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, , ) : 1% Fast iterative method, Max. accuracy : z,  -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

TITAN code 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 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 n H < 14 1 < log  < 4 4 < log T < 8

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) n H = cm -3, CD = cm -2,     es = 4), F = cte (0.1 eV keV) (x10) on resonance lines, because line photons are reabsorbed. Dumont et al., A&A 2003

Influence on line ratios Collin et al., A&A 2004 Typical model for the emission region of Seyfert 2 n H = 10 7 cm -3 (cte),  no microturbulence : 30% at log(CD)=20 to (x5) at log(CD)=23. Turbulence (300 km/s) : < 50% (weaker optical thickness at line frequencies).

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

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

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

Angular distribution - global

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

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

APPENDICES

He-like ion model (15 levels)

EW (sum of O VII triplet) vs. CD One curve per  value 7 < log n H < 12 Saturation 25 eV Same EW for several ( ,CD) values Coupé et al., A&A 2004

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) n H = cm -3, CD = cm -2,     es = 0.8). Dumont et al., A&A 2003