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Extending the Baseline for SMC X-1's Spin and Orbital Behavior with NuSTAR Stray Light

Brumback, McKinley C. and Grefenstette, Brian W. and Buisson, Douglas J. K. and Bachetti, Matteo and Connors, Riley and García, Javier A. and Jaodand, Amruta and Krivonos, Roman and Ludlam, Renee and Madsen, Kristin K. and Mastroserio, Guglielmo and Tomsick, John A. and Wik, Daniel (2022) Extending the Baseline for SMC X-1's Spin and Orbital Behavior with NuSTAR Stray Light. Astrophysical Journal, 926 (2). Art. No. 187. ISSN 0004-637X. doi:10.3847/1538-4357/ac4d24.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Brumback, McKinley C.0000-0002-4024-6967
Grefenstette, Brian W.0000-0002-1984-2932
Buisson, Douglas J. K.0000-0002-5341-6929
Bachetti, Matteo0000-0002-4576-9337
Connors, Riley0000-0002-8908-759X
García, Javier A.0000-0003-3828-2448
Jaodand, Amruta0000-0002-3850-6651
Krivonos, Roman0000-0003-2737-5673
Ludlam, Renee0000-0002-8961-939X
Madsen, Kristin K.0000-0003-1252-4891
Mastroserio, Guglielmo0000-0003-4216-7936
Tomsick, John A.0000-0001-5506-9855
Wik, Daniel0000-0001-9110-2245
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 November 12; revised 2022 January 6; accepted 2022 January 17; published 2022 February 24. The authors thank the anonymous referee for their time in reading the manuscript and providing helpful comments. M.C.B. would like to thank J. Thorstensen for communication about calculating orbital ephemerides and acknowledges support from NASA funding award No. 80NSSC21K0263. R.K. acknowledges support from the Russian Science Foundation grant 19-12-00369. R.L. acknowledges the support of NASA through the Hubble Fellowship Program grant HST-HF2-51440.001. Software: HEAsoft (v6.29c; HEASARC 2014), NuSTARDAS, Stingray (Huppenkothen et al. 2019), HENDRICS (Bachetti 2018), MaLTPyNT (Bachetti 2015), nustar-gen-utils.
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Russian Science Foundation19-12-00369
NASA Hubble FellowshipHST-HF2-51440.001
NASA Einstein FellowshipUNSPECIFIED
Subject Keywords:X-ray binary stars; High mass x-ray binary stars; Pulsars; Neutron stars
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: X-ray binary stars (1811); High mass x-ray binary stars (733); Pulsars (1306); Neutron stars (1108)
Record Number:CaltechAUTHORS:20220225-724712000
Persistent URL:
Official Citation:McKinley C. Brumback et al 2022 ApJ 926 187
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113617
Deposited By: George Porter
Deposited On:25 Feb 2022 20:43
Last Modified:25 Feb 2022 20:43

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