Details

Autor(en) / Beteiligte

• Murphy, E J
• BREMSETH, J
• Mason, B S
• Condon, J J
• Schinnerer, E
• ANIANO, G
• Armus, L
• Helou, G
• Turner, J L
• Jarrett, T H

Titel

THE STAR FORMATION IN RADIO SURVEY: GBT 33 GHz OBSERVATIONS OF NEARBY GALAXY NUCLEI AND EXTRANUCLEAR STAR-FORMING REGIONS

Ist Teil von

• The Astrophysical journal, 2012-12, Vol.761 (2), p.1-22

Ort / Verlag

United States

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present 33 GHz photometry of 103 galaxy nuclei and extranuclear star-forming complexes taken with the Green Bank Telescope as part of the Star Formation in Radio Survey. Among the sources without evidence for an active galactic nucleus, and also having lower frequency radio data, we find a median thermal fraction at 33 GHz of approximately 76% with a dispersion of approximately 24%. For all sources resolved on scales [lap]0.5 kpc, the thermal fraction is even larger, being [gap]90%. This suggests that the rest-frame 33 GHz emission provides a sensitive measure of the ionizing photon rate from young star-forming regions, thus making it a robust star formation rate (SFR) indicator. Comparing the 33 GHz to total IR flux ratios as a function of the radio spectral index, measured between 1.7 and 33 GHz, we find that the ratio increases as the radio spectral index flattens which does not appear to be a distance effect.