X-ray spectra of the Fe-L complex. II. Atomic data constraints from the EBIT experiment and X-ray grating observations of Capella
Journal
Date Issued
2020
Author(s)
Gu, Liyi
•
Shah, Chintan
•
Mao, Junjie
•
Raassen, Ton
•
de Plaa, Jelle
•
•
Akamatsu, Hiroki
•
Werner, Norbert
•
Simionescu, Aurora
•
Mernier, François
•
Sawada, Makoto
•
Mohanty, Pranav
•
Amaro, Pedro
•
Gu, Ming Feng
•
Porter, F. Scott
•
Crespo López-Urrutia, José R.
•
Kaastra, Jelle S.
Abstract
The Hitomi results for the Perseus cluster have shown that accurate atomic models are essential to the success of X-ray spectroscopic missions and just as important as the store of knowledge on instrumental calibration and astrophysical modeling. Preparing the models requires a multifaceted approach, including theoretical calculations, laboratory measurements, and calibration using real observations. In a previous paper, we presented a calculation of the electron impact cross sections on the transitions forming the Fe-L complex. In the present work, we systematically tested the calculation against cross-sections of ions measured in an electron beam ion trap experiment. A two-dimensional analysis in the electron beam energies and X-ray photon energies was utilized to disentangle radiative channels following dielectronic recombination, direct electron-impact excitation, and resonant excitation processes in the experimental data. The data calibrated through laboratory measurements were further fed into a global modeling of the Chandra grating spectrum of Capella. We investigated and compared the fit quality, as well as the sensitivity of the derived physical parameters to the underlying atomic data and the astrophysical plasma modeling. We further list the potential areas of disagreement between the observations and the present calculations, which, in turn, calls for renewed efforts with regard to theoretical calculations and targeted laboratory measurements.
Volume
641
Start page
A93
Issn Identifier
0004-6361
Ads BibCode
2020A&A...641A..93G
Rights
open.access
File(s)![Thumbnail Image]()
![Thumbnail Image]()
Loading...
Name
Gu20_Liyi_Fe-L2.pdf
Description
PDF Editoriale
Size
7.49 MB
Format
Adobe PDF
Checksum (MD5)
a0ce2edc346e232f1841dcd4b1cca03d
Loading...
Name
Gu20_Liyi_Fe-L2oa.pdf
Description
Open Access arXiv
Size
7.95 MB
Format
Adobe PDF
Checksum (MD5)
846db54b8815438d054d7d980c8d572b