Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 814, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/814/1/L6
Keywords
galaxies: star formation; gravitational lensing: strong; techniques: spectroscopic
Categories
Funding
- NASA [NAS 5-26555]
- Research Council of Norway
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We measure [C III] 1907, C III] 1909 angstrom emission lines in 11 gravitationally lensed star-forming galaxies at z similar to 1.6-3, finding much lower equivalent widths than previously reported for fainter lensed galaxies. While it is not yet clear what causes some galaxies to be strong C III] emitters, C III] emission is not a universal property of distant star-forming galaxies. We also examine C III] emission in 46 star-forming galaxies in the local universe, using archival spectra from GHRS, FOS, and STIS on HST and IUE. Twenty percent of these local galaxies show strong C III] emission, with equivalent widths < -5 angstrom. Three nearby galaxies show C III] emission equivalent widths as large as the most extreme emitters yet observed in the distant universe; all three are Wolf-Rayet galaxies. At all redshifts, strong C III] emission may pick out low-metallicity galaxies experiencing intense bursts of star formation. Such local C III] emitters may shed light on the conditions of star formation in certain extreme high-redshift galaxies.
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