In-flight PSF calibration of the NuSTAR hard X-ray optics

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

doi:10.1117/12.2055481

In-flight PSF calibration of the NuSTAR hard X-ray optics

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

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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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 less than or similar to 3 for extraction apertures of R greater than or similar to 60" with no significant energy dependence. We also show that the PSF of the NubSTAR optics has been stable over a period of similar to 300 days during its in-orbit operation.

Original language	English
Title of host publication	Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray
Editors	Tadayuki Takahashi, Jan-Willem A. den Herder, Mark Bautz
Number of pages	10
Volume	9144
Publisher	SPIE - International Society for Optical Engineering
Publication date	2014
Article number	91441Q
DOIs	https://doi.org/10.1117/12.2055481
Publication status	Published - 2014
Event	SPIE Astronomical Telescopes + Instrumentation 2014 - Palais des congrés de Montréal , Montreal, Canada Duration: 22 Jun 2014 → 27 Jun 2014

Conference

Conference	SPIE Astronomical Telescopes + Instrumentation 2014
Location	Palais des congrés de Montréal
Country/Territory	Canada
City	Montreal
Period	22/06/2014 → 27/06/2014

Series	Proceedings of SPIE - The International Society for Optical Engineering
ISSN	0277-786X

Bibliographical note

Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

NuSTAR
X-ray optics
Point Spread Function (PSF)
Half Power Diameter (HPD)
Calibration

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An, H., Madsen, K. K., Westergaard, N. J., Boggs, S. E., Christensen, F. E., Craig, W. W., Hailey, C. J., Harrison, F. A., Stern, D. K., & Zhang, W. W. (2014). In-flight PSF calibration of the NuSTAR hard X-ray optics. In T. Takahashi, J.-W. A. den Herder, & M. Bautz (Eds.), Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray (Vol. 9144). Article 91441Q SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2055481

An, Hongjun ; Madsen, Kristin K. ; Westergaard, Niels J. et al. / In-flight PSF calibration of the NuSTAR hard X-ray optics. Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray. editor / Tadayuki Takahashi ; Jan-Willem A. den Herder ; Mark Bautz. Vol. 9144 SPIE - International Society for Optical Engineering, 2014. (Proceedings of SPIE - The International Society for Optical Engineering).

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title = "In-flight PSF calibration of the NuSTAR hard X-ray optics",

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 less than or similar to 3 for extraction apertures of R greater than or similar to 60{"} with no significant energy dependence. We also show that the PSF of the NubSTAR optics has been stable over a period of similar to 300 days during its in-orbit operation.",

keywords = "NuSTAR, X-ray optics, Point Spread Function (PSF), Half Power Diameter (HPD), Calibration",

author = "Hongjun An and Madsen, {Kristin K.} and Westergaard, {Niels J.} and Boggs, {Steven E.} and Christensen, {Finn E.} and Craig, {William W.} and Hailey, {Charles J.} and Harrison, {Fiona A.} and Stern, {Daniel K.} and Zhang, {William W.}",

note = "Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.; SPIE Astronomical Telescopes + Instrumentation 2014 ; Conference date: 22-06-2014 Through 27-06-2014",

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doi = "10.1117/12.2055481",

language = "English",

volume = "9144",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE - International Society for Optical Engineering",

editor = "Takahashi, {Tadayuki } and {den Herder}, { Jan-Willem A. } and { Bautz}, Mark",

booktitle = "Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray",

}

An, H, Madsen, KK, Westergaard, NJ, Boggs, SE, Christensen, FE, Craig, WW, Hailey, CJ, Harrison, FA, Stern, DK & Zhang, WW 2014, In-flight PSF calibration of the NuSTAR hard X-ray optics. in T Takahashi, J-WA den Herder & M Bautz (eds), Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray. vol. 9144, 91441Q, SPIE - International Society for Optical Engineering, Proceedings of SPIE - The International Society for Optical Engineering, SPIE Astronomical Telescopes + Instrumentation 2014, Montreal, Quebec, Canada, 22/06/2014. https://doi.org/10.1117/12.2055481

In-flight PSF calibration of the NuSTAR hard X-ray optics. / An, Hongjun; Madsen, Kristin K.; Westergaard, Niels J. et al.
Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray. ed. / Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz. Vol. 9144 SPIE - International Society for Optical Engineering, 2014. 91441Q (Proceedings of SPIE - The International Society for Optical Engineering).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - In-flight PSF calibration of the NuSTAR hard X-ray optics

AU - An, Hongjun

AU - Madsen, Kristin K.

AU - Westergaard, Niels J.

AU - Boggs, Steven E.

AU - Christensen, Finn E.

AU - Craig, William W.

AU - Hailey, Charles J.

AU - Harrison, Fiona A.

AU - Stern, Daniel K.

AU - Zhang, William W.

N1 - Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

PY - 2014

Y1 - 2014

N2 - 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 less than or similar to 3 for extraction apertures of R greater than or similar to 60" with no significant energy dependence. We also show that the PSF of the NubSTAR optics has been stable over a period of similar to 300 days during its in-orbit operation.

AB - 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 less than or similar to 3 for extraction apertures of R greater than or similar to 60" with no significant energy dependence. We also show that the PSF of the NubSTAR optics has been stable over a period of similar to 300 days during its in-orbit operation.

KW - NuSTAR

KW - X-ray optics

KW - Point Spread Function (PSF)

KW - Half Power Diameter (HPD)

KW - Calibration

U2 - 10.1117/12.2055481

DO - 10.1117/12.2055481

M3 - Article in proceedings

VL - 9144

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray

A2 - Takahashi, Tadayuki

A2 - den Herder, Jan-Willem A.

A2 - Bautz, Mark

PB - SPIE - International Society for Optical Engineering

T2 - SPIE Astronomical Telescopes + Instrumentation 2014

Y2 - 22 June 2014 through 27 June 2014

ER -

An H, Madsen KK, Westergaard NJ, Boggs SE, Christensen FE, Craig WW et al. In-flight PSF calibration of the NuSTAR hard X-ray optics. In Takahashi T, den Herder JWA, Bautz M, editors, Proceedings of the SPIE Astronomical Telescopes + Instrumentation 2014: Ultraviolet to Gamma Ray. Vol. 9144. SPIE - International Society for Optical Engineering. 2014. 91441Q. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2055481

In-flight PSF calibration of the NuSTAR hard X-ray optics

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Keywords

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