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Stellar contributions to the hard X-ray galactic ridge
Worrall, D. M.; Marshall, F. E.
AA(California, University, La Jolla, CA), AB(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 267, April 15, 1983, p. 691-697. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Binary Stars, Galactic Radiation, Milky Way Galaxy, Stellar Luminosity, Variable Stars, X Ray Sources, B Stars, Heao 1, Heao 2, M Stars, Neutron Stars, Stellar Radiation, Stellar Spectra, X Ray Spectra
Bibliographic Code:


The number density of serendipitous sources in galactic plane Einstein Observatory IPC fields are compared with predictions based on the intensity of the HEAO 1 A-2 unresolved hard X-ray galactic ridge emission. It is concluded that it is unlikely that X-ray sources with 2-10 keV luminosities from about 8 x 10 to the 32nd to about 3 x 10 to the 34th ergs/s are dominant contributors to the hard X-ray galactic ridge. Their surfacea density is less than about 8 x 10 to the -4th/L(32)/sq pc. In particular, Be/neutron star systems such as X Per are not expected to be dominant contributors, both because the 2-10 keV luminosity is roughly 10 to the 33rd ergs/s and their scale height is too small. Lower luminosity stellar systems are likely to be major contributors to the ridge. RS CVn and CV systems with 2-10 keV luminosities between 2 x 10 to the 30th and 4 x 10 to the 32nd ergs/s contribute about 43 + or 18 percent.

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