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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 &

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X-ray spectroscopy of bright Seyfert 2s: The importance of the 10-100 keV spectrum

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  1. Outline • One Case study: XMM observations of NGC 1365 • Time-resolved NH 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 & Harvard-Smithsonian Center for Astrophysics

  2. NGC 1365: The best laboratory to investigate the absorber in obscured AGN Hard X-ray observations: ASCA (1995) 40 ks BeppoSAX (1997) 30 ks Chandra (Dec 2002) 15 ks XMM 1 (Jan 2003) 17 ks XMM 2 (Jan 2003) 10 ks XMM 3 (Aug 2003) 15 ks XMM 4 (Jan 2004) 60 ks XMM 5 (Aug 2004) 60 ks Chandra (Apr 2006): 6 x 15 ks (Risaliti et al. 2007, ApJ 659, L11)

  3. NGC 1365: Two XMM long observations

  4. Spectral analysis of XMM long observations 2. Relativistic Iron Line • One of the best cases, only (?) strong case in high NH sources • Disappearing in obscured spectrum --> within 1014 from the center

  5. Intra-day NH variations XMM 4: 60 ks

  6. Short-time column density variability NH1=1.1x1023 cm-2 NH2=3.0x1023 cm-2 T = 25 ks D ~ 3x1013 cm • 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

  7. Only) other know case: NGC 4151 observation with BeppoSAX Puccetti et al. 2007

  8. Simbol-X simulations: T = 6 ksec NH=2x1023 cm-2 E(NH) ~ 6% XMM (var. cont.): E(NH) ~ 20% XMM (const cont.): E(NH) ~ 6%

  9. 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

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