Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214...35b&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 35-37.
Astronomy and Astrophysics
Astronomy
10
Radio Sources (Astronomy), Spaceborne Astronomy, X Ray Astronomy, Astronomical Maps, Astronomical Netherlands Satellite, Extragalactic Radio Sources, Galactic Clusters, Galactic Radiation, Satellite Observation
Scientific paper
X-ray observations of 3U 1957+40 (Cyg A region) by the two instruments on board ANS are reported. The intensity recorded by the Utrecht instrument (SXX) is consistent with the Uhuru strength. The spectrum and intensity also agree with results from the Copernicus satellite observations. However, no measurable flux was recorded by the Cambridge instrument (HXX) in the same energy range as SXX but with a smaller field of view. Thus if 3U 1957+40 is a point source, its declination is not within 6 arcmin of Cyg A. Alternatively, the emission region may be extended and originate in the cluster of galaxies near Cyg A.
Brinkman Albert C.
den Boggende Antonius J. F.
Grindlay Jonathan
Gursky Herbert
Heise Jaret
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