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Record 19 of 178
M.I.T. studies of transient X-ray phenomena. [astronomical observations]
Author and Affiliation:
Canizares, C. R.(MIT, Cambridge, Mass., United States)
Abstract: A 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.
Publication Date: Jun 01, 1976
Document ID:
19760055451
(Acquired Dec 01, 1995)
Accession Number: 76A38417
Subject Category: ASTRONOMY
Document Type: Journal Article
Publisher Information: Netherlands
Contract/Grant/Task Num: NSR-22-009-654; NSF GP-31378; NGL-22-009-015; NGL-22-009-730
Financial Sponsor: NASA; United States
Organization Source: Massachusetts Inst. of Tech.; Cambridge, MA, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: OSO-7; X RAY ASTRONOMY; X RAY SOURCES; ACTIVE GALAXIES; COSMIC X RAYS; CRAB NEBULA; GALACTIC RADIATION; NOVAE; PULSARS; RADIANT FLUX DENSITY; RADIO STARS; SUPERNOVAE; X RAY SPECTRA
Imprint And Other Notes: (COSPAR, Symposium on Fast Transients in X- and Gamma-Rays, Varna, Bulgaria, May 29-31, 1975.) Astrophysics and Space Science, vol. 42, June 1976, p. 111-122.
Availability Source: Other Sources
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