Publication: X-ray spectra of compact extragalactic radio sources
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Date
1990
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IOP Publishing
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Citation
Worrall, D. M., and B. J. Wilkes. 1990. “X-Ray Spectra of Compact Extragalactic Radio Sources.” The Astrophysical Journal 360 (September): 396. doi:10.1086/169130.
Research Data
Abstract
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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Keywords
BL Lacertae objects, radiation mechanisms, quasars, X-rays: sources, X-rays: spectra
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