Volume 543, July 2012
|Number of page(s)||5|
|Published online||19 June 2012|
IGR J12319–0749: evidence for another extreme blazar found with INTEGRAL
1 INAF/IASF Bologna, via Piero Gobetti 101, 40129 Bologna, Italy
2 Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
3 INAF/IAPS Rome, via Fosso del Cavaliere 100, 00133 Rome, Italy
4 School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK
Received: 19 March 2012
Accepted: 11 May 2012
We report on the identification of a new soft gamma-ray source, IGR J12319–0749, detected with the IBIS imager on board the INTEGRAL satellite. The source, which has an observed 20−100 keV flux of ~8.3 × 10-12 erg cm-2 s-1, is spatially coincident with an active galactic nucleus (AGN) at redshift z = 3.12. The broad-band continuum, obtained by combining XRT and IBIS data, is flat (Γ = 1.3) with evidence for a spectral break around 25 keV (100 keV in the source restframe). X-ray observations indicate flux variability, which is also supported by a comparison with a previous ROSAT measurement. IGR J12319–0749 is also a radio-emitting object likely characterised by a flat spectrum and high radio loudness; optically it is a broad-line emitting object with a massive black hole (2.8 × 109 solar masses) at its centre. The source spectral energy distribution is similar to another high-redshift blazar, 225155+2217 at z = 3.668: both objects are bright, with a high accretion disk luminosity and a Compton peak located in the hard X-ray/soft gamma-ray band. IGR J12319–0749 is likely the second-most distant blazar detected so far by INTEGRAL.
Key words: gamma rays: general / X-rays: galaxies / galaxies: active / X-rays: individuals: IGR J12319 / 0749
© ESO, 2012
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