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 | |
刊名 | ASTRONOMICAL JOURNAL |
2018-12-01 | |
卷号 | 156期号:6页码:24 |
关键词 | galaxies: active galaxies: interactions galaxies: ISM galaxies: starburst |
ISSN号 | 0004-6256 |
DOI | 10.3847/1538-3881/aaca35 |
产权排序 | 第16完成单位 |
文献子类 | Article |
英文摘要 | Mid-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. |
学科主题 | 天文学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | NASA[1407] ; EU[PIRSES-GA-2012-316788] ; NSFC[11673028] ; National Key R&D Program of China[2017YFA0402704] |
WOS关键词 | SPITZER-SPACE-TELESCOPE ; STAR-FORMATION ; STATISTICAL-METHODS ; ASTRONOMICAL DATA ; H-2 EMISSION ; UPPER LIMITS ; GAS ; CLASSIFICATION ; SPECTROGRAPH ; SIMULATIONS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000452546300001 |
资助机构 | NASA[1407] ; EU[PIRSES-GA-2012-316788] ; NSFC[11673028] ; National Key R&D Program of China[2017YFA0402704] |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/18608] |
专题 | 云南天文台_丽江天文观测站(南方基地) 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Petric, Andreea O. |
作者单位 | 1.Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 2.Canada–France–Hawaii Telescope, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA 3.Infrared Processing & Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125, USA 4.Institut d'Astrophysique de Paris, 96 bis boulevard Arago, F-75014 Paris, France 5.Universite de Lyon, 92 Rue Pasteur, F-69007, Lyon, France 6.Department of Physics, University of Crete, GR-71003 Heraklion, Greece 7.IAASARS, National Observatory of Athens, GR-15236, Penteli, Greece 8.Department of Astronomy, University of Virginia, Charlottesville, VA 22903, USA 9.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA 10.Nucleo de Astronomia de la Facultad de Ingenieria, Universitad Diego Portales, Av. Ejercito Libertador 441, Santiago, Chile |
推荐引用方式 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 YH.(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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