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Discovery of Gamma-ray Pulsations from the Transitional Redback PSR J1227-4853

Johnson, T. J., Ray, P. S., Roy, J., Cheung, C. C., Harding, A. K., Pletsch, H. J., et al. (2015). Discovery of Gamma-ray Pulsations from the Transitional Redback PSR J1227-4853. The Astrophysical Journal, 806(1): 91. doi:10.1088/0004-637X/806/1/91.

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Genre: Journal Article

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Creators:
Johnson, T. J., Author
Ray, P. S., Author
Roy, J., Author
Cheung, C. C., Author
Harding, A. K., Author
Pletsch, H. J.1, Author
Fort, S., Author
Camilo, F., Author
Deneva, J., Author
Bhattacharyya, B., Author
Stappers, B. W., Author
Kerr, M., Author
Affiliations:
1Pulsar Observation and Data Analysis, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2253649

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract: The 1.69 ms spin period of PSR J1227-4853 was recently discovered in radio observations of the low-mass X-ray binary XSS J12270-4859 following the announcement of a possible transition to a rotation-powered millisecond pulsar state, inferred from decreases in optical, X-ray, and gamma-ray flux from the source. We report the detection of significant (5$\sigma$) gamma-ray pulsations after the transition, at the known spin period, using ~1 year of data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The gamma-ray light curve of PSR J1227-4853 can be fit by one broad peak, which occurs at nearly the same phase as the main peak in the 1.4 GHz radio profile. The partial alignment of light-curve peaks in different wavebands suggests that at least some of the radio emission may originate at high altitude in the pulsar magnetosphere, in extended regions co-located with the gamma-ray emission site. We folded the LAT data at the orbital period, both pre- and post-transition, but find no evidence for significant modulation of the gamma-ray flux. Analysis of the gamma-ray flux over the mission suggests an approximate transition time of 2012 November 30. Continued study of the pulsed emission and monitoring of PSR J1227-4853, and other known redback systems, for subsequent flux changes will increase our knowledge of the pulsar emission mechanism and transitioning systems.

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Dates: 2015-02-242015-04-272015
Publication Status: Published in print
Pages: 5 figures, 1 table, accepted for publication in ApJ, updated to reflect accepted version and add additional coauthor
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 806 (1) Sequence Number: 91 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3