Abstract

view Abstract Citations (494) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-ray studies of quasars with the Einstein Observatory. Tananbaum, H. ; Avni, Y. ; Branduardi, G. ; Elvis, M. ; Fabbiano, G. ; Feigelson, E. ; Giacconi, R. ; Henry, J. P. ; Pye, J. P. ; Soltan, A. ; Zamorani, G. 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. Publication: The Astrophysical Journal Pub Date: November 1979 DOI: 10.1086/183100 Bibcode: 1979ApJ...234L...9T 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; Astrophysics; Quasars:X-Ray Sources full text sources ADS | data products NED (40) SIMBAD (5) Related Materials (3) Part 2: 1981ApJ...245..357Z Part 3: 1983ApJ...268...60T Part 4: 1987ApJ...313..596W