X-ray spectra of bright core-dominant quasars - NRAO 140 and 4C 34.47

Abstract

view Abstract Citations (13) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Spectra of Bright Core-dominant Quasars: NRAO 140 and 4C 34.47 Ohashi, T. ; Tashiro, M. ; Makishima, K. ; Kii, T. ; Makino, F. ; Turner, M. J. L. ; Williams, O. R. Abstract Two bright quasars NRAO 140 (z = 1.258) and 4C 34.47 (z = 0.206) have been studied with Ginga. The observed spectra in the energy range 2-20 keV, in the observer rest frame, are well described by power-law models. The measured 2-10 keV luminosities and energy indices are L_X_ = 3.8 x 10^46^ ergs s^-1^ and α = 0.72+/-0.11 for NRAO 140, and L_X_= 5.3 X 10^44^ ergs s^-1^ and α = 0.64^+0.17^_-0.14_ for 4C 34.47(H_0_= 100 km s^-1^ Mpc^-1^; q_0_ = 0.5); the intensity variation was less than about 10% during the ~1 day observation for each source. Upper limits, in the source rest frame, for iron line emission are EW < 200 and EW < 120 eV for NRAO 140 and 4C 34.47, respectively. The featureless X-ray spectra, whose slopes are flatter than those of BL Lac objects, and the high X-ray luminosities in excess of the extension of the IR-optical continuum are consistent with the synchrotron self-Compton emission accompanied by a moderate beaming toward us. Publication: The Astrophysical Journal Pub Date: October 1992 DOI: 10.1086/171838 Bibcode: 1992ApJ...398...87O Keywords: Quasars; X Ray Spectra; Absorption Spectra; Energy Spectra; Ginga Satellite; Light Curve; Spaceborne Astronomy; Synchrotron Radiation; Astrophysics; RADIATION MECHANISMS: CYCLOTRON AND SYNCHROTRON; GALAXIES: QUASARS: INDIVIDUAL ALPHANUMERIC: NRAO 140; GALAXIES: QUASARS: INDIVIDUAL ALPHANUMERIC: 4C 34.47; X-RAYS: GALAXIES full text sources ADS | data products SIMBAD (4) NED (2)