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X-ray diagnostics with full radiative transfer (ALI method)

X-ray diagnostics with full radiative transfer (ALI method). Loic Chevallier , Anne-Marie Dumont, Olivier Godet, Suzy Collin, Anabela C. Goncalves. ALI method. Gives I(z, m , n ) : 1% Fast iterative method, Max. accuracy : z, m -grid. PRD, polarization, multi-D, etc.

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X-ray diagnostics with full radiative transfer (ALI method)

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  1. X-ray diagnostics with full radiative transfer (ALI method) Loic Chevallier, Anne-Marie Dumont, Olivier Godet, Suzy Collin, Anabela C. Goncalves

  2. ALI method • Gives I(z,m,n) : 1% • Fast iterative method, • Max. accuracy : z,m-grid. • PRD, polarization, multi-D, etc. • Escape probability : requires homogeneous medium optically thin at the line frequencies, no energy balance. • 2-stream : 1 angle • GS/SOR > x10 faster Quang, Paletou, Chevallier, 2004

  3. TITAN code • 102 ions, microturbulence • Compton heating (NOAR) • He-like : 15 levels + continuum • (Godet et al., A&A 2004) • Accuracy order 10 % for the triplet • Previous 11 levels model : • 50 % accuracy (Coupé et al., A&A 2004) • log CD < 26 • 5 < log nH < 14 • 1 < log x < 4 • 4 < log T < 8 • Photoionized non-LTE medium • Plane-parallel geometry • Gives consistent T, pops., flux (outward, reflected) in all directions • Local and global radiative equilibrium • Modes : constant density, gaseous pressure, total pressure

  4. Influence on line fluxes • typical model for the region emitting the UV-X “continuum” of AGN • Reflected continuum R=30 (Doppler width R=3-10) • nH = 1012 cm-3, CD = 1025 cm-2, x = 103(tes = 4), nFn = cte (0.1 eV - 100 keV) • (x10) on resonance lines, because line photons are reabsorbed. Dumont et al., A&A 2003

  5. Influence on line ratios • Typical model for the emission region of Seyfert 2 • nH = 107 cm-3 (cte), x = 10 • no microturbulence : 30% at log(CD)=20 to (x5) at log(CD)=23. • Turbulence (300 km/s) : < 50% (weaker optical thickness at line frequencies). Collin et al., A&A 2004

  6. Ionic abundance and temperature vs. CD Temperature, OVII fractional abundance Coupé et al., A&A 2004

  7. G (O VII) ratio vs. CD • Grid of models (7<log nH<12, 18<log CD<23) • G independant on nH • R depends on log nH > 10 • Influence of CD and x • Same G for several (x,CD) values x=10 x=30 x=5 x=300 x=100 x=1000 x=100 Coupé et al., A&A 2004 Godet et al., A&A 2004

  8. New Diagnostic OVII Godet et al., A&A 2004

  9. Angular distribution - global

  10. Angular distribution - O VII G = (z + x) / w, R = z / x, G or R change with inclination

  11. Future work • Multi-angle applications (aperture constraint) • PRD (this year) • Atomic data • Acceleration (SOR, parallel) • Grids of models (VO) • Public release (VO)

  12. APPENDICES

  13. He-like ion model (15 levels)

  14. EW (sum ofO VII triplet) vs. CD • One curve per x value • 7 < log nH < 12 • Saturation 25 eV • Same EW for several • (x,CD) values Coupé et al., A&A 2004

  15. Influence on line fluxes (thin) • typical model for the region emitting the UV-X “continuum” of AGN • Reflected continuum R=30 (Doppler width equivalent R=3-10) • nH = 1012 cm-3, CD = 1024 cm-2, x = 103 (tes = 0.8). Dumont et al., A&A 2003

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