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מאמרים קשורים
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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הכנס מאמר חדש
לינקים קשורים
הכנס לינק חדש
משמש של הקבוצה הבאה
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | נחש |
| התרוממות ימנית: | 15h36m00.75s |
| סירוב: | +00°16'07.5" |
| גודל גלוי: | 9.23 |
| תנועה נכונה: | 9.1 |
| תנועה נכונה: | -54 |
| B-T magnitude: | 9.904 |
| V-T magnitude: | 9.286 |
קטלוגים וכינוים:
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INHABITED SKY
