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http://hdl.handle.net/20.500.12386/32096
Titolo: | Extending the Baseline for SMC X-1's Spin and Orbital Behavior with NuSTAR Stray Light | Autori: | Brumback, McKinley C. Grefenstette, Brian W. Buisson, Douglas J. K. BACHETTI, Matteo Connors, Riley García, Javier A. Jaodand, Amruta Krivonos, Roman Ludlam, Renee Madsen, Kristin K. MASTROSERIO, Guglielmo Tomsick, John A. Wik, Daniel |
Data pubblicazione: | 2022 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 926 | Fascicolo: | 2 | Da pagina:: | 187 | Abstract: | StrayCats, the catalog of NuSTAR stray light observations, contains data from bright X-ray sources that fall within crowded source regions. These observations offer unique additional data with which to monitor sources such as X-ray binaries that show variable timing behavior. In this work, we present a timing analysis of stray light data of the high-mass X-ray binary SMC X-1, the first scientific analysis of a single source from the StrayCats project. We describe the process of screening stray light data for scientific analysis, verify the orbital ephemeris, and create both time- and energy-resolved pulse profiles. We find that the orbital ephemeris of SMC X-1 is unchanged and confirm a long-term spin-up rate of ν˙=(2.52±0.03)×10−11 Hz s-1. We also note that the shape of SMC X-1's pulse profile, while remaining double peaked, varies significantly with time and only slightly with energy. | URI: | http://hdl.handle.net/20.500.12386/32096 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ac4d24 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ac4d24 | Bibcode ADS: | 2022ApJ...926..187B | Fulltext: | open |
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