ATTENZIONE! IL REPOSITORY E’ APERTO ESCLUSIVAMENTE ALL’IMMISSIONE DEI RAPPORTI TECNICI (COLLEZIONE 4.01). NON E’ POSSIBILE INSERIRE PRODOTTI IN TUTTE LE ALTRE COLLEZIONI, A CAUSA DI PROBLEMI TECNICI. THE REPOSITORY IS OPEN EXCLUSIVELY FOR THE SUBMISSION OF TECHNICAL REPORTS (COLLECTION 4.01). SUBMISSIONS TO ALL OTHER COLLECTIONS ARE TEMPORARILY UNAVAILABLE, DUE TO TECHNICAL ISSUES.
 

The Spatially Resolved [CII] Cooling Line Deficit in Galaxies

Journal
Date Issued
2017
Author(s)
Smith, J. D. T.
•
Croxall, Kevin
•
Draine, Bruce
•
De Looze, Ilse
•
Sandstrom, Karin
•
Armus, Lee
•
Beirão, Pedro
•
Bolatto, Alberto
•
Boquien, Mederic
•
Brandl, Bernhard
•
Crocker, Alison
•
Dale, Daniel A.
•
Galametz, Maud
•
Groves, Brent
•
Helou, George
•
Herrera-Camus, Rodrigo
•
•
Kennicutt, Robert
•
Walter, Fabian
•
Wolfire, Mark
DOI
Abstract
We present [C II] 158 μm measurements from over 15,000 resolved regions within 54 nearby galaxies of the Kingfish program to investigate the so-called [C II] “line-cooling deficit” long known to occur in galaxies with different luminosities. The [C II]/TIR ratio ranges from above 1% to below 0.1% in the sample, with a mean value of 0.48 ± 0.21%. We find that the surface density of 24 μm emission dominates this trend, with [C II]/TIR dropping as ν {I}ν (24 μ {{m}}) increases. Deviations from this overall decline are correlated with changes in the gas-phase metal abundance, with higher metallicity associated with deeper deficits at a fixed surface brightness. We supplement the local sample with resolved [C II] measurements from nearby luminous infrared galaxies and high-redshift sources from z = 1.8-6.4, and find that star formation rate density drives a continuous trend of deepening [C II] deficit across six orders of magnitude in {{{Σ }}}{{sfr}}. The tightness of this correlation suggests that an approximate {{{Σ }}}{{sfr}} can be estimated directly from global measurements of [C II]/TIR, and a relation is provided to do so. Several low-luminosity active galactic nucleus (AGN) hosts in the sample show additional and significant central suppression of [C II]/TIR, but these deficit enhancements occur not in those AGNs with the highest X-ray luminosities, but instead those with the highest central starlight intensities. Taken together, these results demonstrate that the [C II] line-cooling line deficit in galaxies likely arises from local physical phenomena in interstellar gas.
Volume
834
Issue
1
Start page
5
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...834....5S
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

2017Smith_2017_ApJ_834_5.pdf

Description
PDF editoriale
Size

1.31 MB

Format

Adobe PDF

Checksum (MD5)

b5011bdfa15ed33ca2dafb74ebd22291