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Title:
The MIT/OSO 7 catalog of X-ray sources - Intensities, spectra, and long-term variability
Authors:
Markert, T. H.; Laird, F. N.; Clark, G. W.; Hearn, D. R.; Sprott, G. F.; Li, F. K.; Bradt, H. V.; Lewin, W. H. G.; Schnopper, H. W.; Winkler, P. F.
Affiliation:
AA(MIT, Cambridge, Mass.), AB(MIT, Cambridge, Mass.), AC(MIT, Cambridge, Mass.), AD(MIT, Cambridge, Mass.), AE(MIT, Cambridge, Mass.), AF(MIT, Cambridge, Mass.), AG(MIT, Cambridge, Mass.), AH(MIT, Cambridge, Mass.), AI(MIT, Cambridge, Mass.)
Publication:
Astrophysical Journal Supplement Series, vol. 39, Apr. 1979, p. 573-632. (ApJS Homepage)
Publication Date:
04/1979
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astronomical Catalogs, Oso-7, Satellite Observation, X Ray Astronomy, Graphs (Charts), Light Curve, Long Term Effects, Spaceborne Astronomy, Spectral Bands, Tables (Data)
DOI:
10.1086/190587
Bibliographic Code:
1979ApJS...39..573M

Abstract

This 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.

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