From Galaxies to Galactic Nuclei: The Identification of FIRST Radio Sources in the ROSAT All-Sky Survey

Details From Galaxies to Galactic Nuclei: The Identification of FIRST Radio Sources in the ROSAT All-Sky Survey From Galaxies to Galactic Nuclei: The Identification of FIRST Radio Sources in the ROSAT All-Sky Survey

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1902l&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #19.02; Bulletin of the American Astronomical Society, Vol. 29, p.1241

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We present the results of the correlation of the ROSAT All-Sky Survey (RASS) and FIRST catalogs. The RASS catalog consists of ~ 80,000 soft X-ray sources with fluxes >=1-5x10(-13) ergs(-1) cm(-2) and the FIRST (Faint Images of the Radio Sky at Twenty centimeters) catalog currently consists of ~ 250,000 sources >=1mJy over 5,000deg(-2) of the high Galactic latitude sky. While counterparts to many X-ray sources are easily identified with single radio sources, we find that 40% of the X-ray sources in the correlation have more than one plausible radio counterpart. Many of these sources are radio doubles and triples exhibiting not only a core and lobes, but often highly complex radio morphologies. Other X-ray fields which contain multiple faint radio sources are likely associated with clusters. The FIRST catalog also provides excellent positions (<=1('') ) which enables unambiguous identification of optical counterparts which were chosen from Automatic Plate Machine (APM) scans of the POSSI photographic plates. We will discuss particularly those cases where the radio morphology is complex. While some nearby galaxies and stars are detected, the majority of these sources are AGN, including Broad and Narrow-line radio galaxies, BL Lacs, Seyferts and quasars. Because of the low radio flux density limit of the FIRST survey, many objects are radio-quiet even though they are radio- (and X-ray-) selected. Finally, we discuss the broadband radio, optical and X-ray spectral energy distribution of all identified sources and the transitions between various spectroscopic classes.

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