Statistics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..181p&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Statistics
1
Scientific paper
Using multi-wavelength data from the Spitzer Infrared Nearby Galaxies Survey (SINGS) and a new empirical method for deriving attenuation of infrared-selected star-forming regions, we investigate the statistics of obscured star formation in a sample of 18 nearby galaxies. We find that the galaxies in this sample are in general very well-behaved in terms of their attenuation properties on 500 pc scales. There is no evidence in this work for a large sub-population of highly-obscured star-forming regions on these scales; the regions in the highly-obscured tail of the attenuation distribution (A_{Hα} > 3.3) make up only ˜5% of the sample of more than 1100 regions. These highly-obscured cases are generally the central regions of luminous galaxies with high overall attenuation, are themselves somewhat more luminous, but are not otherwise remarkable. We also find that a majority of the galaxies show decreasing radial trends in Hα attenuation. The small fraction of highly-obscured regions seen in this sample of normal, star-forming galaxies suggests that on these large spatial scales the timescale for significant dispersal or break up of optically thick dust clouds is short relative to the lifetime of a typical star-forming region.
Kennicutt Robert C.
Prescott Moire K. M.
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