Monday, 05-19-2014 Extended [CII

Emission in Local Luminous Infrared Galaxies]ā€‹
Extended [CII] Emission in Local Luminous Infrared Galaxies
Authors: T. Diaz-Santos, L. Armus, V. Charmandaris, G. Stacey, E. J. Murphy, S. Haan, S. Stierwalt, S. Malhotra, P. Appleton, H. Inami, G. E. Magdis, D. Elbaz, A. S. Evans, J. M. Mazzarella, J. A. Surace, P. P. van der Werf, C. K. Xu, N. Lu, R. Meijerink, J. H. Howell, A. O. Petric, S. Veilleux, D. B. Sanders
(Submitted on 15 May 2014)

Abstract: We present Herschel/PACS observations of extended [CII]157.7{\mu}m line emission detected on ~ 1 – 10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey (GOALS). We find that most of the extra-nuclear emission show [CII]/FIR ratios >~ 4 x 10^-3, larger than the mean ratio seen in the nuclei, and similar to those found in the extended disks of normal star-forming galaxies and the diffuse inter-stellar medium (ISM) of our Galaxy. The [CII] “deficits” found in the most luminous local LIRGs are therefore restricted to their nuclei. There is a trend for LIRGs with warmer nuclei to show larger differences between their nuclear and extra-nuclear [CII]/FIR ratios. We find an anti-correlation between [CII]/FIR and the luminosity surface density, {\Sigma}_IR, for the extended emission in the spatially-resolved galaxies. However, there is an offset between this trend and that found for the LIRG nuclei. We use this offset to derive a beam filling-factor for the star-forming regions within the LIRG disks of ~ 6 % relative to their nuclei. We confront the observed trend to photo-dissociation region (PDR) models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [CII]/FIR and {\Sigma}_IR with measurements of high-redshift starbursting IR-luminous galaxies.

Comments: Accepted for publication in ApJ Letters. 5 pages, 2 figures
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:1405.3983 [astro-ph.GA]
(or arXiv:1405.3983v1 [astro-ph.GA] for this version)

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