Time variations of hard X-rays from Sco X-1

Matsuoka, M. ; Fujii, M. ; Miyamoto, S. ; Nishimura, J. ; Oda, M. ; Ogawara, Y. ; Hayakawa, S. ; Kasahara, I. ; Makino, F. ; Tanaka, Y. ; Agarwal, P. C. ; Sreekantan, B. v. (1972) Time variations of hard X-rays from Sco X-1 Astrophysics and Space Science, 18 (2). pp. 472-490. ISSN 0004-640X

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Official URL: http://www.springerlink.com/content/p0727514r34gt2...

Related URL: http://dx.doi.org/10.1007/BF00645411


Simultaneous hard X-ray and optical observations of Sco X-1 were carried out on 1971 May 1 at Hyderabad, India, when Sco X-1 was optically bright. The X-ray intensity observed by balloon-borne counter telescopes increased in coincidence with optical enhancements, while the plasma temperature derived by fitting the X-ray spectrum in the energy range 20-40 keV to the thermal bremsstrahlung spectrum did not appreciably change over the whole period of observation.

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