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标题：The Reliability of [C II] as a Star Formation Rate Indicator
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作者：Ilse De Looze ; Maarten Baes ; Jacopo Fritz 等
期刊名称：Open Astronomy
电子版ISSN：2543-6376
出版年度：2011
卷号：20
期号：3
页码：463-467
DOI：10.1515/astro-2017-0320
语种：English
出版社：Walter de Gruyter GmbH & Co. KG
摘要：AbstractWe present a calibration of the star formation rate (SFR) as a function of the [C II] 157.74 μm luminosity for a sample of 24 star-forming galaxies in the nearby universe. In order to calibrate the SFR against the line luminosity, we rely on both GALEX FUV data, which is an ideal tracer of the unobscured star formation, and Spitzer MIPS 24 μm, to probe the dust-enshrouded fraction of star formation. For this sample of normal star-forming galaxies, the [C II] luminosity correlates well with the star formation rate. However, the extension of this relation to more quiescent (Hα EW≤10 Å) or ultra luminous galaxies (LTIR≥1012L⊙) should be handled with caution, since these objects show a non-linearity in the L[C II]-to-LFIRratio as a function of LFIR(and thus, their star formation activity). Two possible scenarios can be invoked to explain the tight correlation between the [C II] emission and the star formation activity on a global galaxy-scale. The first interpretation could be that the [C II] emission from photo dissociation regions arises from the immediate surroundings of actively star-forming regions and contributes a more or less constant fraction on a global galaxy-scale. Alternatively, we consider the possibility that the [C II] emission is associated to the cold interstellar medium, which advocates an indirect link with the star formation activity in a galaxy through the Schmidt law.
关键词：Keywordsgalaxiesstar formation ISMlines and bandsinfraredgalaxies ultravioletgalaxies