Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dmp.c2007p&link_type=abstract
American Physical Society, DAMOP Meeting, May 16-19, 2001 London, Ontario, Canada Bulletin of the American Physical Society, Vol
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recently, the first prediction and detection of O VI KLL resonances in the X-ray spectra of active galactic nuclei has established that resonance photoabsorption may be employed to determine element abundances in astrophysical sources (A.K. Pradhan, Astrophys. J. Lett. 545, L165, 2000; Lee et al, Astrophys. J. Lett. (submitted).) Accurate `resonance oscillator strengths' barfr are needed for such studies. These may be defined and evaluated in terms of the differential oscillator strength df/dɛ that relates bound and continuum absorption. The barfr are calculated from detailed photoionization cross sections obtained using relativistic close coupling Breit-Pauli R-matrix method. The KLL resonances of interest here are: 1s2p (^3P^o) 2s [^4P^o_1/2,3/2, ^2P^o_1/2,3/2] and 1s2p (^1P^o) 2s [^2P^o_1/2,3/2]. The autoionization and radiative decay rates, and cross sections with and without radiative decay of resonances, are calculated by analysing the poles in the complex dipole matrix elements. The barfr are computed for X-ray photoabsorption in all relevant KLL resonances from the ground level in Li-like C IV, O VI, and Fe XXIV. Resonance spectroscopy, analogous to line spetroscopy, should prove to be a powerful tool for plasma diagnostics. (Partial support from the NSF and NASA is gratefully acknowledged.)
Nahar Sultana
Pradhan Anil
Zhang Honglin
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