Extended [C II] Emission in Local Luminous Infrared Galaxies
- Creators
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DÃaz-Santos, T.
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Armus, L.
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Charmandaris, V.
- Stacey, G.
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Murphy, E. J.
- Haan, S.
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Stierwalt, S.
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Malhotra, S.
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Appleton, P.
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Inami, H.
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Magdis, G. E.
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Elbaz, D.
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Evans, A. S.
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Mazzarella, J. M.
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Surace, J. A.
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van der Werf, P. P.
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Xu, C. K.
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Lu, N.
- Meijerink, R.
- Howell, J. H.
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Petric, A. O.
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Veilleux, S.
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Sanders, D. B.
Abstract
We present Herschel/PACS observations of extended [C II] 157.7 μm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios ≥4 × 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 interstellar medium of our Galaxy. The [C II] "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 [C II]/FIR ratios. We find an anti-correlation between [C II]/FIR and the luminosity surface density, Σ_(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 models and find that the slope of the correlation is much shallower than the model predictions. Finally, we compare the correlation found between [C II]/FIR and Σ_(IR) with measurements of high-redshift starbursting IR-luminous galaxies.
Additional Information
© 2014 The American Astronomical Society. Received 2014 March 6; accepted 2014 May 12; published 2014 May 27. We thank the anonymous referee for her/his useful comments and suggestions. We would like to thank Mark Wolfire for providing us with very useful insights regarding the PDR models. V.C. would like to acknowledge partial support from the EU F97 grant PIRSES-GA-2012-316788. This work is based on observations made with the Herschel Space Observatory, a European Space Agency Cornerstone Mission with science instruments provided by European-led Principal Investigator consortia and significant participation from NASA. The Spitzer Space Telescope is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and of NASA's Astrophysics Data System (ADS) abstract service.Attached Files
Published - 2041-8205_788_1_L17.pdf
Submitted - 1405.3983v1.pdf
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Additional details
- Eprint ID
- 47075
- Resolver ID
- CaltechAUTHORS:20140708-104804712
- Marie Curie Fellowship
- PIRSES-GA-2012-316788
- NASA
- 1407
- Created
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2014-07-08Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)