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Title:
X-ray studies of quasars with the Einstein Observatory
Authors:
Tananbaum, H.; Avni, Y.; Branduardi, G.; Elvis, M.; Fabbiano, G.; Feigelson, E.; Giacconi, R.; Henry, J. P.; Pye, J. P.; Soltan, A.; Zamorani, G.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.), AG(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Weizmann Institute of Science, Rehovot, Israel), AH(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Leicester, University, Leicester, England), AI(Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass; Leicester, University, Leicester, England), AJ(HarvardSmithsonian Center for Astrophysics, Cambridge, Mass; Polska Akademia Nauk, Centrum Astronomiczne, Warsaw, Poland)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L9-L13. Research supported by the Science Research Council and U.S.-Israel Binational Science Foundation. (ApJL Homepage)
Publication Date:
11/1979
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Heao 2, Quasars, Stellar Mass Accretion, Stellar Spectra, X Ray Sources, Black Holes (Astronomy), Emission Spectra, Red Shift, Stellar Luminosity, X Ray Spectra, X Ray Telescopes
DOI:
10.1086/183100
Bibliographic Code:
1979ApJ...234L...9T

Abstract

Results of an investigation of the X-ray properties of quasars conducted using the Einstein Observatory (HEAO 2) are reported. The positions, fluxes and luminosities of 35 known quasars were observed by the Einstein high-resolution imaging detector and the imaging proportional counter. Assuming optical redshifts as valid distance indicators, 0.5-4.5 keV X-ray luminosities ranging from 10 to the 43rd to 10 to the 47 ergs/sec are obtained, with evidence of very little cold gas absorption. Flux variability on a time scale of less than 10,000 sec is observed for the quasar OX 169, which implies a mass between 8 x 10 to the 5th and 2 x 10 to the 8th solar masses for the black hole assumed to be responsible for the emission. Preliminary results of the quasar survey also indicate that quasars contribute significantly to the diffuse X-ray background.

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