History of X-Ray Transients as Seen by Vela, 1969?1979

Autor: R. D. Belian, W. D. Evans, W. C. Priedhorsky, J. Terrell, J. P. Conner
Rok vydání: 1984
Předmět:
Zdroj: Annals of the New York Academy of Sciences. 422:282-283
ISSN: 1749-6632
0077-8923
DOI: 10.1111/j.1749-6632.1984.tb23358.x
Popis: During the 10-year lifetime of the x-ray detectors, the Vela spacecraft provided data on many new types of sources. Cen X-4, an exceedingly bright x-ray transient, was observed in the summer of 1969, shortly after launch, and did not return to the x-ray sky until May 1979, when it was again observed by Vela 5B. This source also produced the first of many x-ray bursts detected by Vela, the bright, hard, precursor observed on 7 July 1969. The vela gamma-ray detectors revealed the new phenomenon of gamma-ray bursts. It has recently been found that at least two gamma-ray bursts were also detected by the x-ray counters. The data produced by Vela 5B over the 7-year period May 1969 - June 1976, during which real-time tracking was reasonably complete, have been put into the form of a series of 10-day x-ray sky maps. Although the Vela x-ray detectors were relatively small (27 cm/sup 2/ effective area), they were sensitive enough to yield good data on Cen A (NCC 5128) during the period 1973-1975 when it was unusually bright and active. The Vela data show that Cen A often changed dramatically in intensity in less than 10 days. 11 references.
Databáze: OpenAIRE
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