Solar and cosmic X-rays above 7.7 keV

✍ Scribed by Hugh S. Hudson; Laurence E. Peterson; Daniel A. Schwartz

• Book ID: 104643604
• Publisher: Springer
• Year: 1969
• Tongue: English
• Weight: 485 KB
• Volume: 6
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00150945

✦ Synopsis

Since ils launch on March 8, 1967, the OSO-Ill has continuously observed solar and cosmic X-rays over the 7.7-210 keV range. The sun emits many impulsive X-ray bursts having fluxes several orders of magnitude above the background level of 8 • 10 -9 ergs(cm'-'-sec) -1 at 7.7 keV and characteristic times on the order of 5 rain. Ninety-five such events having fluxes :> 3 • 10 -5 crgs(cmZ-scc) '~ were detected in the period from March 8 to June 15, 1967. The cosmic X-ray source Lupus XR-I has been observed to have a power law spectral form and no significant time variations over a 40-day period. Upper limits have been obtained on the hard X-ray flux of the peculiar galaxy M 87.

* Our design was started in Oct. J 962, and frozen in Sept. 1963; unfnrtunately, the full impact of the discovery of" point and diffuse cosmic X-ray sources could not be incorporated in the final instrument.