Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234l...9t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 234, Nov. 15, 1979, p. L9-L13. Research supported by the Science Res
Astronomy and Astrophysics
Astronomy
329
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
Scientific paper
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.
Avni Yoav
Branduardi G.
Elvis Martin
Fabbiano Giuseppina
Feigelson Eric
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