X-RAY SPECTROSCOPY
AND ATOMIC DATA
Current Status
Features of the X-Ray
Band:
Highly Ionized Atoms
A New Era in X-Ray
Astrophysics:
Chandra and XMM-Newton
The Difference High Spectral Resolution Makes (Capella)
Stellar Coronae:
Hot, Collisional X-Ray Sources
Coronal Steady-State Approximations
Coronal Steady-State Approximations
Stellar Coronae
(cont.):
Temperatures and Abundances
Coronal Abundances (cont.)
Fe-L uncertainties most suspect
Galaxy
Clusters:
Absence of the Cooling Flows
Dielectronic Recombination (DR): The weak link in the ioniz. balance
When the coronal approximation breaks down …
Beyond the Coronal Regime (cont.) Density Diagnostics
Can we trust rates for
transition
among excited levels?
The world beyond Fe-L (e.g. Ar)
Collisional Plasmas:
Atomic Data Status
Spectroscopic Measurements
in
Photoionized Plasma
1s-2p (Ka) Inner-Shell Absorption
1s-2p Inner-Shell Line Comparison
Need for Laboratory
Experiments
Z Pinch (& Laser Plasma)
Inner-Shell Absorption
(cont.)
Fe M-shell 2p-3d UTA
Type II AGN
(cont.)
Measuring Elemental Abundances