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• W2106567348 abstract "We present an XMM-Newton observation of the radio-quiet quasar Q0056-363 (). This is the first time that this quasar is observed in the hard X-ray range (above 2 keV). We find that Q0056-363 is a powerful X-ray quasar, with a 0.3–12 keV unabsorbed luminosity of about erg s-1 with the largest part (~67%) emitted below 2 keV. The spectrum reveals a large featureless soft X-ray excess below 2 keV and a strong broad Fe Kα line at 6.4 keV (in the quasar frame). The Fe Kα line is due to low to moderate ionization states of iron (i.e., <), with an equivalent width of about 250 eV and a velocity width of about 25 000 km s-1. Q0056-363 is presently the most luminous AGN known to exhibit such a broad and intense Fe Kα line profile from near neutral iron. The line can be fitted with a relativistic profile from an accretion disc around either a Schwarzschild (non-rotating) or a Kerr (rotating) black hole. A combination of two thermal Comptonization components and a disc reflection model is favored to explain both the continuum over the energy range 0.3–12 keV and the Fe Kα line. A patchy corona covering a large part of the inner disc surface is needed in order to be compatible with the accretion rate inferred from the spectral energy distribution of Q0056-363, unless the mass of the black hole is much higher than about ." @default.
• W2106567348 created "2016-06-24" @default.
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• W2106567348 date "2003-09-01" @default.
• W2106567348 modified "2023-09-26" @default.
• W2106567348 title "An intense and broad Fe Kα line observed in the X-ray luminous quasar Q 0056-363 with XMM-Newton" @default.
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• W2106567348 doi "https://doi.org/10.1051/0004-6361:20030950" @default.
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