Warm Molecular Hydrogen in Nearby, Luminous Infrared Galaxies

被引：23

作者：

Petric, Andreea O. ^{[1
,2
]}

Armus, Lee ^{[3
]}

Flagey, Nicolas ^{[2
]}

Guillard, Pierre ^{[4
]}

Howell, Justin ^{[3
]}

Inami, Hanae ^{[5
]}

Charmandaris, Vassillis ^{[6
,7
]}

Evanss, Aaron ^{[8
,9
]}

Stierwalt, Sabrina ^{[8
,9
]}

Diaz-Santos, Tanio ^{[3
,10
]}

Lu, Nanyao ^{[11
,12
]}

Spoon, Henrik ^{[13
]}

Mazzarella, Joe ^{[3
]}

Appleton, Phil ^{[3
]}

Chan, Ben ^{[3
]}

Chu, Jason ^{[1
]}

Hand, Derek ^{[14
]}

Privon, George ^{[15
]}

Sanders, David ^{[1
]}

Surace, Jason ^{[3
]}

Xu, Kevin ^{[3
]}

Zhao, Yinghe ^{[3
,16
,17
,18
]}

机构：

[1] 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

来源：

ASTRONOMICAL JOURNAL | 2018年 / 156卷 / 06期

基金：

国家重点研发计划;

关键词：

galaxies: active; galaxies: interactions; galaxies: ISM; galaxies: starburst; SPITZER-SPACE-TELESCOPE; STAR-FORMATION; STATISTICAL-METHODS; ASTRONOMICAL DATA; H-2; EMISSION; UPPER LIMITS; GAS; CLASSIFICATION; SPECTROGRAPH; SIMULATIONS;

D O I：

10.3847/1538-3881/aaca35

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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.

引用

页数：24

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