THE DISTURBANCE OF A MILLISECOND PULSAR MAGNETOSPHERE

Journal Article · Thu Sep 01 00:00:00 EDT 2016 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8205/828/1/L1· OSTI ID:22654235

Shannon, R. M.; Kerr, M.; Dai, S.; Hobbs, G.; Manchester, R. N.; Reardon, D. J.; Toomey, L. ^[1]; Lentati, L. T. ^[2]; Bailes, M.; Osłowski, S.; Rosado, P. A.; Van Straten, W. ^[3]; Bhat, N. D. R. ^[4]; Coles, W. A. ^[5]; Dempsey, J. ^[6]; Keith, M. J. ^[7]; Lasky, P. D.; Levin, Y. ^[8]; Ravi, V. ^[9]; others, and

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1. CSIRO Astronomy and Space Science, Australia Telescope National Facility, Box 76, Epping, NSW 1710 (Australia)
2. Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE (United Kingdom)
3. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122 (Australia)
4. International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102 (Australia)
5. Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093 (United States)
6. CSIRO Information Management and Technology, Box 225, Dickson, ACT 2602 (Australia)
7. Jodrell Bank Centre for Astrophysics, University of Manchester, M13 9PL (United Kingdom)
8. Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, VIC 3800 (Australia)
9. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, MC 249-17, Pasadena, CA 91125 (United States)

Pulsar timing has enabled some of the strongest tests of fundamental physics. Central to the technique is the assumption that the detected radio pulses can be used to accurately measure the rotation of the pulsar. Here, we report on a broadband variation in the pulse profile of the millisecond pulsar J1643−1224. A new component of emission suddenly appears in the pulse profile, decays over four months, and results in a permanently modified pulse shape. Profile variations such as these may be the origin of timing noise observed in other millisecond pulsars. The sensitivity of pulsar-timing observations to gravitational radiation can be increased by accounting for this variability.

• OSTI ID: 22654235
• Journal Information: Astrophysical Journal Letters, Vol. 828, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCOUNTING
DECAY
DISTURBANCES
EMISSION
GRAVITATIONAL RADIATION
PULSARS
PULSE SHAPERS
PULSES
ROTATION
SENSITIVITY
STARS