Inflight calibration of SRG/ART-XC point spread function at large off-axis angles

IF 2.2 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2025-06-03 DOI:10.1007/s10686-025-10008-w

R. Krivonos, R. Burenin, E. Filippova, I. Lapshov, A. Tkachenko, A. Semena, I. Mereminskiy, V. Arefiev, A. Lutovinov, B. D. Ramsey, J. J. Kolodziejczak, D. A. Swartz, C.-T. Chen, S. R. Ehlert, A. Vikhlinin

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引用次数: 0

Abstract

The knowledge of the point spread function (PSF) of the Mikhail Pavlinsky Astronomical Roentgen Telescope–X-ray Concentrator (ART-XC) telescope aboard the Spectrum-Roentgen-Gamma (SRG) observatory plays an especially crucial role in the detection of point X-ray sources in the all-sky survey and the studies of extended X-ray objects with low surface brightness. In this work, we calibrate the far off-axis shape of the ART-XC PSF using in-flight data of Sco X-1 and the Crab Nebula, in all-sky survey or scan mode, respectively. We demonstrate that the so-called “slewing” ART-XC PSF (in contrast to the on-axis PSF), in convolution with the detector pixels, is consistent with ground calibration performed at the Marshall Space Flight Center, and can be used to model the PSF up to large off-axis distances in all-sky survey or scan modes. The radial profile of the Crab Nebula in the 4−12 keV band shows an extended structure out to \( \sim \)150” and is consistent with Sco X-1 at larger off-axis angles. Finally, we performed an analytic parametrization of the slewing ART-XC PSF as a function of energy.

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SRG/ART-XC大离轴角点扩散函数的飞行标定

在全天巡天中探测点x射线源和研究低表面亮度的扩展x射线天体时，帕夫林斯基天文伦琴望远镜- x射线集中器（arts - xc）的点扩展函数（PSF）的知识起着至关重要的作用。在这项工作中，我们分别使用Sco X-1和蟹状星云的飞行数据在全天巡天或扫描模式下校准ART-XC PSF的远轴形状。我们证明了所谓的“回转”ART-XC PSF（与轴上PSF相反）与探测器像素卷积，与马歇尔太空飞行中心进行的地面校准一致，并且可用于在全天巡天或扫描模式下对PSF进行大的离轴距离建模。蟹状星云在4−12 keV波段的径向轮廓显示出延伸到\( \sim \) 150”的结构，并且在较大的离轴角上与Sco X-1一致。最后，我们将回转ART-XC PSF作为能量函数进行了解析参数化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.