Photoionized plasma analysis. Jelle Kaastra. Introduction. What is a photoionised plasma?. Plasma where apart from interaction with particles also interaction with photons occurs Photon spectrum needs to affect the particles (e.g. heating)
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Photoionized plasma analysis
Radiative recombination (electron capture)
Cooling by collisional excitation (followed by line radiation)
Ξ = Fion/nkTc= ξ/4πckT
Stable equilibrium fordT/d Ξ> 0
Emission measure Column density
Ionisation parameter ξ
Discrete components in pressure equilibrium?
Continuous NH(ξ) distribution?
Krongold et al. 2003
Steenbrugge et al. 2005
0 = dni/dt = niRi-1 + ni+1Ri
trec = 1 / [ne (ni+1/ni – αi-1/αi)]
Simplified case: predicted change transmission forinstantaneous 0.1 dexincrease L, at spectralresolution EPIC/pn
Signal is weak (1% level) but detectable
Time evolution ion concentrations ni:
dni/dt = Aij(t) nj
Aij(t) contains t-dependentionisation & recombinationrates