Outliers of the FIR-Radio Correlation: Beginning and End of a Starburst?

Details Outliers of the FIR-Radio Correlation: Beginning and End of a Starburst? Outliers of the FIR-Radio Correlation: Beginning and End of a Starburst?

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20410v&link_type=abstract

Spitzer Proposal ID #20410

Physics

Scientific paper

We have identified a sample of 31 spectroscopically classified star-forming galaxies in the Sloan Digital Sky Survey 2DR that significantly deviate from the FIR-radio correlation, as being either radio-deficient or FIR-deficient. One possibility is that these outliers are in a specific evolutionary phase, the beginning or the end of a starburst. Early on they would lack radio emission since no supernovae have gone off yet, at the fading stage they would be bright in radio, since the last population of cosmic rays accelerated by supernovae diffuses out in ~10 Myr, while they would lack FIR emission since they miss a population of hot stars to heat up their dust. We have started a multiwavelength study (UV, radio and H-alpha) to investigate the nature of these potentially very interesting sources. We propose to obtain high quality infrared observations at 24, 70, and 160 microns for this sample of galaxies in order to understand the reason of their anomalous behaviour.

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