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• W3106516241 abstract "X-ray observations of unabsorbed active galactic nuclei provide an opportunity to explore the innermost regions of supermassive black hole accretion discs. Our goal in this paper is to investigate the central environment of a Seyfert 1.5 galaxy IRAS 05078+1626. We studied the time-averaged spectrum obtained with the EPIC and RGS instruments. A power-law continuum (photon index ~ 1.75) dominates the 2-10 keV energy range. A narrow iron K alpha spectral line is clearly seen, presumably originating in a distant torus, but no broad relativistic component was detected. However, the power law and the iron K alpha line alone do not provide a satisfactory fit in the soft X-ray band whose spectrum can be explained by the combination of three components: a) a cold photoelectric absorber with column density ~ 10^(21) cm^(-2). This gas could be located either in outer parts of the accretion disc, at the rim of the torus or farther out in the host galaxy; b) a warm absorber with high ionization parameter (log(xi) ~ 2.2) and column density ~ 10^(24) cm^(-2); c) an ionized reflection where the reflecting gas could be either in the inner wall of a warm absorber cone or in an ionized accretion disc. The first X-ray spectroscopic measurement of IRAS05078+1626 unveils some of the standard ingredients in Seyfert galaxies, such as a power-law primary continuum, modified by reflection from the accretion disc and by the effect of complex, multi-phase obscuration. However, data constrains the accretion disc, if present, not to extend closer than to 60 gravitational radii from the black hole." @default.
• W3106516241 created "2020-11-23" @default.
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• W3106516241 date "2010-03-01" @default.
• W3106516241 modified "2023-10-14" @default.
• W3106516241 title "Warm absorber and truncated accretion disc in IRAS 05078+1626" @default.
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• W3106516241 doi "https://doi.org/10.1051/0004-6361/200913659" @default.
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