The X-ray reflector in NGC 4945: a time- and space-resolved portrait
作者： A. Marinucci , G. Risaliti , Junfeng Wang , E. Nardini , M. Elvis
DOI: 10.1111/J.1745-3933.2012.01232.X
关键词: Reflector (antenna) 、 Primary (astronomy) 、 Astrophysics 、 Reflection (physics) 、 Plane (geometry) 、 Physics 、 X-ray 、 Sky 、 Accretion (meteorology) 、 Absorption (electromagnetic radiation) 、 Astronomy
摘要: We present a time, spectral and imaging analysis of the X-ray reflector in NGC 4945, which reveals its geometrical physical structure with unprecedented detail. 4945 hosts one brightest AGN sky above 10 keV, but it is only visible through reflected/scattered emission below due to absorption by column density ∼4 × 24 cm −2 .An ew Suzaku campaign five observations spanning ∼6 months, together past XMM–Newton Chandra observations, shows remarkable constancy (within <10 per cent) reflected component. Instead, Swift-BAT strong intrinsic variability on time-scales longer than 1 yr. Modelling circumnuclear gas as thin cylinder axis plane sky, we show that at distance ≥30–50 pc, well within capabilities (1 arcsec ∼18 pc). Accordingly, resolved, flattened, ∼150 pc long clumpy structure, whose spectrum fully cold reflection primary emission. The clumpiness may explain small covering factor derived from properties.
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