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

Abstract

We present an analysis of [OI]63, [OIII]88, [NII]122 and [CII]158 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 (GOALS). We find pronounced declines -deficits- of line-to-FIR-continuum emission for [NII]122, [OI]63 and [CII]158 as a function of FIR color and infrared luminosity surface density, ${\Sigma }_{\mathrm{IR}}$. The median electron density of the ionized gas in LIRGs, based on the [NII]122/[NII]205 ratio, is $n_{\mathrm{e}}$ = 41 cm${}^{-3}$. We find that the dispersion in the [CII]158 deficit of LIRGs is attributed to a varying fractional contribution of photo-dissociation-regions (PDRs) to the observed [CII]158 emission, f([CII]PDR) = [CII]PDR/[CII], which increases from ~60% to ~95% in the warmest LIRGs. The [OI]63/[CII]158PDR ratio is tightly correlated with the PDR gas kinetic temperature in sources where [OI]63 is not optically-thick or self-absorbed. For each galaxy, we derive the average PDR hydrogen density, $n_{\mathrm{H}}$, and intensity of the interstellar radiation field, in units of G${}_0$, and find G${}_0$/$n_{\mathrm{H}}$ ratios ~0.1-50 cm${}^3$, with ULIRGs populating the upper end of the distribution. There is a relation between G${}_0$/$n_{\mathrm{H}}$ and ${\Sigma }_{\mathrm{IR}}$, showing a critical break at ${\Sigma }_{\mathrm{IR}}^{\star }$ ~ 5 x 10${}^{10}$ Lsun/kpc${}^2$. Below ${\Sigma }_{\mathrm{IR}}^{\star }$, G${}_0$/$n_{\mathrm{H}}$ remains constant, ~0.32 cm${}^3$, and variations in ${\Sigma }_{\mathrm{IR}}$ are driven by the number density of star-forming regions within a galaxy, with no change in their PDR properties. Above ${\Sigma }_{\mathrm{IR}}^{\star }$, G${}_0$/$n_{\mathrm{H}}$ increases rapidly with ${\Sigma }_{\mathrm{IR}}$, signaling a departure from the typical PDR conditions found in normal star-forming galaxies towards more intense/harder radiation fields and compact geometries typical of starbursting sources.

23 pages, 12 figures. Submitted to ApJ, including 2nd round of referee comments. Data tables can be found at: http://goals.ipac.caltech.edu/ and will also appear on the electronic version of the journal

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