X-ray spectroscopy (PDF) - SRON
X-ray spectroscopy (PDF) - SRON
X-ray spectroscopy (PDF) - SRON
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• UTA = Unresolved<br />
Transition Ar<strong>ray</strong>, blend<br />
of narrow features<br />
• Due to inner-shell<br />
transitions<br />
• Almost no accurate<br />
atomic data available<br />
before Sako et al.<br />
(2001)<br />
The Fe UTA<br />
97<br />
Calculations & Lab measurements<br />
of inner-shell transitions<br />
• Example: oxygen<br />
K-shell transitions (Gu<br />
et al. 2005)<br />
• Lab measurements:<br />
EBIT<br />
• Calculations: FAC<br />
• accurate λ for<br />
O V 1s-2p main line:<br />
uncertainty only 3 mÅ<br />
(50 km/s)<br />
98<br />
Sample spectra<br />
RGS 600 ks, Detmers et al. 2011 (paper III)<br />
Example: AGN outflow Mrk 509<br />
(Detmers et al. 2011)<br />
99<br />
100<br />
More on photoionised plasmas<br />
Photoionised plasmas<br />
• Irradiated plasma<br />
• Two balance equations:<br />
Photons:<br />
Photo-ionisation<br />
Heating by photoelectrons<br />
Electrons:<br />
Radiative<br />
recombination<br />
(electron capture)<br />
Cooling by collisional<br />
excitation (followed<br />
by line radiation)<br />
101<br />
102
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