The X-ray spectrum of the highly polarized quasar PKS 1502+106

Details The X-ray spectrum of the highly polarized quasar PKS 1502+106 The X-ray spectrum of the highly polarized quasar PKS 1502+106

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l..59g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 1, p. L59-L62

Astronomy and Astrophysics

Astronomy

10

Active Galactic Nuclei, Active Galaxies, Gamma Rays, Quasars, Stellar Luminosity, X Ray Spectra, Imaging Spectrometers, Light Curve, Synchrotrons, X Ray Astronomy

Scientific paper

We report the detection and spectrum of the distant (z = 1.839), highly polarized quasar PKS 1502+106 in the X-ray band based on data collected over the period 1990-1994 using ROSAT and ASCA. We find the source to exhibit intensity variations of a factor approximately greater than 2 at 1 keV on timescales of years, small compared to the variability observed historically in the radio, millimeter, and optical bands. The (energy) spectral index is found in the range 0.4 approximately less than alphax approximately less than 0.8 (at 90% confidence). Its multiwaveband spectral index is broadly consistent with other highly polarized quasars (HPQs). From the application of an inhomogeneous synchrotron self-Compton (SSC) jet we find that a model similar to that proposed for 3C 279 is consistent with the multiwaveband spectrum. We suggest that a change in the energy injection and/or transport mechanisms within such a jet could easily result in PKS 1502+106 being detectable at gamma-ray energies.

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