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Article
4U0241+61: a luminous low-redshift QSO
A PRECISE (30″) celestial position for the faint (1.8 µJy, 2–11 keV) X-ray source 4U0241+61 (ref. 1) and its identification at optical and radio wavelengths are reported here. Despite its low galactic latitude (b
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Article
Positions of galactic X-ray sources: 55° < lII < 320°
PRECISE (20–40″) celestial positions of 10 galactic X-ray sources in the region 55° < lII < 320° are reported here. These positions were measured with the rotating modulation collimator detectors on the SAS-3 X-r...
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Article
Positions of galactic X-ray sources: −20° < lII < + 6°
THE precise (20–60″) positions of nine X-ray sources, in the vicinity of the galactic centre are reported here. The data were obtained as part of the comprehensive survey of the galactic plane performed with t...
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Article
Discovery of an X-ray QSO
WE report here the discovery of an X-ray emitting QSO, the first to be initially identified from X-ray observations. Previously, the only QSO known to be an X-ray source was 3C273 (refs 1 and 2). The new QSO h...
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Article
Positions of galactic X-ray sources: 320° < lII <340°
PRECISE (20–40″) positions of seven X-ray sources in the celestial region 320° < lII < 340° are reported here. These include a recurrent transient X-ray source (MX1608–52; refs 1–4) and a source 2S1553–542 (ref. ...
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Article
Positions of galactic X-ray sources: 0° < lII < 20°
PRECISE (20–25″) positions of six X-ray sources located in the galactic bulge, GX1+4, GX9+9, GX3+1, GX+1, G%13+1 and GX17+2 are reported here. The data were taken as part of the survey of the galactic plane pe...
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Article
Positions of galactic X-ray sources: 20° < lII < 55°
Precise positions, determined with data from the SAS-3 X-ray observatory, are presented for eight galactic plane X-ray sources (Aq1 X-1, Ser X-1, 3U1956 + 11, 3U1822−00, 3U1915−05, A1845−02, A1850−08, A1905+00...