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19 April 2024 |
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Pah and Mid-IR Luminosities as Measures of Star-Formation Rate in Spitzer First Look Survey Galaxies | | H. Wu
; C. Cao
; C.-N. Hao
; F.-S. Liu
; J.-L. Wang
; X.-Y. Xia
; Z.-G. Deng
; C.-K.-S. Young
; | | Date: |
12 Sep 2005 | | Journal: | ApJ, 632, L79, 2005 | | Affiliation: | 1 and 5) ( NAOC Department of Physics, Tianjin Normal University College of Physical Sciences, Graduate School, CAS Department of Physics, University of Hong Kong | | Abstract: | We present evidence that the 8 $mu$m (dust) and 24 $mu$m luminosities of star-forming galaxies are both strongly correlated with their 1.4 GHz and H$alpha$ luminosities over a range in luminosity of two-to-three orders of magnitude. At the bright end, the correlations are found to be essentially linear over a luminosity range of about two orders of magnitude (corresponding to star-formation rates of several-tenths to several tens of solar masses per year). However, at the faint end, there appears to be a slope change for dwarf galaxies, possibly due to the lower dust-to-gas ratios and lower metallicities of the dwarfs. The correlations suggest that PAH features and mid-IR continuum emissions are good measures of the star formation rates of galaxies, and we present calibrations of star-formation rates based on existing radio and H$alpha$ relations. Our findings are based on a sample of star-forming galaxies selected from the main field of the Spitzer First Look Survey with the aid of spectroscopic data from the Sloan Digital Sky Survey and VLA 1.4 GHz data. | | Source: | arXiv, astro-ph/0509281 | | Services: | Forum | Review | PDF | Favorites | |
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