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25 April 2024 |
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Calibration of the NuSTAR High Energy Focusing X-ray Telescope | | Kristin K. Madsen
; Fiona A. Harrison
; Craig Markwardt
; Hongjun An
; Brian W. Grefenstette
; Matteo Bachetti
; Hiromasa Miyasaka
; Takao Kitaguchi
; Varun Bhalerao
; Finn E. Christensen
; William W. Craig
; Felix Fuerst
; Dominic J. Walton
; Charles J. Hailey
; Vikram Rana
; Daniel Stern
; Niels-Jørgen Westergaard
; William Zhang
; | | Date: |
7 Apr 2015 | | Abstract: | We present the calibration of the Nuclear Spectroscopic Telescope Array
(NuSTAR) X-ray satellite. We used the Crab as the primary effective area
calibrator and constructed a piece-wise linear spline function to modify the
vignetting response. The achieved residuals for all off-axis angles and
energies, compared to the assumed spectrum, are typically better than +/-2% up
to 40 keV and 5--10% above due to limited counting statistics. An empirical
adjustment to the theoretical 2D point spread function (PSF) was found using
several strong point sources, and no increase of the PSF half power diameter
(HPD) has been observed since the beginning of the mission. We report on the
detector gain calibration, good to 60 eV for all grades, and discuss the timing
capabilities of the observatory, which has an absolute timing of +/-3ms.
Finally we present cross-calibration results from two campaigns between all the
major concurrent X-ray observatories Chandra, Swift, Suzaku and XMM-Newton,
conducted in 2012 and 2013 on the sources 3C 273 and PKS2155-304, and show that
the differences in measured flux is less than 5% for all instruments with
respect to NuSTAR, with the exception of the Chandra gratings that measure a
flux ~12% higher. | | Source: | arXiv, 1504.1672 | | Services: | Forum | Review | PDF | Favorites | |
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