Simulated X-ray Camera Design for Transient Sky Monitoring

The study focuses on simulations of a 2 x 1.5D coded aperture camera for X-ray astronomy, intended for use as a Wide Field Monitor (WFM). The WFM is designed to monitor the variable X-ray sky for transient activity, leveraging two perpendicular one-dimensional coded aperture cameras. The design offers a fine angular resolution in one direction (5 arcmin) and a coarser resolution in the other (5 degrees). The WFM concept has been considered for several space-borne X-ray observatory missions, including LOFT, eXTP, Strobe-X, ARCO, and LEM-X. The research explores two decoding algorithms, iterative removal of sources (IROS) and maximum likelihood method (MLM), to optimize the instrument's imaging performance. IROS is suited for determining the point source configuration, while MLM is used for determining source fluxes. The simulations include detector responses to the X-ray sky and signal processing by the front-end and back-end electronics. The WFM's capabilities enable the identification of new cosmic X-ray sources, such as X-ray novae and gamma-ray bursts, and the detection of unusual behavior in persistent cosmic X-ray sources. The instrument's potential to detect electromagnetic counterparts to gravitational wave events from merging compact objects is particularly significant. Further research should focus on refining the decoding algorithms and validating the simulations with observational data. The development of the WFM represents a significant step towards improving our ability to monitor and understand the dynamic X-ray sky.

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