NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The MIT/OSO 7 catalog of X-ray sources - Intensities, spectra, and long-term variabilityThis paper is a summary of the observations of the cosmic X-ray sky performed by the MIT 1-40-keV X-ray detectors on OSO 7 between October 1971 and May 1973. Specifically, mean intensities or upper limits of all third Uhuru or OSO 7 cataloged sources (185 sources) in the 3-10-keV range are computed. For those sources for which a statistically significant (greater than 20) intensity was found in the 3-10-keV band (138 sources), further intensity determinations were made in the 1-15-keV, 1-6-keV, and 15-40-keV energy bands. Graphs and other simple techniques are provided to aid the user in converting the observed counting rates to convenient units and in determining spectral parameters. Long-term light curves (counting rates in one or more energy bands as a function of time) are plotted for 86 of the brighter sources.
Document ID
19790049763
Document Type
Reprint (Version printed in journal)
Authors
Markert, T. H. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Laird, F. N. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Clark, G. W. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Hearn, D. R. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Sprott, G. F. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Li, F. K. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Bradt, H. V. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Lewin, W. H. G. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Schnopper, H. W. (MIT Cambridge, Mass., United States)
Winkler, P. F. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1979
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 39
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NSG-5198
CONTRACT_GRANT: NAS5-11082
Distribution Limits
Public
Copyright
Other