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Most baryonic matter in the universe exists in gaseous form and can be foundin structures such as galactic halos and the low-density intergalactic medium.proposed-ray spectroscopy missions such as Athena, Arcus, and Lynx will havethe capability to identify absorption lines in spectra toward bright activegalactic nuclei (AGNs), which can be used as a tool to probe this missingmatter. In this study, we examine the optical fields surrounding 15 primaryobserving targets and identify the foreground galaxies and galaxy groups thatare potential hosts of absorption. We record the basic properties of thepotential host and their angular and physical separation from the AGN line ofsight. This process is done by marking the location of various galaxies andgroups in optical images of the field surrounding the target and plotting theirangular separation vs. redshift to gauge physical proximity to the backgroundsource. We identify the surrounding objects according to those which havemeasured redshifts and those that require them.

The Hosts of X-ray Absorption Lines Toward AGNs