Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-16
Astrophys.J.641:801-821,2006
Astronomy and Astrophysics
Astrophysics
48 pages, 14 figures, 10 tables, accepted for publication by The Astrophysical Journal
Scientific paper
10.1086/500534
INTEGRAL and RXTE performed three simultaneous observations of the nearby radio galaxy Cen A in 2003 March, 2004 January, and 2004 February with the goals of investigating the geometry and emission processes via the spectral/temporal variability of the X-ray/low energy gamma ray flux, and intercalibration of the INTEGRAL instruments with respect to those on RXTE. When combined with earlier archival RXTE results, we find the power law continuum flux and the line-of-sight column depth varied independently, and the iron line flux was essentially unchanging. Taking X-ray spectral measurements from satellite missions since 1970 into account, we discover a variability in the column depth between 1.0x10^23 cm^-2 and 1.5x10^23 cm^-2, and suggest that variations in the edge of a warped accretion disk viewed nearly edge-on might be the cause.
Benlloch Sara
Collmar Werner
Deluit Sandrine
Khandrika Harish
Madejski Grzegorz
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