Measurement and Modeling of Density-Sensitive Lines of Fe XIII in the Extreme Ultraviolet

• Published in: The Astrophysical journal Vol. 689; no. 1; pp. 646 - 652
• Main Authors: Yamamoto, N, Kato, T, Funaba, H, Sato, K, Tamura, N, Sudo, S, Beiersdorfer, P, Lepson, J. K
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 10.12.2008; IOP
• Subjects: Astronomy; ATOMIC AND MOLECULAR PHYSICS; Earth, ocean, space; Exact sciences and technology; GENERAL AND MISCELLANEOUS; PLASMA DENSITY; R MATRIX; RESOLUTION; SIMULATION; SPECTRA; WAVELENGTHS; Plasma; line: formation; plasmas; atomic data; Line identification; Atomic process; Line formation; atomic processes; Modelling; line: identification; ultraviolet: general
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/592262

We present an analysis of the spectral emission of Fe xiii near 200 Aa. High-resolution spectra were recorded at two densities ([image] and [image]10 super(13) cm super(-3)) in the laboratory and compared to collisional radiative model calculations based on the CHIANTI database, and to models using atomic data from distorted-wave and R-matrix calculations. The Fe xiii lines in this wavelength range are sensitive indicators of plasma density below [image] 10 super(11) cm super( -3). The laboratory data thus test calculations in the astrophysical high-density limit. Significant differences between the measurements and models were found for several line ratios. Differences in the wavelengths employed in the different models also changed the agreement with the measurements. The best agreement was found for comparisons with CHIANTI.