The Extreme SED of the Quasar [HB89] 0102-272

Details The Extreme SED of the Quasar [HB89] 0102-272 The Extreme SED of the Quasar [HB89] 0102-272

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1126..235b&link_type=abstract

SIMBOL-X: FOCUSING ON THE HARD X-RAY UNIVERSE: Proceedings of the 2nd International Simbol-X Symposium. AIP Conference Proceedi

Computer Science

Spectroscopy And Spectrophotometry, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray, Infall, Accretion, And Accretion Disks

Scientific paper

We have studied the spectral energy distribution of the quasar [HB89] 0102-272. The available multiwavelength data in the observers frame are one optical spectrum between 3000 and 8000 Å, 7 HST FOS spectra between 1600 and 2300 Å, and 3 ROSAT PSPC pointed observations in the 0.1-2.4 keV energy band. The αox value obtained from the HST FOS spectra and the optical spectrum is extreme with -2.2 and -2.1, respectively and is one of the steepest values reported so far. The 2500 Å luminosity density is about 5 orders of magnitude larger than the 2 keV flux density. The object is as bright as the brightest SDSS quasars but X-ray weak at 2 keV. We compare our αox findings with the mean quasar SED from [14] and conclude that [HB89] 0102-292 is unusual for any type of quasar SED's. In addition an extreme steep soft X-ray photon index of Γ = (6.0+/-1.3) has been detected, the steepest value reported so far. When fitting the X-ray and optical and HST UV data simultaneously with a simple black body model an extreme discrepancy becomes apparent. While the rest frame UV photons appear to be emitted from an accretion disc, the X-ray's must arise from something else and are not related to the UV photons.

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