Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5416v&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #54.16; Bulletin of the American Astronomical Society, Vol. 33, p.867
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a study of the radio emission characteristics of a large, volume-limited sample of AGNs and starburst galaxies. The emission-line galaxies (ELGs) used in this comparison were taken from the KPNO International Spectroscopic Survey (KISS), which is a deep objective-prism survey which selects ELGs via the detection of the Hα emission-line. KISS consists of two survey strips, which cover a total area of ~128 square degrees. The radio sample is taken from the FIRST survey, which completely overlaps the KISS region. FIRST contains positions for all sources down to a radio flux limit of ~1 mJy. Using the accurate positions of the optical and radio sources, we carefully matched 178 radio sources to KISS ELGs. For 96.6% of the objects the positional agreement is within 2 arcsec. We present comparisons between the radio and optical fluxes, redshifts, optical color, emission line strengths, and radio and optical luminosities for the radio vs. non-radio detected ELGs. Radio ELGs make up the brighter and more luminous component of the ELG population. We also find that of the radio galaxies, 35.4% are AGNs, compared to 5.8% AGNs from the identified non-radio ELG population. We also present a volume-limited radio luminosity function out to z=0.1 and extrapolate the number density of radio galaxies to larger redshifts, with an eye toward understanding the nature of the sub-mJy radio galaxy population.
Salzer John Joseph
van Duyne Jeffrey
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