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  Observations of a GX 301-2 Apastron Flare with the X-Calibur Hard X-Ray Polarimeter Supported by NICER, the Swift XRT and BAT, and Fermi GBM

Abarr, Q., Baring, M., Beheshtipour, B., Beilicke, M., deGeronimo, G., Dowkontt, P., et al. (2020). Observations of a GX 301-2 Apastron Flare with the X-Calibur Hard X-Ray Polarimeter Supported by NICER, the Swift XRT and BAT, and Fermi GBM. The Astrophysical Journal, 891(1): 70. doi:10.3847/1538-4357/ab672c.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-025A-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-025B-2
Genre: Journal Article

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 Creators:
Abarr, Q., Author
Baring, M., Author
Beheshtipour, B.1, Author              
Beilicke, M., Author
deGeronimo, G., Author
Dowkontt, P., Author
Errando, M., Author
Guarino, V., Author
Iyer, N., Author
Kislat, F., Author
Kiss, M., Author
Kitaguchi, T., Author
Krawczynski, H., Author
Lanzi, J., Author
Li, S., Author
Lisalda, L., Author
Okajima, T., Author
Pearce, M., Author
Press, L., Author
Rauch, B., Author
Stuchlik, D., AuthorTakahashi, H., AuthorTang, J., AuthorUchida, N., AuthorWest, A., AuthorJenke, P., AuthorKrimm, H., AuthorLien, A., AuthorMalacaria, C., AuthorMiller, J. M., AuthorWilson-Hodge, C., Author more..
Affiliations:
1Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2630691              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,High Energy Physics - Experiment, hep-ex
 Abstract: The accretion-powered X-ray pulsar GX 301-2 was observed with the balloon-borne X-Calibur hard X-ray polarimeter during late December 2018, with contiguous observations by the NICER X-ray telescope, the Swift X-ray Telescope and Burst Alert Telescope, and the Fermi Gamma-ray Burst Monitor spanning several months. The observations detected the pulsar in a rare apastron flaring state coinciding with a significant spin-up of the pulsar discovered with the Fermi GBM. The X-Calibur, NICER, and Swift observations reveal a pulse profile strongly dominated by one main peak, and the NICER and Swift data show strong variation of the profile from pulse to pulse. The X-Calibur observations constrain for the first time the linear polarization of the 15-35 keV emission from a highly magnetized accreting neutron star, indicating a polarization degree of (27+38-27)% (90% confidence limit) averaged over all pulse phases. We discuss the spin-up and the X-ray spectral and polarimetric results in the context of theoretical predictions. We conclude with a discussion of the scientific potential of future observations of highly magnetized neutron stars with the more sensitive follow-up mission XL-Calibur.

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 Dates: 2020-01-102020
 Publication Status: Published in print
 Pages: Accepted for publication in the Astrophysical Journal. 20 pages, 19 figures, 4 tables
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 2001.03581
DOI: 10.3847/1538-4357/ab672c
URI: http://arxiv.org/abs/2001.03581
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 891 (1) Sequence Number: 70 Start / End Page: - Identifier: -