EXTENDED [C II] EMISSION IN LOCAL LUMINOUS INFRARED GALAXIES

Journal Article · Tue Jun 10 04:00:00 EDT 2014 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/788/1/L17· OSTI ID:22365797

Díaz-Santos, T.; Armus, L.; Surace, J. A. ^[1]; Charmandaris, V. ^[2]; Stacey, G. ^[3]; Murphy, E. J. ^[4]; Haan, S. ^[5]; Stierwalt, S.; Evans, A. S. ^[6]; Malhotra, S. ^[7]; Appleton, P. ^[8]; Inami, H. ^[9]; Magdis, G. E. ^[10]; Elbaz, D. ^[11]; Mazzarella, J. M.; Xu, C. K.; Lu, N.; Howell, J. H. ^[12]; Van der Werf, P. P.; others, and

---

1. Spitzer Science Center, California Institute of Technology, MS 220-6, Pasadena, CA 91125 (United States)
2. Department of Physics, University of Crete, GR-71003 Heraklion (Greece)
3. Department of Astronomy, Cornell University, Ithaca, NY 14853 (United States)
4. Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
5. CSIRO Astronomy and Space Science, Marsfield, NSW 2122 (Australia)
6. Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904 (United States)
7. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States)
8. NASA Herschel Science Center, IPAC, California Institute of Technology, MS 100-22, Cech, Pasadena, CA 91125 (United States)
9. National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States)
10. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom)
11. Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu, CNRS, Universite Paris Diderot, Saclay, F-91191 Gif-sur-Yvette (France)
12. Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125 (United States)

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{sup –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{sub 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{sub IR} with measurements of high-redshift starbursting IR-luminous galaxies.

• OSTI ID: 22365797
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 788; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CARBON IONS
COMPARATIVE EVALUATIONS
DENSITY
DISSOCIATION
FAR INFRARED RADIATION
GALAXIES
GALAXY NUCLEI
LUMINOSITY
RED SHIFT
SKY
STARS
SURFACES