Recent Results on Extragalactic Cosmic X-Ray Sources from Rocket and Balloon Flights
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 1)
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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.
KeywordsComa Cluster Radio Galaxy Proportional Counter Crab Nebula Virgo Cluster
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- Garmire, G. (1967) private communication.Google Scholar
© I.A.U. 1968