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Possible X-ray counterparts of γ-ray sources

Nature volume 272, pages 679681 (20 April 1978) | Download Citation

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Abstract

The error circles for the 10 unidentified COS-B γ-ray sources have been examined for X-ray emission. Three of these sources were found to contain known X-ray sources within their error circles: the positional uncertainty of CG135+1 contains 4U0241+61, CG312−1 contains MX1406−61 and 4U1416−62, and CG327−0 contains 2S1553minus;542. Spectra and variability, as well as positional coincidence, are used to argue that 4U0241+61, MX1406−61 and 2S1533−542 are possible X-ray counterparts to the γ-ray sources.

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Affiliations

  1. Laboratorio di Fisica Cosmica e Tecnologie Relative, CNR, Milano Instituto di Scienze Fisiche, Università degli Studi, Milano, Italy

    • L. Maraschi
  2. Department of Physics and Center for Space Research, Massachusetts Institute of Technology

    • T. Markert
    • , K. M. V. Apparao
    •  & H. Bradt
  3. Center for Astrophysics, Harvard College Observatory and Smithsonian Astrophysical Observatory

    • H. Helmken
  4. Physics Department, University of California, San Diego

    • W. Wheaton
    • , W. A. Baity
    •  & L. E. Peterson

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https://doi.org/10.1038/272679a0

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