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27 April 2024 |
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Observation of Cen A by the Rossi X-ray Timing Explorer | | R.E. Rothschild
; D.L. Band
; P.R. Blanco
; D.E. Gruber
; W.A. Heindl
; D.R. MacDonald
; D.C. Marsden
; K. Jahoda
; D. Pierce
; G. Madejski
; M. Elvis
; D.A. Schwartz
; R. Remillard
; A.A. Zdziarski
; C. Done
; R. Svensson
; | | Date: |
5 Aug 1998 | | Subject: | astro-ph | | Affiliation: | CASS/UCSD, GSFC, CfA, MIT, NCAC Poland, Univ. of Durham England, Stockholm Observatory Sweden | | Abstract: | The Rossi X-ray Timing Explorer made a short (10 ks) observation of the radio galaxy Centaurus A on 14 August 1996. Analysis of the combined 2.5-240 keV spectrum has revealed a heavily absorbed(NH=9.42+/-0.24 e22 cm-2) primary power law (index=1.86+/-0.015) and an iron line due to fluorescence of cold matter (EW=162+/-25 eV). Flux from either a jet, primary flux scattered into the line of sight, or primary flux seen through a partial absorber was not required. The iron line width is unresolved at the 95% confidence level (sigma < 0.54 keV). No significant variability in the iron line flux is seen from measurements over the last two decades, while the overall continuum flux varied by more than a factor of four, which implies that the line emission region is distant from that of the primary emission. While radio-quiet Seyfert galaxies exhibit spectral components attributable to Compton reflection from cold matter, Cen A reveals no such component (exposed solid angle ratio < 0.09). This supports unified models of active galaxies that have little difference between Seyfert 2 and low luminosity radio galaxies | | Source: | arXiv, astro-ph/9808042 | | Services: | Forum | Review | PDF | Favorites | |
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