Paper 13093-58
In-orbit performance of the XMA for XRISM/Resolve
Abstract
The in-orbit performance verification and calibration of the X-ray Mirror Assembly (XMA) on the XRISM satellite are ongoing. The optical performance of the XMA is being measured with bright point-like or bright small enough sources in orbit. This paper reports the preliminary results for the XMA of Resolve (Resolve- XMA). The in-orbit on-axis and off-axis (1.8′–9′ away from the aimpoint) Point Spread Function (PSF) of the Resolve-XMA were measured using 3C 273 and Cyg X-2, respectively. No significant changes were found in the PSF compared to on-ground results, indicating that the Resolve-XMA is functioning as expected (HPD ∼ 1.3′). For the Effective Area (EA) calibration, XRISM observed 3C 273 alongside other satellites. The Resolve spectrum of 3C 273 is well reproduced by an absorbed power law. While the best-fit photon index is consistent with that measured by NuSTAR, the flux is 5% higher than the NuSTAR measurement. In-orbit stray light observation was conducted with Crab at 60′ off from the aimpoint, and a signature of stray light on Resolve was detected. The observation of Resolve optical search has not yet been performed, and GX 3+1 has been proposed as the target.
Presenter
NASA Goddard Space Flight Ctr. (United States)
Dr. Takayuki Hayashi has been working on the X-ray Mirror Assembly (XMA) of the X-Ray Imaging and Spectroscopy Mission (XRISM) project. Two XMAs are equipped with the XRISM satellite and one of them is for an X-ray micro-calorimeter (Resolve) and the other one is for an X-ray CCD (Xtend). Dr. Hayashi completed the XMA ground calibration in May of 2022 at the 100m X-ray beamline in the Goddard Space Flight Center and delivered the XMAs to Japan where the spacecraft was launched. Dr. Hayashi is leading the development of the Calibration Data Base (CalDB) of the XMA and the analysis of the XRISM initial inflight data.