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

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

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398...87o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 1, p. 87-93.

Astronomy and Astrophysics

Astronomy

13

Quasars, X Ray Spectra, Absorption Spectra, Energy Spectra, Ginga Satellite, Light Curve, Spaceborne Astronomy, Synchrotron Radiation

Scientific paper

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 exp 46 ergs/s and alpha = 0.72 +/- 0.11 for NRAO 140, and L(x) = 5.3 x 10 exp 44 ergs/s and alpha = 0.64 super +0.17-0.14 for 4C 34.47 (H0 = 100 km/s per Mpc; q0 = 0.5); the intensity variation was less than about 10 percent during the one day observation for each source. Upper limits, in the source rest frame, for iron line emission are EW less than 200 and EW less than 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.

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