18 July 2016 Observing the WHIM with Athena
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Abstract
We present simulations of the detection probability for absorption lines from ions in the warm and hot ionized medium (WHIM) with Athena in the spectra of Gamma-ray burst afterglows. The simulations are based on Swift XRT lightcurves of these afterglows and are performed using the end-to-end simulation framework SIXTE. We simulate both the case of single and multiple absorption lines, as well as results for line searches in absorption structures from a more complex medium. We show that the Athena X-IFU can detect WHIM lines with strong Ovii lines (equivalent widths larger than 0.14 eV) in spectra containing 3 x 106 counts.
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T. Brand, J. Wilms, T. Dauser, P. Peille, B. Cobo, M. Ceballos, R. A. den Hartog, J. S. Kaastra, P. O'Brien, X. Barcons, L. Piro, J.-W. A. den Herder, D. Barret, "Observing the WHIM with Athena", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99055F (18 July 2016); doi: 10.1117/12.2234442; https://doi.org/10.1117/12.2234442
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