Pile-up simulator for XRISM/Xtend

Tomokage Yoneyama; Tsubasa Tamba; Hirokazu Odaka; Aya Bamba; Hiroshi Murakami; Koji Mori; Yukikatsu Terada; Masayoshi Nobukawa; Tsunefumi Mizuno

doi:10.1117/12.3018665

21 August 2024 Pile-up simulator for XRISM/Xtend

Tomokage Yoneyama, Tsubasa Tamba, Hirokazu Odaka, Aya Bamba, Hiroshi Murakami, Koji Mori, Yukikatsu Terada, Masayoshi Nobukawa, Tsunefumi Mizuno

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130935Y (2024) https://doi.org/10.1117/12.3018665
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

In X-ray astronomy, most observatories utilize multi-pixel photon-counting devices to obtain spatial, timing, and energy information of X-ray photons radiated by astronomical objects. When a photon-counting device observe a bright source, we face an unavoidable problem called pile-up. Pile-up leads to mistakes in the observational properties of the source, mainly an apparent decrease in the X-ray flux. X-ray telescopes utilizing CCDs as multi-pixel photon-counting devices for imaging and spectroscopy, such as ASCA, Chandra, XMM-Newton, and Suzaku, have operating modes to avoid pile-up for bright sources. X-Ray Imaging and Spectroscopy Mission (XRISM) has two X-ray telescopes, one of which is Xtend, a CCD camera with a wide field-of-view (FOV) of 38 arcmin square. Xtend has three operating modes: full window mode with a frame exposure of ∼4 sec, 1/8 window mode with ∼0.5 sec and reduced FOV, and 1/8 window mode with burst option, whose frame exposure is reduced to ∼0.06 s. Observers need to select the operating mode according to their target fluxes and scientific purposes. We develop the pile-up simulator for Xtend to provide a quantitative assessment of pile-up according to the fluxes, spectra, and shapes of X-ray sources. The simulator is based on the Monte-Carlo simulation utilizing the GEANT4 framework. We derived the 10% pile-up limits for a point source of 7.8, 66.2, and 447.9 counts s⁻¹ for full window, 1/8 window, and 1/8 window mode with burst option, respectively by assuming the Crab spectrum. We present further simulations for a diffuse source and monochromatic spectra.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Tomokage Yoneyama, Tsubasa Tamba, Hirokazu Odaka, Aya Bamba, Hiroshi Murakami, Koji Mori, Yukikatsu Terada, Masayoshi Nobukawa, and Tsunefumi Mizuno "Pile-up simulator for XRISM/Xtend", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130935Y (21 August 2024); https://doi.org/10.1117/12.3018665

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available