Warm Molecular Hydrogen in Nearby, Luminous Infrared Galaxies
Petric, Andreea O.1,2; Armus, Lee3; Flagey, Nicolas2; Guillard, Pierre4; Howell, Justin3; Inami, Hanae5; Charmandaris, Vassillis6,7; Evanss, Aaron8,9; Stierwalt, Sabrina8,9; Diaz-Santos, Tanio3,10; Lu, Nanyao11,12; Spoon, Henrik13; Mazzarella, Joe3; Appleton, Phil3; Chan, Ben3; Chu, Jason1; Hand, Derek14; Privon, George15; Sanders, David1; Surace, Jason3; Xu, Kevin3; Zhao, Yinghe3,16,17,18
Corresponding AuthorPetric, Andreea O.(
AbstractMid-infrared molecular hydrogen (H-2) emission is a powerful cooling agent in galaxy mergers and in radio galaxies; it is a potential key tracer of gas evolution and energy dissipation associated with mergers, star formation, and accretion onto supermassive black holes. We detect mid-IR H-2 line emission in at least one rotational transition in 91% of the 214 Luminous Infrared Galaxies (LIRGs) observed with Spitzer as part of the Great Observatories All-sky LIRG Survey. We use H-2 excitation diagrams to estimate the range of masses and temperatures of warm molecular gas in these galaxies. We find that LIRGs in which the IR emission originates mostly from the Active Galactic Nuclei (AGN) have about 100 K higher H-2 mass-averaged excitation temperatures than LIRGs in which the IR emission originates mostly from star formation. Between 10% and 15% of LIRGs have H-2 emission lines that are sufficiently broad to be resolved or partially resolved by the high-resolution modules of Spitzer's Infrared Spectrograph (IRS). Those sources tend to be mergers and contain AGN. This suggests that a significant fraction of the H-2 line emission is powered by AGN activity through X-rays, cosmic rays, and turbulence. We find a statistically significant correlation between the kinetic energy in the H-2 gas and the H-2 to IR luminosity ratio. The sources with the largest warm gas kinetic energies are mergers. We speculate that mergers increase the production of bulk inflows leading to observable broad H-2 profiles and possibly denser gas.
Keywordgalaxies: active galaxies: interactions galaxies: ISM galaxies: starburst
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000452546300001
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorPetric, Andreea O.
Affiliation1.Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
2.Canada France Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, HI 96743 USA
3.CALTECH, Ctr Infrared Proc & Anal, MS 100-22, Pasadena, CA 91125 USA
4.Inst Astrophys Paris, 96 Bis Blvd Arago, F-75014 Paris, France
5.Univ Lyon, 92 Rue Pasteur, F-69007 Lyon, France
6.Univ Crete, Dept Phys, GR-71003 Iraklion, Greece
7.Natl Observ Athens, IAASARS, GR-15236 Penteli, Greece
8.Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
9.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
10.Univ Diego Portales, Fac Ingn, Nucleo Astron, Av Ejercito Libertador 441, Santiago, Chile
11.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
12.China Chile Joint Ctr Astron, Camino Observ 1515, Santiago, Chile
13.Cornell Univ, Dept Astron, 616A Space Sci Bldg, Ithaca, NY 14853 USA
14.Univ Hawaii, Dept Phys & Astron, 200 W Kawili St, Hilo, HI 96720 USA
15.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile
16.Chinese Acad Sci, Yunnan Observ, Kunming 65011, Peoples R China
17.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 65011, Peoples R China
18.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Petric, Andreea O.,Armus, Lee,Flagey, Nicolas,et al. Warm Molecular Hydrogen in Nearby, Luminous Infrared Galaxies[J]. ASTRONOMICAL JOURNAL,2018,156(6):24.
APA Petric, Andreea O..,Armus, Lee.,Flagey, Nicolas.,Guillard, Pierre.,Howell, Justin.,...&Zhao, Yinghe.(2018).Warm Molecular Hydrogen in Nearby, Luminous Infrared Galaxies.ASTRONOMICAL JOURNAL,156(6),24.
MLA Petric, Andreea O.,et al."Warm Molecular Hydrogen in Nearby, Luminous Infrared Galaxies".ASTRONOMICAL JOURNAL 156.6(2018):24.
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