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http://hdl.handle.net/2445/128269
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DC Field | Value | Language |
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dc.contributor.author | Díaz-Santos, T. | - |
dc.contributor.author | Armus, L. | - |
dc.contributor.author | Charmandaris, V. | - |
dc.contributor.author | Lu, N. | - |
dc.contributor.author | Stierwalt, S. | - |
dc.contributor.author | Stacey, G. | - |
dc.contributor.author | Malhotra, Sunny | - |
dc.contributor.author | Werf, P.P.V.D. | - |
dc.contributor.author | Howell, J. H. | - |
dc.contributor.author | Privon, G. C. | - |
dc.contributor.author | Mazzarella, J. M. | - |
dc.contributor.author | Goldsmith, P. F. | - |
dc.contributor.author | Murphy, E. J. | - |
dc.contributor.author | Barcos-Muñoz, L. | - |
dc.contributor.author | Linden, S.T. | - |
dc.contributor.author | Inami, H. | - |
dc.contributor.author | Larson, K. L. | - |
dc.contributor.author | Evans, A. S. | - |
dc.contributor.author | Appleton, P. | - |
dc.contributor.author | Iwasawa, Kazushi | - |
dc.contributor.author | Lord, S. | - |
dc.contributor.author | Sanders, D. B. | - |
dc.contributor.author | Surace, J. A. | - |
dc.date.accessioned | 2019-02-14T15:15:42Z | - |
dc.date.available | 2019-02-14T15:15:42Z | - |
dc.date.issued | 2017-09-01 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2445/128269 | - |
dc.description.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, $\Sigma_{\rm IR}$. The median electron density of the ionized gas in LIRGs, based on the [NII]122/[NII]205 ratio, is $n_{\rm e}$ = 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, $n_{\rm H}$, and intensity of the interstellar radiation field, in units of G$_0$, and find G$_0$/$n_{\rm H}$ ratios ~0.1-50 cm$^3$, with ULIRGs populating the upper end of the distribution. There is a relation between G$_0$/$n_{\rm H}$ and $\Sigma_{\rm IR}$, showing a critical break at $\Sigma_{\rm IR}^{\star}$ ~ 5 x 10$^{10}$ Lsun/kpc$^2$. Below $\Sigma_{\rm IR}^{\star}$, G$_0$/$n_{\rm H}$ remains constant, ~0.32 cm$^3$, and variations in $\Sigma_{\rm IR}$ are driven by the number density of star-forming regions within a galaxy, with no change in their PDR properties. Above $\Sigma_{\rm IR}^{\star}$, G$_0$/$n_{\rm H}$ increases rapidly with $\Sigma_{\rm IR}$, 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. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Institute of Physics (IOP) | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.3847/1538-4357/aa81d7 | - |
dc.relation.ispartof | Astrophysical Journal, 2017, vol. 846, num. 1, p. 32 | - |
dc.relation.uri | https://doi.org/10.3847/1538-4357/aa81d7 | - |
dc.rights | (c) American Astronomical Society, 2017 | - |
dc.source | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) | - |
dc.subject.classification | Evolució de les galàxies | - |
dc.subject.classification | Astronomia infraroja | - |
dc.subject.other | Galaxies evolution | - |
dc.subject.other | Infrared astronomy | - |
dc.title | A Herschel/PACS Far-infrared line emission survey of local luminous infrared galaxies | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 680655 | - |
dc.date.updated | 2019-02-14T15:15:42Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
Files in This Item:
File | Description | Size | Format | |
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680655.pdf | 1.97 MB | Adobe PDF | View/Open |
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