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Structure of the Circumnuclear Region of Seyfert 2 Galaxies Revealed by RXTE Hard X-ray Observations of NGC 4945 | | G.M. Madejski
; P.T. Zycki
; C. Done
; A. Valinia
; P. Blanco
; R. Rothschild
; B. Turek
; | | Date: |
3 Feb 2000 | | Subject: | astro-ph | | Affiliation: | NASA/GSFC), P.T. Zycki (Copernicus Ctr.), C. Done (Durham Univ.), A. Valinia (NASA/GSFC), P. Blanco (UCSD), R. Rothschild (UCSD), B. Turek (Stanford Univ. | | Abstract: | We report the Rossi X-ray Timing Explorer observations of the heavily absorbed Seyfert 2 galaxy NGC 4945, which confirm the large column density of the absorber, corresponding to the optical depth to Thomson scattering of about 2.4. The hard X-ray flux (8-30 keV) measured by us is rapidly variable with a large amplitude, on time scales of a day or less. This implies that the bulk of the extreme absorption does not originate in a parsec-size, geometrically thick molecular torus: limits on the amount of scattered flux require that the optically thick material on parsec scales must be rather geometrically thin, subtending a half-angle of less than 10 degrees as seen from the nucleus. This presents a problem in accounting for the Cosmic X-ray Background primarily with AGN possessing such geometry. | | Source: | arXiv, astro-ph/0002063 | | Services: | Forum | Review | PDF | Favorites | |
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