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X-ray Transmission Through Photoionized Gas with Moderate Thomson Optical Depth
Taya Govreen-Segal, Ehud Nakar, Eliot Quataert
https://arxiv.org/abs/2509.08119 https://

X-ray Transmission Through Photoionized Gas with Moderate Thomson Optical Depth
We model the absorption of X-rays by gas obscuring the source and photoionized by it. We consider a broad range of column densities, including both Thomson-thin and Thomson-thick media. For the Thomson thin regime, we derive a simple criterion, based on the source luminosity and spectrum and the medium radius and column density, that distinguish between the following cases: (i) The absorption can be modeled well by a neutral medium; (ii) The radiation ionizes its way through the medium and no a…

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