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WARM MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES
Lu, N.1; Zhao, Y.1,2,3; Xu, C. K.1; Gao, Y.2,3; Armus, L.4; Mazzarella, J. M.1; Isaak, K. G.5; Petric, A. O.6,7; Charmandaris, V.8,9,10; Diaz-Santos, T.4; Evans, A. S.11,12; Howell, J.1; Appleton, P.1; Inami, H.13; Iwasawa, K.14,15; Leech, J.16; Lord, S.1; Sanders, D. B.17; Schulz, B.1; Surace, J.4; van der Werf, P. P.18
2014-06-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume787Issue:2Pages:0
AbstractWe present our initial results on the CO rotational spectral line energy distribution (SLED) of the J to J-1 transitions from J = 4 up to 13 from Herschel SPIRE spectroscopic observations of 65 luminous infrared galaxies (LIRGs) in the Great Observatories All-Sky LIRG Survey. The observed SLEDs change on average from one peaking at J <= 4 to a broad distribution peaking around J similar to 6 to 7 as the IRAS 60-to-100 mu m color, C(60/100), increases. However, the ratios of a CO line luminosity to the total infrared luminosity, L-IR, show the smallest variation for J around 6 or 7. This suggests that, for most LIRGs, ongoing star formation (SF) is also responsible for a warm gas component that emits CO lines primarily in the mid-J regime (5 less than or similar to J less than or similar to 10). As a result, the logarithmic ratios of the CO line luminosity summed over CO (5-4), (6-5), (7-6), (8-7) and (10-9) transitions to L-IR, log R-midCO, remain largely independent of C(60/100), and show a mean value of -4.13 ( log R-midCO(SF)) and a sample standard deviation of only 0.10 for the SF-dominated galaxies. Including additional galaxies from the literature, we show, albeit with a small number of cases, the possibility that galaxies, which bear powerful interstellar shocks unrelated to the current SF, and galaxies, in which an energetic active galactic nucleus contributes significantly to the bolometric luminosity, have their R-midCO higher and lower than R-midCO(SF), respectively.
KeywordGalaxies: Active Galaxies: Ism Galaxies: Star Formation Infrared: Galaxies Ism: Molecules Submillimeter: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/787/2/L23
WOS KeywordSTAR-FORMATION RATE ; SPITZER-SPACE-TELESCOPE ; NGC 6240 ; SPIRE SPECTROSCOPY ; RADIO GALAXIES ; EMISSION ; CO ; LINE ; EXCITATION ; STARBURST
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000336797700008
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10693
Collection星系中的恒星形成研究团组
Affiliation1.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
5.European Space Agcy, Estec, Astrophys Miss Div, NL-2200 AG Noordwijk, Netherlands
6.Gemini Observ, Hilo, HI 96720 USA
7.CALTECH, Dept Astron, Pasadena, CA 91125 USA
8.Univ Crete, Dept Phys, GR-71003 Iraklion, Greece
9.Natl Observ Athens, IAASARS, GR-15236 Penteli, Greece
10.Observ Paris, Chercheur Associe, F-75014 Paris, France
11.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
12.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
13.Natl Opt Astron Observ, Tucson, AZ 85719 USA
14.Univ Barcelona, ICREA, E-08028 Barcelona, Spain
15.Univ Barcelona, ICC, E-08028 Barcelona, Spain
16.Univ Oxford, Dept Phys, Oxford OX1 3RH, England
17.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
18.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
Recommended Citation
GB/T 7714
Lu, N.,Zhao, Y.,Xu, C. K.,et al. WARM MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,787(2):0.
APA Lu, N..,Zhao, Y..,Xu, C. K..,Gao, Y..,Armus, L..,...&van der Werf, P. P..(2014).WARM MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES.ASTROPHYSICAL JOURNAL LETTERS,787(2),0.
MLA Lu, N.,et al."WARM MOLECULAR GAS IN LUMINOUS INFRARED GALAXIES".ASTROPHYSICAL JOURNAL LETTERS 787.2(2014):0.
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