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Short term variation of Cyg X-1 in the hard x-ray region

Journal Article:

Abstract

Cyg X-1 is a peculiar celestial body considered to be a close binary system of a black hole and a blue super-giant star. It is presently known that the time fluctuation of Cyg X-1 is considerably complex, ranging from seconds to days or months. Of these variation, attention has been paid to the short time variation in relation to the black hole theory. Observations of fluctuations in the order of second have been limited to soft X-ray (20 keV or more) so far, because great technical difficulties are involved due to the low intensity of hard X-ray. The present investigation is based on the fluctuations in the order of second in hard X-ray, and was conducted by employing an unprecedented large area X-ray telescope. The text describes on the brief history of the short time fluctuation, explains the experimental plan, X-ray detecting system, flight of a balloon and the analyses and discussions of fluctuation factor by variation function method, and gives the analysis data and conclusion. The observations resulted in the fact that the fluctuations in the order of second were small at 20 to 30 keV, but become large when energy is higher or lower than this value. The  More>>
Authors:
Doi, Kosei [1] 
  1. Tokyo Univ. (Japan). Inst. of Space and Aeronautical Science
Publication Date:
Aug 01, 1978
Product Type:
Journal Article
Reference Number:
AIX-10-489468; EDB-80-030943
Resource Relation:
Journal Name: Tokyo Daigaku Uchu Koku Kenkyusho Hokoku; (Japan); Journal Volume: 14:3
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BINARY STARS; HARD X RADIATION; COSMIC X-RAY SOURCES; VARIATIONS; BALLOONS; BLACK HOLES; CORRELATIONS; PROPORTIONAL COUNTERS; SUPERGIANT STARS; VARIABLE STARS; AIRSHIPS; COSMIC RAY SOURCES; ELECTROMAGNETIC RADIATION; GIANT STARS; IONIZING RADIATIONS; MEASURING INSTRUMENTS; RADIATION DETECTORS; RADIATIONS; STARS; X RADIATION; 640103* - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987); 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
OSTI ID:
5637011
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: CODEN: TDUKA
Submitting Site:
INIS
Size:
Pages: 1031-1052
Announcement Date:

Journal Article:

Citation Formats

Doi, Kosei. Short term variation of Cyg X-1 in the hard x-ray region. Japan: N. p., 1978. Web.
Doi, Kosei. Short term variation of Cyg X-1 in the hard x-ray region. Japan.
Doi, Kosei. 1978. "Short term variation of Cyg X-1 in the hard x-ray region." Japan.
@misc{etde_5637011,
title = {Short term variation of Cyg X-1 in the hard x-ray region}
author = {Doi, Kosei}
abstractNote = {Cyg X-1 is a peculiar celestial body considered to be a close binary system of a black hole and a blue super-giant star. It is presently known that the time fluctuation of Cyg X-1 is considerably complex, ranging from seconds to days or months. Of these variation, attention has been paid to the short time variation in relation to the black hole theory. Observations of fluctuations in the order of second have been limited to soft X-ray (20 keV or more) so far, because great technical difficulties are involved due to the low intensity of hard X-ray. The present investigation is based on the fluctuations in the order of second in hard X-ray, and was conducted by employing an unprecedented large area X-ray telescope. The text describes on the brief history of the short time fluctuation, explains the experimental plan, X-ray detecting system, flight of a balloon and the analyses and discussions of fluctuation factor by variation function method, and gives the analysis data and conclusion. The observations resulted in the fact that the fluctuations in the order of second were small at 20 to 30 keV, but become large when energy is higher or lower than this value. The most natural explanation available for this result may be that it is essentially spectrum fluctuation, being inverse correlation in higher and lower energies. Physical meaning of such spectrum fluctuation is considered in connection with precipitating disk model around a black hole.}
journal = {Tokyo Daigaku Uchu Koku Kenkyusho Hokoku; (Japan)}
volume = {14:3}
journal type = {AC}
place = {Japan}
year = {1978}
month = {Aug}
}