GAMMA-RAY EMISSION FROM THE VELA PULSAR MODELED WITH THE ANNULAR GAP AND THE CORE GAP

	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
刊名	ASTROPHYSICAL JOURNAL
	2011-04-10
卷号	731 期号:1
关键词	gamma rays: stars pulsars: general pulsars: individual (PSR J0835-4510) radiation mechanisms: non-thermal
英文摘要	The 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000289772800002
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8034]
专题	国家天文台_射电天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Peking Univ, Sch Phys, Beijing 100871, Peoples R China
推荐引用方式 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).