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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742449.0, MPI für Astronomie / Publikationen_mpia
The spatially resolved [CII] cooling line deficit in galaxies
Authors:Smith, J. D. T.; Croxall, K.; Draine, B.; De Looze, I.; Sandstrom, K.; Armus, L.; Beirão, P.; Bolatto, A.; Boquien, M.; Brandl, B.; Crocker, A.; Dale, D. A.; Galametz, M.; Groves, B.; Helou, G.; Herrera-Camus, R.; Hunt, L.; Kennicutt, R.; Walter, F.; Wolfire, M.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal
Start Page:id. 5 (12 pp)
Audience:Not Specified
Abstract / Description: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.
Free Keywords:dust; extinction; galaxies: ISM; infrared: galaxies; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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