Multi-wavelength Emissions from the Millisecond Pulsar Binary PSR J1023+0038 during an Accretion Active State
Abstract
Recent observations strongly suggest that the millisecond pulsar binary PSR J1023+0038 has developed an accretion disk since 2013 June. We present a multi-wavelength analysis of PSR J1023+0038, which reveals that (1) its gamma-rays suddenly brightened within a few days in 2013 June/July and has remained at a high gamma-ray state for several months; (2) both UV and X-ray fluxes have increased by roughly an order of magnitude; and (3) the spectral energy distribution has changed significantly after the gamma-ray sudden flux change. Time variabilities associated with UV and X-rays are on the order of 100-500 s and 50-100 s, respectively. Our model suggests that a newly formed accretion disk, due to the sudden increase of the stellar wind, could explain the changes of all these observed features. The increase of UV is emitted from the disk, and a new component in gamma-rays is produced by inverse Compton scattering between the new UV component and pulsar wind. The increase of X-rays results from the enhancement of injection pulsar wind energy into the intra-binary shock due to the increase of the stellar wind. We also predict that the radio pulses may be blocked by the evaporated winds from the disk, and the pulsar is still powered by rotation.
Additional Information
© 2014 American Astronomical Society. Received 2013 November 30; accepted 2014 March 1; published 2014 April 3. J.T. and K.S.C. are supported by a GRF grant from the HK Government under HKU7009 11P. A.K.H.K. is supported by the National Science Council of the Republic of China (Taiwan) through grants NSC100-2628-M-007-002-MY3, NSC100-2923-M-007-001-MY3, and NSC101-2119-M-008-007-MY3. P.H.T. is supported by the National Science Council of the Republic of China (Taiwan) through grant NSC101-2112-M-007-022-MY3. C.Y.H. is supported by the National Research Foundation of Korea through grant 2011-0023383.Attached Files
Published - 0004-637X_785_2_131.pdf
Submitted - 1312.0605v2.pdf
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Additional details
- Eprint ID
- 46313
- Resolver ID
- CaltechAUTHORS:20140617-153131163
- HKU7009 11P
- General Research Fund (Hong Kong)
- NSC100-2628-M-007-002-MY3
- National Science Council (Taipei)
- NSC100-2923-M-007-001-MY3
- National Science Council (Taipei)
- NSC101-2119-M-008-007-MY3
- National Science Council (Taipei)
- NSC101-2112-M-007-022-MY3
- National Science Council (Taipei)
- 2011-0023383
- National Research Foundation of Korea
- Created
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2014-06-17Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field