NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T04:47:32 PDT
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For refcode 1991AJ....102.1663C:
Retrieve 155 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1991AJ....102.1663C RADIO PROPERTIES OF EXTRAGALACTIC IRAS SOURCES J.J. CONDON National Radio Astronomy Observatory, Edgemont Road, Charlottesville, Virginia 22903 J. J. BRODERICK Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 Received 17 June 1991; revised 7 August 1991 ABSTRACT Extragalactic sources with S_60 microns_ =>0.2 Jy and {alpha} (12 microns, 60 microns)=> 0 from the IRAS Faint Source Catalog Version 1 covering |b| > 50^deg^ were identified by position coincidence with radio sources stronger than S = 25 mJy and lying north of {delta} = + 5^deg^ on the Green Bank 4.85 GHz sky maps. There are N= 7702 far-infrared (FIR) sources and N~1.3 X 10^4^ radio sources in this {OMEGA}~1.28 sr area. Published VLA maps, new 4.86 GHz VLA maps made with 15 arcsec resolution, and accurate optical positions were used to confirm 122 of these candidate identifications. Normal and starburst spiral galaxies comprise 97% of the FIR flux-limited sample. Their logarithmic FIR/radio flux- density ratio distribution is quite narrow ({sigma}_q_ = 0.14+/-0.02) with mean <q> = 2.75+/-0.03, and all are relatively cool [{alpha}(25 microns, 60 microns) ~> + 1.5] FIR sources. Radio-loud "monsters" with q < 2.25 dominate the radio emission from about 2% of the FIR source sample, and radio-quiet monsters are responsible for the FIR emission from < 1% of the FIR sample. The FIR emission from the two BL Lac objects identified, B2 1308+32 and OQ 530, is nonthermal; the remaining identifications all appear to be thermal FIR sources. A significant fraction of the thermal FIR sources in radio-loud galaxies are so warm [{alpha}(25 microns, 60 microns) < + 1.5] that their heating sources are probably monsters, not starbursts. All of the radio-identified sources are optically identified, mostly with relatively bright nearby galaxies. There is no evidence in our sample for any new populations of high- redshift FIR sources, nonthermal sources with steep FIR/optical spectra, or dust-shrouded sources visible only at FIR and radio wavelengths.
Retrieve 155 NED objects in this reference.
Please click here for ADS abstract

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