Effective area calibration of the nuclear spectroscopic telescope array (NuSTAR)

Kristin K. Madsen; Walter Cook; Karl Forster; Brian Grefenstette; Fiona Harrison; Hiromasa Miyasaka; Sean Pike

doi:10.1117/12.2313675

6 July 2018 Effective area calibration of the nuclear spectroscopic telescope array (NuSTAR)

Kristin K. Madsen, Walter Cook, Karl Forster, Brian Grefenstette, Fiona Harrison, Hiromasa Miyasaka, Sean Pike

Proceedings Volume 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray; 106991W (2018) https://doi.org/10.1117/12.2313675
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The Nuclear Spectroscopic Telescope ARray (NuSTAR) has been in orbit for 6 years, and with the calibration data accumulated over that period we have taken a new look at the effective area calibration. The NuSTAR 10-m focal length is achieved using an extendible mast, which flexes due to solar illumination. This results in individual observations sampling a range of off-axis angles rather than a particular off-axis angle. In our new approach, we have split over 50 individual Crab observations into segments at particular off-axis angles. We combine segments from different observations at the same off-axis angle to generate a new set of synthetic spectra, which we use to calibrate the vignetting function of the optics against the canonical Crab spectrum.

Conference Presentation

Citation Download Citation

Kristin K. Madsen, Walter Cook, Karl Forster, Brian Grefenstette, Fiona Harrison, Hiromasa Miyasaka, and Sean Pike "Effective area calibration of the nuclear spectroscopic telescope array (NuSTAR)", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106991W (6 July 2018); https://doi.org/10.1117/12.2313675

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