The Low-Frequency Spectra of µJy Radio Sources in the 1046+59 Deep Field

Details The Low-Frequency Spectra of µJy Radio Sources in the 1046+59 Deep Field The Low-Frequency Spectra of µJy Radio Sources in the 1046+59 Deep Field

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5219k&link_type=abstract

American Astronomical Society, AAS Meeting #211, #52.19; Bulletin of the American Astronomical Society, Vol. 39, p.823

Astronomy and Astrophysics

Astronomy

Scientific paper

The 1046+59 Deep Field has been observed at 20- and 90-cm with the VLA and at 50-cm with the GMRT. These are the deepest images ever made at these wavelengths, with RMS noise levels of 2.7 micro-Jy and 70 micro-Jy respectively in the 20- and 90-cm images. The field has also been covered in submillimeter, NIR, optical, and X-ray bands. We investigate the low-frequency spectral properties of the field's micro-Jy radio population through a stacking analysis of 20-cm selected sources. We find evidence for a flattening of the radio spectrum at low frequencies, with 90/20-cm spectral indexes of 0.5. There is also some evidence that higher luminosity sources may have flatter spectral indexes than their lower luminosity counterparts. Free-free absorption seems the most likely mechanism for this flattening, and we discuss the implications of the presence of large volumes of ionized gas on scenarios for galaxy evolution. Finally, we compare the spectra of the micro-Jy sources to examples of ULIRGs and star-forming galaxies in the local universe.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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