Accurate Atomic Rates for Black Hole Accretion Disks John Raymond Disk winds have been know in AGN...
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Transcript of Accurate Atomic Rates for Black Hole Accretion Disks John Raymond Disk winds have been know in AGN...
Accurate Atomic Rates for Black Hole Accretion Disks
John Raymond
Disk winds have been know in AGN for years andsuspected in Galactic Black Hole Binaries
Miller et al. 2006 Chandra HETG GRO1655-40
Chance for a Serious Model
90 Absorption lines, blueshift ~ 500 – 1000 km/s
Usual elements + P, Cl, K, Ti, Cr, Mn, Co
Fe XXIV lines up to 2s – 10p or more
Limits on emission lines (4p-3s) imply small covering fraction
Photoionization model using measured X-ray continuum
Density, r and Abundances are the unknowns
Density Measurement
Ratio of Fe XXII lines at11.92 and 11.77 gives n2/n1
Mauche et al. emission lines
Depends on A value qelectron
qproton
cascades
13.6 < Log ne < 14.1
Ionization Parameter
(O-Ne and Ca-Fe Abundances x 2)
Differs from optical
Voigt profileUnresolved doubletsInner shell Fe K
ξ ~ 104 (soft spectrum)
Limits on rColumn Density N ~ nr
Ionization parameter ξ from highest and lowest ionizationstages: Fe XXVI vs Fe XXII and Model
ξ = L/4πnr2
For known L and ξ, N drops off with r, giving upper limit,
For known L, ξ and n, r is known
Physics of WindNot Radiation-Pressure driven; measure lines and no UV
Miller et al. find r < 10 9.5 < 0.1 RIC = 10 10.7
Implies not thermally driven (Begelman, McKee, Shields), leaving magnetically driven wind
Importance of Atomic RatesHagai Netzer says r=10 10.7 = 0.1 RIC works, so thermallydriven wind is OK, but with ne only 10 13. Higher ne
requires r < 10 10.4 even for his ionization parameter.
XSTAR, CLOUDY seem to fall in between
Woods et al require 0.2 RIC and density is < 10 12
σphot(E)
f values αrec (DR rates for high ions, low T) Δn=0 cooling transitions Fe XXII fine structure transition