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M.I.T. studies of transient X-ray phenomenaA variety of transient X-ray phenomena have been studied. Data from the OSO-7 satellite reveal both long and short time-scale transients. Extensive observations have been made of the Lupus X-ray Nova (3U1543-47) and GX339-4(MX 1658-48) which may represent a very different type of transient source. A unique, intense X-ray flare lasting ten minutes was also recorded, and the X-ray emission from the active galaxy Cen A was found to vary significantly over a period of several days. In a recent balloon flight the Crab pulsar, NP0532, was observed to exhibit a transient pulsed component distinct from the usual main pulse and interpulse. A sounding-rocket experiment detected an ultrasoft transient X-ray source tentatively associated with SS Cygni, and preliminary results from SAS-3 show a very hard spectrum for the new source A0535 + 26. On the other hand, extensive OSO-7 null observations of both Type I and II supernovae and of the flaring radio star Algol make it unlikely that these types of objects are potent transient X-ray emitters.
Document ID
19760055451
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Canizares, C. R.
(MIT Cambridge, Mass., United States)
Date Acquired
August 8, 2013
Publication Date
June 1, 1976
Subject Category
Astronomy
Accession Number
76A38417
Funding Number(s)
CONTRACT_GRANT: NGL-22-009-015
CONTRACT_GRANT: NSR-22-009-654
CONTRACT_GRANT: NSF GP-31378
CONTRACT_GRANT: NGL-22-009-730
Distribution Limits
Public
Copyright
Other

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