Terrance J. Gaetz,1 Diab Jerius,1 Richard J. Edgar,1 Leon P. Van Speybroeck,1 Daniel A. Schwartz,1 Maxim L. Markevitch,1 S. C. Taylor,2 Norbert S. Schulz2
1Harvard-Smithsonian Ctr. for Astrophysics (United States) 2Massachusetts Institute of Technology (United States)
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Prior to launch, the High Resolution Mirror Assembly (HRMA) of the Chandra X-ray Observatory underwent extensive ground testing at the X-ray Calibration Facility (XRCF) at the Marshall Space Flight Center in Huntsville, Alabama. The resulting data were used to validate a high fidelity raytrace model for the HRMA performance. Further observations made during the post-launch Orbital Activation and Calibration period allow the on-orbit condition of the X-ray optics to be assessed. Based on these ground-based and on-orbit data, we examine the alignment of the X-ray optics based on the off-axis point spread function. We discuss how single-reflection ghost data obtained at XRCF can be used to better constrain the HRMA optical axis data. We examine the vignetting and the single-reflection ghost suppression properties of the telescope. Slight imperfections in alignment lead to a small azimuthal dependence of the off- axis effective area; the morphology of off-axis images also shows an additional small azimuthal dependence varying as 1/2 the position angle.
Terrance J. Gaetz,Diab Jerius,Richard J. Edgar,Leon P. Van Speybroeck,Daniel A. Schwartz,Maxim L. Markevitch,S. C. Taylor, andNorbert S. Schulz
"Orbital verification of the CXO high-resolution mirror assembly alignment and vignetting", Proc. SPIE 4012, X-Ray Optics, Instruments, and Missions III, (18 July 2000); https://doi.org/10.1117/12.391574
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Terrance J. Gaetz, Diab Jerius, Richard J. Edgar, Leon P. Van Speybroeck, Daniel A. Schwartz, Maxim L. Markevitch, S. C. Taylor, Norbert S. Schulz, "Orbital verification of the CXO high-resolution mirror assembly alignment and vignetting," Proc. SPIE 4012, X-Ray Optics, Instruments, and Missions III, (18 July 2000); https://doi.org/10.1117/12.391574