We present Herschel/PACS observations of extended CII157.7\mum 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.
Description
[1405.3983] Extended [CII] Emission in Local Luminous Infrared Galaxies
%0 Generic
%1 diazsantos2014extended
%A Diaz-Santos, T.
%A Armus, L.
%A Charmandaris, V.
%A Stacey, G.
%A Murphy, E. J.
%A Haan, S.
%A Stierwalt, S.
%A Malhotra, S.
%A Appleton, P.
%A Inami, H.
%A Magdis, G. E.
%A Elbaz, D.
%A Evans, A. S.
%A Mazzarella, J. M.
%A Surace, J. A.
%A van der Werf, P. P.
%A Xu, C. K.
%A Lu, N.
%A Meijerink, R.
%A Howell, J. H.
%A Petric, A. O.
%A Veilleux, S.
%A Sanders, D. B.
%D 2014
%K cii fir infrared luminous sfr tracer
%T Extended CII Emission in Local Luminous Infrared Galaxies
%U http://arxiv.org/abs/1405.3983
%X We present Herschel/PACS observations of extended CII157.7\mum 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.
@misc{diazsantos2014extended,
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.},
added-at = {2014-05-19T09:36:09.000+0200},
author = {Diaz-Santos, T. and Armus, L. and Charmandaris, V. and Stacey, G. and Murphy, E. J. and Haan, S. and Stierwalt, S. and Malhotra, S. and Appleton, P. and Inami, H. and Magdis, G. E. and Elbaz, D. and Evans, A. S. and Mazzarella, J. M. and Surace, J. A. and van der Werf, P. P. and Xu, C. K. and Lu, N. and Meijerink, R. and Howell, J. H. and Petric, A. O. and Veilleux, S. and Sanders, D. B.},
biburl = {https://www.bibsonomy.org/bibtex/2f069e8cf485a40caf544fdc1260bc8ee/miki},
description = {[1405.3983] Extended [CII] Emission in Local Luminous Infrared Galaxies},
interhash = {b87fc45a0fba9f3433ad7edce4b659cd},
intrahash = {f069e8cf485a40caf544fdc1260bc8ee},
keywords = {cii fir infrared luminous sfr tracer},
note = {cite arxiv:1405.3983Comment: Accepted for publication in ApJ Letters. 5 pages, 2 figures},
timestamp = {2014-05-19T09:36:09.000+0200},
title = {Extended [CII] Emission in Local Luminous Infrared Galaxies},
url = {http://arxiv.org/abs/1405.3983},
year = 2014
}