X-ray spectra of compact extragalactic radio sources

Details X-ray spectra of compact extragalactic radio sources X-ray spectra of compact extragalactic radio sources

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..396w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 396-407.

Statistics

Computation

154

Extragalactic Radio Sources, Quasars, X Ray Spectra, Bl Lacertae Objects, Computational Astrophysics, Maximum Likelihood Estimates, Power Spectra, Synchrotron Radiation, X Ray Sources

Scientific paper

A comparison is conducted of the 0.1-3.5 keV mean power law energy spectral indices (alpha) measured by the Einstein Observatory IPC for (1) 19 low polarization, flat radio spectrum (FRS) core-dominant QSOs; (2) 12 highly polarized QSOs (HPQs); and (3) 24 radio-selected BL Lac objects. Individual spectral fits are presented for several sources for which results are unavailable elsewhere. A maximum-likelihood analysis was used to ascertain the mean power-law index and the standard deviation for each class, under the assumption of a Gaussian intrinsic distribution. The distributions for HPQ and FRS QSOs are similar, in contrast with a small sample of the X-ray-selected BL Lac objects. Implications of these findings for synchrotron self-Compton models are considered.

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