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Published January 1, 2017 | Published
Journal Article Open

The Local [C ii] 158 μm Emission Line Luminosity Function

Abstract

We present, for the first time, the local [C ii] 158 μm emission line luminosity function measured using a sample of more than 500 galaxies from the Revised Bright Galaxy Sample. [C ii] luminosities are measured from the Herschel PACS observations of the Luminous Infrared Galaxies (LIRGs) in the Great Observatories All-sky LIRG Survey and estimated for the rest of the sample based on the far-infrared (far-IR) luminosity and color. The sample covers 91.3% of the sky and is complete at S_(60 μm) > 5.24 Jy. We calculate the completeness as a function of [C ii] line luminosity and distance, based on the far-IR color and flux densities. The [C ii] luminosity function is constrained in the range ~10^(7–9) L_⊙ from both the 1/V_(max) and a maximum likelihood methods. The shape of our derived [C ii] emission line luminosity function agrees well with the IR luminosity function. For the CO(1-0) and [C ii] luminosity functions to agree, we propose a varying ratio of [C ii]/CO(1-0) as a function of CO luminosity, with larger ratios for fainter CO luminosities. Limited [C ii] high-redshift observations as well as estimates based on the IR and UV luminosity functions are suggestive of an evolution in the [C ii] luminosity function similar to the evolution trend of the cosmic star formation rate density. Deep surveys using the Atacama Large Millimeter Array with full capability will be able to confirm this prediction.

Additional Information

© 2016. The American Astronomical Society. Received 2016 July 22; revised 2016 November 7; accepted 2016 November 9; published 2016 December 28. We wish to thank the referee for helpful comments which improved the content and presentation of this paper. SH wishes to thank Iary Davidzon and Hooshang Nayyeri for very useful discussions. AF acknowledges support from the Swiss National Science Foundation. T.D.-S. acknowledges support from ALMA-CONICYT project 31130005 and FONDECYT regular project 1151239.

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