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Titolo: X-ray photoabsorption in KLL resonances of OVI and abundance analysis
Autore: Pradhan, AK;
- Indirizzi:
- Ohio State Univ, Dept Astron, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 Dept Astron, Columbus, OH 43210 USA
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 2,
volume: 545,
anno: 2000,
parte:, 2
pagine: L165 - L169
- SICI:
- 0004-637X(200012)545:2<L165:XPIKRO>2.0.ZU;2-Y
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- DIELECTRONIC SATELLITE SPECTRA; IONS;
- Keywords:
- atomic processes; line : formation; line : identification; radiation mechanisms : thermal; ultraviolet : general; X-rays : general;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 25
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Pradhan, AK Ohio State Univ, Dept Astron, 174 W 18th Ave, Columbus, OH 43210 USA Ohio State Univ 174 W 18th Ave Columbus OH USA 43210 43210 USA
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- Citazione:
- A.K. Pradhan, "X-ray photoabsorption in KLL resonances of OVI and abundance analysis", ASTROPHYS J, 545(2), 2000, pp. L165-L169
Abstract
It is shown that photoabsorption via autoionizing resonances may be appreciable and used for abundance analysis. Analogous to spectral lines, the "resonance oscillator strength" f(r) may be defined and evaluated in terms of the differential oscillator strength df/d epsilon that relates bound and continuum absorption. X-ray photoabsorption in KLL (1s2s2p) resonances of O VI is investigated using highly resolved relativistic photoionization cross sections with fine structure. It is found that is comparable to that for UVdipole transition in O VI (2s-2p) and the X-ray (1s(2) S-1(0)-1s2p P-1(1)0) transition in O VII. The dominant O VI (KLL) components lie at 22.05 and 21.87 Angstrom. These predicted absorption features should be detectable bythe Chandra X-Ray Observatory and the X-Ray Multimirror Mission. The combined UV/X-ray spectra of O VI/O VII should yield valuable information on theionization structure and abundances in sources such as the "warm absorber"region of active galactic nuclei and the hot intergalactic medium. Some general implications of resonant photoabsorption are addressed.
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Documento generato il 24/05/13 alle ore 07:35:42