A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies

doi:10.3847/1538-4357/aa81d7

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	A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies
	Díaz-Santos,T.2; Armus,L.3; Charmandaris,V.4,5; Lu,N.6,7; Stierwalt,S.8,9; Stacey,G.1; Malhotra,S.10; Werf,P. P. van der 11; Howell,J. H.3; Privon,G. C.12,13
刊名	The Astrophysical Journal
	2017-08-29
卷号	846 期号:1
关键词	galaxies: evolution galaxies: ISM galaxies: nuclei galaxies: starburst infrared: galaxies
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa81d7
英文摘要	Abstract We present an analysis of , [O iii]88, [N ii]122, and far-infrared (FIR) fine-structure line observations obtained with Herschel/PACS, for ～240 local luminous infrared galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey. We find pronounced declines (“deficits”) of line-to-FIR continuum emission for [N ii]122, , and as a function of FIR color and infrared luminosity surface density, . The median electron density of the ionized gas in LIRGs, based on the [N ii]122/[N ii]205 ratio, is ?=?41 cm?3. We find that the dispersion in the deficit of LIRGs is attributed to a varying fractional contribution of photodissociation regions (PDRs) to the observed emission, f( )?=? / , which increases from ～60% to ～95% in the warmest LIRGs. The / ratio is tightly correlated with the PDR gas kinetic temperature in sources where is not optically thick or self-absorbed. For each galaxy, we derive the average PDR hydrogen density, , and intensity of the interstellar radiation field, G, in units of and find G/ ratios of ～0.1–50 cm3, with ULIRGs populating the upper end of the distribution. There is a relation between G/ and , showing a critical break at ? 5 × 1010 L⊙ kpc?2. Below , G/ remains constant, ?0.32 cm3, and variations in are driven by the number density of star-forming regions within a galaxy, with no change in their PDR properties. Above , G/ increases rapidly with , signaling a departure from the typical PDR conditions found in normal star-forming galaxies toward more intense/harder radiation fields and compact geometries typical of starbursting sources.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-846-1-AA81D7
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35855]
专题	中国科学院国家天文台
作者单位	1.Department of Astronomy, Cornell University, Ithaca, NY 14853, USA 2.Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile; tanio.diaz@mail.udp.cl 3.Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA 4.Institute for Astronomy, Astrophysics, Space Applications & Remote Sensing, National Observatory of Athens, GR-15236, Penteli, Greece 5.University of Crete, Department of Physics, GR-71003, Heraklion, Greece 6.China-Chile Joint Center for Astronomy (CCJCA), Camino El Observatorio 1515, Las Condes, Santiago, Chile 7.National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, China 8.Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904, USA 9.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA 10.Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
推荐引用方式 GB/T 7714	Díaz-Santos,T.,Armus,L.,Charmandaris,V.,et al. A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies[J]. The Astrophysical Journal,2017,846(1).
APA	Díaz-Santos,T..,Armus,L..,Charmandaris,V..,Lu,N..,Stierwalt,S..,...&Surace,J. A..(2017).A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies.The Astrophysical Journal,846(1).
MLA	Díaz-Santos,T.,et al."A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies".The Astrophysical Journal 846.1(2017).