Browsing by Author "Kallman, Timothy R."
Now showing items 1-4 of 4
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Carbon X-ray absorption in the local ISM: Fingerprints in X-ray Novae spectra
Gatuzz, Efrain; Ness, Jan-Uwe; Gorczyca, Thomas W.; Hasoglu, Muhammet Fatih; Kallman, Timothy R.; Garcia, Javier A. (OXFORD UNIV PRESS, 2018-09)We present a study of the C K-edge using high-resolution LETGS Chandra spectra of four novae during their super-soft-source (SSS) phase. We identified absorption lines due to C II K alpha, C III K alpha, and C III K beta ... -
A comprehensıve x-ray absorptıon model for atomıc oxygen
Gorczyca, Thomas W.; Bautista, Manuel A.; Hasoglu, Muhammet Fatih; Garcia, Javier A.; Gatuzz, Efrain; Kaastra, JS; Kallman, Timothy R.; Manson, S. T.; Mendoza, Claudio; Raassen, A. J. J.; De Vries, C. P.; Zatsarinny, Oleg (Iop Publıshıng Ltd, 2013-12-10)An analytical formula is developed to accurately represent the photoabsorption cross section of O I for all energies of interest in X-ray spectral modeling. In the vicinity of the K edge, a Rydberg series expression is ... -
K-SHELL PHOTOABSORPTION OF MAGNESIUM IONS
Hasoglu, Muhammet Fatih; Abdel-Naby, Shahin A.; Gatuzz, Efrain; Garcia, Javier A.; Kallman, Timothy R.; Mendoza, Claudio; Gorczyca, Thomas W. (IOP PUBLISHING LTD, 2014-09)X-ray photoabsorption cross sections have been computed for all magnesium ions with three or more electrons using the R-matrix method. A comparison with other available data for Mg II-Mg x shows good qualitative agreement ... -
Sulphur x-ray absorption in the local ısm
Gatuzz, Efrain; Gorczyca T.W.; Hasoglu M.F.; Costantini E.; García, Javier A.; Kallman, Timothy R. (Oxford University Press, 1 January )We present a study S K-edge using high-resolution HETGS Chandra spectra of 36 low-mass X-ray binaries. For each source, we have estimated column densities for S i, S ii, S iii, S xiv, S xv, and S xvi ionic species, which ...
