FERMI-LAT DETECTION OF PULSED GAMMA-RAYS ABOVE 50 GeV FROM THE VELA PULSAR

被引：22
|
作者：
Leung, Gene C. K. [1 ]
Takata, J. [1 ]
Ng, C. W. [1 ]
Kong, A. K. H. [2 ,3 ]
Tam, P. H. T. [2 ,3 ]
Hui, C. Y. [4 ]
Cheng, K. S. [1 ]
机构：
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Natl Tsing Hua Univ, Inst Astron, Hsinchu, Taiwan
[3] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
[4] Chungnam Natl Univ, Dept Astron & Space Sci, Taejon, South Korea
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 797卷 / 02期
关键词：
gamma rays: stars; pulsars: individual (PSR J0835-4510); radiation mechanisms: non-thermal; OUTER GAP MODEL; CRAB PULSAR; EMISSION; ACCELERATION; CATALOG;
D O I：
10.1088/2041-8205/797/2/L13
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The first Fermi-Large Area Telescope (LAT) catalog of sources above 10 GeV reported evidence of pulsed emission above 25 GeV from 12 pulsars, including the Vela pulsar, which showed evidence of pulsation at > 37 GeV energy bands. Using 62 months of Fermi-LAT data, we analyzed the gamma-ray emission from the Vela pulsar and searched for pulsed emission above 50 GeV. Having confirmed the significance of the pulsation in 30-50 GeV with the H test (p-value similar to 10(-77)), we extracted its pulse profile using the Bayesian block algorithm and compared it with the distribution of the five observed photons above 50 GeV using the likelihood ratio test. Pulsation was significantly detected for photons above 50 GeV with a p-value of = 3 x 10(-5) (4.2 sigma). The detection of pulsation is significant above 4 sigma at > 79 GeV and above 3 sigma at > 90 GeV energy bands, making this the highest energy pulsation significantly detected by the LAT. We explore the non-stationary outer gap scenario of the very high-energy emissions from the Vela pulsar.
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页数：5
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