Mastroserio, G. and Grefenstette, B. W. and Thalhammer, P. and Buisson, D. J. K. and Brumback, M. C. and Ludlam, R. M. and Connors, R. M. T. and García, J. A. and Grinberg, V. and Madsen, K. K. and Miyasaka, H. and Tomsick, J. A. and Wilms, J. (2022) NuSTAR Spectral Analysis beyond 79 keV with Stray Light. Astrophysical Journal, 941 (1). Art. No. 35. ISSN 0004-637X. doi:10.3847/1538-4357/ac8c94. https://resolver.caltech.edu/CaltechAUTHORS:20230203-893210800.24
Full text is not posted in this repository. Consult Related URLs below.
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20230203-893210800.24
Abstract
Due to the structure of the NuSTAR telescope, photons at a large off axis (>1°) can reach the detectors directly (stray light), without passing through the instrument optics. At these off-axis angles NuSTAR essentially turns into a collimated instrument and the spectrum can extend to energies above the Pt K edge (79 keV) of the multilayers, which limits the effective area bandpass of the optics. We present the first scientific spectral analysis beyond 79 keV using a Cygnus X-1 observation in StrayCats: the catalog of stray light observations. This serendipitous stray light observation occurred simultaneously with an INTEGRAL observation. When the spectra are modeled together in the 30–120 keV energy band, we find that the NuSTAR stray light flux is well calibrated and constrained to be consistent with the INTEGRAL flux at the 90% confidence level. Furthermore, we explain how to treat the background of the stray light spectral analysis, which is especially important at high energies.
| Item Type: | Article | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Related URLs: |
| ||||||||||||||||||||||||||||
| ORCID: |
| ||||||||||||||||||||||||||||
| Additional Information: | G.M. would like to thank Lorenzo Natalucci for the helpful comments. J.A.G. acknowledges support from NASA grant 80NSSC19K1020 and from the Alexander von Humboldt Foundation. The material is based upon work supported by NASA under award No. 80GSFC21M0002. This work was supported by NASA under grant No. 80NSSC19K1023 issued through the NNH18ZDA001N Astrophysics Data Analysis Program (ADAP). This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). | ||||||||||||||||||||||||||||
| Group: | Space Radiation Laboratory, NuSTAR | ||||||||||||||||||||||||||||
| Funders: |
| ||||||||||||||||||||||||||||
| Issue or Number: | 1 | ||||||||||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac8c94 | ||||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20230203-893210800.24 | ||||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20230203-893210800.24 | ||||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||
| ID Code: | 119018 | ||||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||
| Deposited By: | Research Services Depository | ||||||||||||||||||||||||||||
| Deposited On: | 24 Feb 2023 21:29 | ||||||||||||||||||||||||||||
| Last Modified: | 24 Feb 2023 21:29 |
Repository Staff Only: item control page
