Electron distributions in X-Ray plasmas: spectral diagnostics with the 3s/3d line ratio in Fe XVII
| dc.creator | Chen, Guo-Xin | |
| dc.creator | Pradhan, Anil K. | |
| dc.date | 2005-10-18 | |
| dc.date.accessioned | 2026-07-07T06:43:56Z | |
| dc.date.available | 2026-07-07T06:43:56Z | |
| dc.description | Efforts to benchmark astrophysical observations with X-ray laboratory measurements have been stymied by observed and measured differences of up to a factor of two in the ratio '3s/3d' of Fe XVII lines at ~17 Åand ~15 Årespectively. Using the electron distribution function (EDF) as a new physical parameter, we compute the Fe XVII line ratios and account for these differences. Based on large-scale relativistic close coupling calculations using the Breit-Pauli R-matrix method, revealing the precise effect of resonances in collisional excitation, we employ collisional-radiative models using cross sections convolved with both the Gaussian and the Maxwellian EDF. Comparison with astrophysical observations and laboratory measurements demonstrates that (a) the 3s/3d line ratio depends not only on the EDF but also on the electron temperature/energy of the source, (b) plasma conditions in experimental measurements and astrophysical observations may be quite different, and (c) departure from a Maxwellian should manifest itself in, and be used as a diagnostics of, particle distributions in plasmas. | |
| dc.description | 5 pages, 2 figures, submitted to MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0510534 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0510534 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/102608 | |
| dc.subject | Astrophysics | |
| dc.title | Electron distributions in X-Ray plasmas: spectral diagnostics with the 3s/3d line ratio in Fe XVII | |
| dc.type | text |