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The Einstein Observatory Medium Sensitivity Survey - Optical identifications for a complete sample of X-ray sources
It is suggested that virtually all the X-ray sources in the EinsteinObservatory's Medium Sensitivity Survey flux range can be identifiedwith objects visible on the POSS, on the basis of the completeidentification of all sources north of -25 deg declination. There is noevidence for a significant population of 'blank field' X-ray sources atthis flux level, and therefore no evidence for any new X-ray sourceclass with very high L(x)/L(v). Most of the quasars detected in thepresent survey are spectroscopically similar to optical orradio-selected quasars. About 25 percent of the quasar sample, however,had reddish colors, and permitted lines dominated by a narrow-linecomponent. These objects form a second sequence of active galacticnuclei, distinct in their optical properties from the broad lineobjects.
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| Сазвежђа: | Змија |
| Ректацензија: | 15h36m00.75s |
| Deклинација: | +00°16'07.5" |
| Apparent магнитуда: | 9.23 |
| Proper motion RA: | 9.1 |
| Proper motion Dec: | -54 |
| B-T magnitude: | 9.904 |
| V-T magnitude: | 9.286 |
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