Soft X-ray transmission of optical blocking filters for the X-ray CCD cameras onboard Astro-E 2

Abstract

We measured soft X-ray transmission of Optical Blocking Filters for Charge Coupled Device cameras, which will be launched as focal plane detectors of X-ray telescopes onboard the Japanese fifth X-ray astronomical satellite, Astro-E 2. The filters were made from polyimide coated with Al. The X-ray absorption fine structures at the K edges of C, N, O and Al were measured. The depth of the absorption edge of O was deep, compared to the other elements of polyimide. This is the evidence of the oxidation of Al. r

Soft x-ray response of x-ray CCD camera XIS onboard Astro-E2

“…We share the calibration task, low energy part (0.2-2.2keV) at Osaka and high energy part (above 1.5keV) at Kyoto. Note that the calibration of the optical blocking filters (OBF) were already done as described in Kitamoto et al 4 , and the OBF were not installed in the XIS cameras during the calibration phase at Osaka and Kyoto.…”