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GAMMA-RAY EMISSION FROM THE VELA PULSAR MODELED WITH THE ANNULAR GAP AND THE CORE GAP
Du, Y. J.1; Han, J. L.1; Qiao, G. J.2; Chou, C. K.1
2011-04-10
Source PublicationASTROPHYSICAL JOURNAL
Volume731Issue:1
AbstractThe Vela pulsar represents a distinct group of gamma-ray pulsars. Fermi gamma-ray observations reveal that it has two sharp peaks (P1 and P2) in the light curve, with a phase separation of 0.42 and a third peak (P3) in the bridge. The location and intensity of P3 are energy dependent. We use the three-dimensional magnetospheric model for the annular and core gaps to simulate the gamma-ray light curves and the phase-averaged and phase-resolved spectra. We found that the acceleration electric field along a field line in the annular gap region decreases with height. Emission at the high-energy GeV band originates from the synchro-curvature radiation (mainly curvature radiation) of accelerated primary particles, while the synchrotron radiation from secondary particles contributes somewhat to the low-energy gamma-ray band (0.1-0.3 GeV). The gamma-ray light curve peaks P1 and P2 are generated in the annular gap region near the altitude of null charge surface, whereas P3 and the bridge emission are generated in the core gap region. The intensity and location of P3 at different energy bands depend on the emission altitudes. The radio emission from the Vela pulsar should be generated in a high-altitude narrow region of the annular gap, which leads to a radio phase lag of similar to 0.13 prior to the first gamma-ray peak.
KeywordGamma Rays: Stars Pulsars: General Pulsars: Individual (Psr J0835-4510) Radiation Mechanisms: Non-thermal
DOI10.1088/0004-637X/731/1/2
Indexed BySCI
Language英语
WOS IDWOS:000289772800002
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8034
Collection射电天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Du, Y. J.,Han, J. L.,Qiao, G. J.,et al. GAMMA-RAY EMISSION FROM THE VELA PULSAR MODELED WITH THE ANNULAR GAP AND THE CORE GAP[J]. ASTROPHYSICAL JOURNAL,2011,731(1).
APA Du, Y. J.,Han, J. L.,Qiao, G. J.,&Chou, C. K..(2011).GAMMA-RAY EMISSION FROM THE VELA PULSAR MODELED WITH THE ANNULAR GAP AND THE CORE GAP.ASTROPHYSICAL JOURNAL,731(1).
MLA Du, Y. J.,et al."GAMMA-RAY EMISSION FROM THE VELA PULSAR MODELED WITH THE ANNULAR GAP AND THE CORE GAP".ASTROPHYSICAL JOURNAL 731.1(2011).
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