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 nH < 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)

• nH = 1012 cm-3, CD = 1025 cm-2, es = 4), F = cte (0.1 eV - 100 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

• nH = 107 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 2004Godet et al., A&A 2004

=5

=10 =30

=100 =300

=1000

=100

• 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 • 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 nH < 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)

• nH = 1012 cm-3, CD = 1024 cm-2, es = 0.8).

Dumont et al., A&A 2003