heidelberg, Germany
5.Naval Res Lab, Remote Sensing Div, Washington, DC 20375 USA
6.Estec, ESA Astrophys Miss Div, NL-2200 AG Noordwijk, Netherlands
7.Chalmers, Onsala Observ, Dept Radio & Space Sci, SE-43992 Onsala, Sweden
8.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
9.Univ Crete, Dept Phys, GR-71003 Iraklion, Greece
10.Observ Paris, LERMA CNRS UMR8112, F-75014 Paris, France
11.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
12.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
13.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
14.Univ Alcala de Henares, Dept Fis, E-28871 Madrid, Spain
15.King Abdulaziz Univ, Dept Astron, Jeddah 21413, Saudi Arabia
16.IRAM, E-18012 Granada, Spain
17.CALTECH, NASA Herschel Sci Ctr, Pasadena, CA 91125 USA
18.CSIC, Inst Estruct Mat, Dept Astrofis Mol & Infrarroja, E-28006 Madrid, Spain
19.Univ Lethbridge, Dept Phys & Astron, Inst Space Imaging Sci, Lethbridge, AB T1K 3M4, Canada
20.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
21.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
22.INAF, Ist Astrofis & Planetol Spaziali, I-00133 Rome, Italy
23.Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
24.Univ Maryland, Dept Astron, College Pk, MD 20742 USA
25.Observ Paris, LERMA, CNRS, F-75014 Paris, France
Recommended Citation
GB/T 7714
Meijerink, R.,Kristensen, L. E.,Weiss, A.,et al. EVIDENCE FOR CO SHOCK EXCITATION IN NGC 6240 FROM HERSCHEL SPIRE SPECTROSCOPY[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,762(2):L16.
APA Meijerink, R..,Kristensen, L. E..,Weiss, A..,van der Werf, P. P..,Walter, F..,...&Wiedner, M. C..(2013).EVIDENCE FOR CO SHOCK EXCITATION IN NGC 6240 FROM HERSCHEL SPIRE SPECTROSCOPY.ASTROPHYSICAL JOURNAL LETTERS,762(2),L16.
MLA Meijerink, R.,et al."EVIDENCE FOR CO SHOCK EXCITATION IN NGC 6240 FROM HERSCHEL SPIRE SPECTROSCOPY".ASTROPHYSICAL JOURNAL LETTERS 762.2(2013):L16.
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