Abstract
Two experiments carried out recently at M.I.T. gave results which bear on the problems of extragalactic X-ray sources. One of these is the work of a group under the direction of Hale Bradt (Bradt et al., 1967), who used an attitude-controlled Aerobee rocket to scan a portion of the sky which included the radio galaxy M 87 (Virgo A). Among their detectors were two banks of argon-filled, 2 mil beryllium window proportional counters, each with an effective area of 350 cm2 and a mechanical collimator giving a 2°×20° FWHM field of view. The fields of view were crossed
so that their long directions made an angle of 60° with one another. Aspect was determined to within 5 min of arc by star photography.
This work was supported in part by the National Aeronautics and Space Administration under Contracts NSR22-009-129 and NsG-386, and in part by the U.S. Atomic Energy Commission under contract AT(30-l)-2098.
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References
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Clark, G.W. (1968). Recent Results on Extragalactic Cosmic X-Ray Sources from Rocket and Balloon Flights. In: Perek, L. (eds) Highlights of Astronomy. International Astronomical Union / Union Astronomique Internationale, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3417-3_15
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