Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92...94c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 92, July 1986, p. 94-102. Research supported by VPI Educational Foundation.
Astronomy and Astrophysics
Astronomy
61
Extragalactic Radio Sources, Infrared Astronomy Satellite, Point Sources, Spaceborne Astronomy, Astronomical Catalogs, Astronomical Models, Histograms, Spiral Galaxies, Statistical Analysis
Scientific paper
Radio identifications of IRAS point sources in a 1.78 sr area with b > 30° were made from the Green Bank 1400 MHz survey maps. The 365 "hot" infrared sources with S12μ > S60μ and S12μ ≥ 5 Jy (primary galactic stars) are not detectable radio sources. Nearly all of the "cool" high-latitude IRAS sources with S60μ ≥ S12μ are extragalactic. Their infrared and radio fluxes are strongly correlated. The 1400 MHz flux-density distribution of the 490 sources with S60μ ≥ S12μ and S60μ ≥ 2 Jy is significantly displaced from zero. Fifty-six of these 490 sources have individual identifications among the ≈6×103 discrete radio sources stronger than 0.13 Jy at 1400 MHz. All but one are in bright spiral galaxies and most have S60μ very large 2 Jy. Only about nine of the 2840 IRAS sources with S60μ ≥ S12μ and 2 > S60μ ≥ 0.5 Jy can be identified with any of the ≈3×103 radio sources stronger than 0.20 Jy at 1400 MHz. The fainter infrared-source identifications include optically bright quasars, BL Lac objects, Seyfert galaxies, and elliptical galaxies. No IRAS sources could be identified with distant elliptical radio galaxies. Thus even though the radio and infrared fluxes of most IRAS extragalactic sources are tightly correlated, complete samples of strong radio and infrared sources are almost completely disjoint, with ≤1% of the infrared sources being radio sources and <1% of the radio sources being infrared sources.
Broderick John J.
Condon James J.
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