A Herschel/PACS Far-infrared Line Emission Survey of Local Luminous Infrared Galaxies
Díaz-Santos,T.1; Armus,L.2; Charmandaris,V.3,4; Lu,N.5,6; Stierwalt,S.7,8; Stacey,G.9; Malhotra,S.10; Werf,P. P. van der11; Howell,J. H.2; Privon,G. C.12,13; Mazzarella,J. M.14; Goldsmith,P. F.15; Murphy,E. J.8; Barcos-Mu?oz,L.8,16; Linden,S. T.7,8; Inami,H.17; Larson,K. L.2; Evans,A. S.7,8; Appleton,P.14,18; Iwasawa,K.19,20; Lord,S.21; Sanders,D. B.22; Surace,J. A.2
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
Keywordgalaxies: evolution galaxies: ISM galaxies: nuclei galaxies: starburst infrared: galaxies
WOS IDIOP:0004-637X-846-1-aa81d7
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile;
2.Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA
3.Institute for Astronomy, Astrophysics, Space Applications & Remote Sensing, National Observatory of Athens, GR-15236, Penteli, Greece
4.University of Crete, Department of Physics, GR-71003, Heraklion, Greece
5.China-Chile Joint Center for Astronomy (CCJCA), Camino El Observatorio 1515, Las Condes, Santiago, Chile
6.National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, China
7.Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904, USA
8.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
9.Department of Astronomy, Cornell University, Ithaca, NY 14853, USA
10.Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
11.Leiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands
12.Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
13.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
14.Infrared Processing and Analysis Center, MC 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA
15.Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
16.Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile
17.Centre de Recherche Astrophysique de Lyon, Universite de Lyon, Universite Lyon 1, CNRS, Observatoire de Lyon, 9 avenue Charles Andre, Saint-Genis Laval Cedex F-69561, France
18.NASA Herschel Science Center, IPAC, California Institute of Technology, MS 100-22, Cech, Pasadena, CA 91125, USA
19.Institut de Cincies del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Marti i Franques 1, E-08028 Barcelona, Spain
20.ICREA, Pg. Lluís Companys 23, E-08010 Barcelona, Spain
21.The SETI Institute, 189 Bernardo Avenue, Suite 100, Mountain View, CA 94043, USA
22.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
Recommended Citation
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).
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