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Extragalactic X-ray Sources and Associations of Galaxies

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Abstract

RESULTS from sounding rocket experiments, confirmed and extended by data from the UHURU satellite, have revealed the existence of cosmic X-ray sources at high galactic latitude which apparently coincide with well known external galaxies. The first of these reported was M87 (ref. 1) followed by NGC-5128 and 3C273 (ref. 2). More recently NGC1275 (refs. 3 and 4) and NGC4151 (ref. 4) have been reported to be X-ray sources. Finally, a source has been reported in the direction of the Coma Cluster which has not yet been associated with a single galaxy (paper presented by H. G., E. M. Kellogg, C. Leong, H. Tananbaum and R. Giacconi at Amer. Phys. Soc. Meeting, March/April 1971). The results from UHURU on these and other subjects are listed in Table 1.

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Authors and Affiliations

  1. American Science and Engineering, Cambridge, Massachusetts, 02142

    A. G. CAVALIERE, H. GURSKY & W. H. TUCKER

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  1. A. G. CAVALIERE
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  2. H. GURSKY
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  3. W. H. TUCKER
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CAVALIERE, A., GURSKY, H. & TUCKER, W. Extragalactic X-ray Sources and Associations of Galaxies. Nature 231, 437–438 (1971). https://doi.org/10.1038/231437a0

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