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Proceedings Paper

In-flight PSF calibration of the NuSTAR hard X-ray optics
Author(s): Hongjun An; Kristin K. Madsen; Niels J. Westergaard; Steven E. Boggs; Finn E. Christensen; William W. Craig; Charles J. Hailey; Fiona A. Harrison; Daniel K. Stern; William W. Zhang
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Paper Abstract

We present results of the point spread function (PSF) calibration of the hard X-ray optics of the Nuclear Spectroscopic Telescope Array (NuSTAR). Immediately post-launch, NuSTAR has observed bright point sources such as Cyg X-1, Vela X-1, and Her X-1 for the PSF calibration. We use the point source observations taken at several off-axis angles together with a ray-trace model to characterize the in-orbit angular response, and find that the ray-trace model alone does not fit the observed event distributions and applying empirical corrections to the ray-trace model improves the fit significantly. We describe the corrections applied to the ray-trace model and show that the uncertainties in the enclosed energy fraction (EEF) of the new PSF model is (approximately less than) 3% for extraction apertures of R (approximately greater than) 60″ with no significant energy dependence. We also show that the PSF of the NuSTAR optics has been stable over a period of ~300 days during its in-orbit operation.

Paper Details

Date Published: 24 July 2014
PDF: 10 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91441Q (24 July 2014); doi: 10.1117/12.2055481
Show Author Affiliations
Hongjun An, McGill Univ. (Canada)
Kristin K. Madsen, Cahill Ctr. for Astronomy and Astrophysics, California Institute of Technology (United States)
Niels J. Westergaard, DTU Space (Denmark)
Steven E. Boggs, Space Sciences Lab., Univ. of California, Berkeley (United States)
Finn E. Christensen, DTU Space (Denmark)
William W. Craig, Space Sciences Lab., Univ. of California, Berkeley (United States)
Lawrence Livermore National Lab. (United States)
Charles J. Hailey, Columbia Univ. (United States)
Fiona A. Harrison, Cahill Ctr. for Astronomy and Astrophysics, California Institute of Technology (United States)
Daniel K. Stern, Jet Propulsion Lab. (United States)
William W. Zhang, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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