Synchrotron X-ray Emission from Flat-spectrum Radio Quasars

Details Synchrotron X-ray Emission from Flat-spectrum Radio Quasars Synchrotron X-ray Emission from Flat-spectrum Radio Quasars

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aspc..299...63p&link_type=abstract

High Energy Blazar Astronomy, ASP Conference Proceedings, Vol. 299, held 17-21 June 2002 at Tuorla Observatory, Piikkio, Finland

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present new BeppoSAX observations of four flat-spectrum radio quasars (FSRQ) with spectral energy distributions similar to those of high-energy peaked BL Lacs. In one of our sources the BeppoSAX band is dominated by synchrotron emission peaking at ˜ 2 × 1016 Hz, as also shown by its steep (energy index αx ˜ 1.5) spectrum. This makes this object the first known FSRQ whose X-ray emission is not due to inverse Compton radiation. Two other sources display a flat X-ray spectrum (αx ˜ 0.7) but with indications of steepening at low energies. In these objects, the combination of BeppoSAX and ROSAT observations, (non-simultaneous) multifrequency data, and a synchrotron inverse Compton model suggest synchrotron peak frequencies ≈ 1015 Hz, although a better coverage of the spectral energy distributions is needed to provide firmer values. Our sources, although firmly in the radio--loud regime, have powers more typical of high--energy peaked BL Lacs than of FSRQ, and indeed their radio powers put them near the low--luminosity end of the FSRQ luminosity function. We discuss this in terms of an anti-correlation between synchrotron peak frequency and total power, based on physical arguments, and also as possibly due to a selection effect.

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