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Title: A New Approach to the GeV Flare of PSR B1259-63/LS2883

Abstract

PSR B1259-63/LS2883 is a binary system composed of a pulsar and a Be star. The Be star has an equatorial circumstellar disk (CD). The Fermi satellite discovered unexpected gamma-ray flares around 30 days after the last two periastron passages. The origin of the flares remains puzzling. In this work, we explore the possibility that the GeV flares are consequences of inverse Compton scattering of soft photons by the pulsar wind. The soft photons are from an accretion disk around the pulsar, which is composed of the matter from the CD captured by the pulsar’s gravity at disk-crossing before the periastron. At the other disk-crossing after the periastron, the density of the CD is not high enough, so accretion is prevented by the pulsar wind shock. This model can reproduce the observed spectrum energy distributions and light curves satisfactorily.

Authors:
;  [1]
  1. Department of Physics, The University of Hong Kong, Pokfulam Road (Hong Kong)
Publication Date:
OSTI Identifier:
22663333
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 844; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; CAPTURE; COMPTON EFFECT; COSMIC GAMMA BURSTS; DENSITY; ENERGY SPECTRA; GAMMA RADIATION; GEV RANGE; GRAVITATION; PHOTONS; PULSARS; SATELLITES; STARS; STELLAR FLARES; STELLAR WINDS; VISIBLE RADIATION

Citation Formats

Yi, Shu-Xu, and Cheng, K. S., E-mail: yishuxu@hku.hk, E-mail: hrspksc@hku.hk. A New Approach to the GeV Flare of PSR B1259-63/LS2883. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7C65.
Yi, Shu-Xu, & Cheng, K. S., E-mail: yishuxu@hku.hk, E-mail: hrspksc@hku.hk. A New Approach to the GeV Flare of PSR B1259-63/LS2883. United States. doi:10.3847/1538-4357/AA7C65.
Yi, Shu-Xu, and Cheng, K. S., E-mail: yishuxu@hku.hk, E-mail: hrspksc@hku.hk. Tue . "A New Approach to the GeV Flare of PSR B1259-63/LS2883". United States. doi:10.3847/1538-4357/AA7C65.
@article{osti_22663333,
title = {A New Approach to the GeV Flare of PSR B1259-63/LS2883},
author = {Yi, Shu-Xu and Cheng, K. S., E-mail: yishuxu@hku.hk, E-mail: hrspksc@hku.hk},
abstractNote = {PSR B1259-63/LS2883 is a binary system composed of a pulsar and a Be star. The Be star has an equatorial circumstellar disk (CD). The Fermi satellite discovered unexpected gamma-ray flares around 30 days after the last two periastron passages. The origin of the flares remains puzzling. In this work, we explore the possibility that the GeV flares are consequences of inverse Compton scattering of soft photons by the pulsar wind. The soft photons are from an accretion disk around the pulsar, which is composed of the matter from the CD captured by the pulsar’s gravity at disk-crossing before the periastron. At the other disk-crossing after the periastron, the density of the CD is not high enough, so accretion is prevented by the pulsar wind shock. This model can reproduce the observed spectrum energy distributions and light curves satisfactorily.},
doi = {10.3847/1538-4357/AA7C65},
journal = {Astrophysical Journal},
number = 2,
volume = 844,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}