Letter | Published:

Faint X-ray sources detected near COS B γ-ray positions

Nature volume 272, pages 699701 (20 April 1978) | Download Citation



THE Uhuru data has been superimposed with a point summation technique (PST) on the positions of the 11 unidentified COS B γ-ray sources1. For the other COS B sources, SAS 2 has identified CB185–5 with NP0532 (Crab pulsar) and CG263–2 with the Vela pulsar2–4. We describe here first, the reanalysis by the PST of three weak 4U sources which lie within COS B error circles; second, a survey of the remaining COS B positions which has uncovered a new X-ray source within the CG075+0 error circle; and third, the results of an investigation of the region surrounding CG195+4 and CG189+1.

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  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138

    • P. F. JULIEN
    •  & H. F. HELMKEN


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