150 keV Emission from PKS2149-306 with BeppoSAX: A Compton Suppressed Jet and the Origin of Radio-quiet Quasars

Astronomy and Astrophysics – Astronomy

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A BeppoSAX observation of the z=2.34 quasar PKS2149-306 produced a strong signal in the high energy PDS instrument up to a maximum observed energy of nearly 50 keV, 150 keV in the quasar frame. The Beppo-SAX spectrum spans almost 3 decades (0.3-150 keV, quasar frame) and shows a hard (alpha =0.4+/-0.05) X-ray spectrum above 3 keV, and either a softer (alpha =1.0(+0.6}_{-0.3) ) low energy component, or an ionized absorber at zero redshift. An ionized absorber may be blueshifted from the quasar frame with v=0.6c. No evidence is seen of an Fe-K emission line (EW<50 eV at 6.5 keV rest) or a Compton hump (R<0.3). A bremsstrahlung fit gives kT(rest)=46(+32}_{-16) keV, similar to the X-ray background value. The SED of PKS 2149-306 shows two peaks at ~ 10({12+/-) 0.5}Hz and ~ 10({21+/-) 1.0}Hz ( ~ 0.3 mm and ~ 4 MeV), strongly resembling a low energy cutoff BL Lac object (LBL). The ratio of the two peaks shows an extreme Compton dominance (C_D=1.4+/- 0.4), as in flat spectrum radio quasars (FSRQs). The presence of an additional `optical/UV big bump' component may provide photons that cool the jet, suppressing the radio emission. Compton suppression amplifies changes in intrinsic jet power into a greater change in radio loudness. Hence a modest extension from conditions in PKS2149--306 may completely quench a radio jet. The result would be a radio-quiet quasar. Several predictions of the radio and X-ray properties of radio-quiet AGN follow from this picture.

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