The Einstein Observatory Medium Sensitivity Survey - Optical identifications for a complete sample of X-ray sources

Details The Einstein Observatory Medium Sensitivity Survey - Optical identifications for a complete sample of X-ray sources The Einstein Observatory Medium Sensitivity Survey - Optical identifications for a complete sample of X-ray sources

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..458s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. 458-477.

Astronomy and Astrophysics

Astrophysics

124

Milky Way Galaxy, Spectrum Analysis, Visible Spectrum, X Ray Sources, Active Galactic Nuclei, Galactic Clusters, Heao 2, Quasars, Red Shift, Spectral Line Width, Stellar Spectra

Scientific paper

It is suggested that virtually all the X-ray sources in the Einstein Observatory's Medium Sensitivity Survey flux range can be identified with objects visible on the POSS, on the basis of the complete identification of all sources north of -25 deg declination. There is no evidence for a significant population of 'blank field' X-ray sources at this flux level, and therefore no evidence for any new X-ray source class with very high L(x)/L(v). Most of the quasars detected in the present survey are spectroscopically similar to optical or radio-selected quasars. About 25 percent of the quasar sample, however, had reddish colors, and permitted lines dominated by a narrow-line component. These objects form a second sequence of active galactic nuclei, distinct in their optical properties from the broad line objects.

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