INTEGRAL and RXTE Observations of Centaurus A

Abstract

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.

48 pages, 14 figures, 10 tables, accepted for publication by The Astrophysical Journal

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• Pulse phase resolved analysis of the HMXB Cen X-3 over two binary orbits
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• A lepto-hadronic model for high-energy emission from FR I radiogalaxies
• The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Material
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• Twelve and a Half Years of Observations of Centaurus A with RXTE
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• Suzaku view of X-ray Spectral Variability of the Radio Galaxy Centaurus A : Partial Covering Absorber, Reflector, and Possible Jet Component
• RXTE observations of the 1A 1118-61 in an outburst, and the discovery of a cyclotron line
• The Difference in Narrow Fe KαLine Emission Between Seyfert 1 and Seyfert 2 Galaxies
• Galaxies Correlating with Ultra-high Energy Cosmic Rays
• Monitoring the Violent Activity from the Inner Accretion Disk of the Seyfert 1.9 Galaxy NGC 2992 with RXTE
• A0535+26 in the April 2010 outburst: probing the accretion regime at work
• First Results from Fermi GBM Earth Occultation Monitoring: Observations of Soft Gamma-Ray Sources Above 100 keV
• Soft gamma-ray sources detected by INTEGRAL
• Centaurus A at Hard X-rays and Soft Gamma-rays
• Hard X-ray emission in Centaurus A
• Multi-epoch X-ray spectral analysis of Centaurus A: revealing new constraints on iron emission line origins
• Imaging and Spectral Fitting of Bright Gamma-ray Sources with the COSI Balloon Payload