ray spectroscopy of bright Seyfert 2s: e importance of the 10-100 keV spectru Guido Risaliti INAF - Arcetri Observatory, Italy & Harvard-Smithsonian Center for Astrophysics - One Case study: XMM observations of NGC 1365 - Time-resolved N H variability: current limits - The impact of Simbol-X Outline
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X-ray spectroscopy of bright Seyfert 2s: The importance of the 10-100 keV spectrum
Outline. One Case study: XMM observations of NGC 1365 Time-resolved N H variability: current limits - The impact of Simbol-X. X-ray spectroscopy of bright Seyfert 2s: The importance of the 10-100 keV spectrum. Guido Risaliti. INAF - Arcetri Observatory, Italy & - PowerPoint PPT Presentation
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X-ray spectroscopy of bright Seyfert 2s: The importance of the 10-100 keV spectrum
Guido RisalitiINAF - Arcetri Observatory, Italy
&Harvard-Smithsonian Center for Astrophysics
- One Case study: XMM observations of NGC 1365- Time-resolved NH variability: current limits- The impact of Simbol-X
Outline
NGC 1365: The best laboratory to investigate the absorber in obscured AGN
Spectral analysis of XMM long observations2. Relativistic Iron Line
One of the best cases, only (?) strong case in high NH sources
Disappearing in obscured spectrum --> within 1014 from the center
Intra-day NH variations XMM 4: 60 ks
New analysis: -10 time intervals, 6 ks each-Constant continuum + (a) free NH for each spectrum (b) two NH (the same for all spectra) and free covering factor of NH2
Short-time column density variability
T = 25 ksD ~ 3x1013 cm
NH1=1.1x1023 cm-2
NH2=3.0x1023 cm-2
Only) other know case: NGC 4151 observation with BeppoSAX
Puccetti et al. 2007
Simbol-X simulations:
T = 6 ksec
NH=2x1023 cm-2
E(NH) ~ 20%
E(NH) ~ 6%
XMM (var. cont.):
E(NH) ~ 6%XMM (const cont.):
Conclusions
- Short timescale (~5-10 ksec) column denisty variability may be common in Seyfert Galaxies
-Resolving the NH variability is crucial to understand the structure of the circumnuclear absorber AND to obtain a correct fit of the other spectral components
-High quality 10-50 keV spectra needed to unambigously detect NH variability: Simbol-X capable to completely remove degeneracy between spectral parameters in bright Seyfert Galaxies