PSR J2021+3651:: A young radio pulsar coincident with an unidentified EGRET γ-ray source

被引:69
作者
Roberts, MSE
Hessels, JWT
Ransom, SM
Kaspi, VM
Freire, PCC
Crawford, F
Lorimer, DR
机构
[1] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[2] Natl Astron & Ionosphere Ctr, Arecibo Observ, Arecibo, PR 00612 USA
[3] Haverford Coll, Dept Phys & Astron, Haverford, PA 19041 USA
[4] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词
gamma rays : observations; pulsars : general; pulsars : individual (PSR J2021+3651); stars : neutron; X-rays : individual (AX J2021.1+3651);
D O I
10.1086/344082
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on a deep search for radio pulsations toward five unidentified ASCA X-ray sources coincident with EGRET gamma-ray sources. This search has led to the discovery of a young and energetic pulsar using data obtained with the new Wideband Arecibo Pulsar Processor. PSR J2021+3651 is likely associated with the X-ray source AX J2021.1+3651, which in turn is likely associated with the COS B high-energy gamma-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716. PSR J2021+3651 has a rotation period of P similar to 104 ms and (P) over dot similar to 9.6 x 10(-14), implying a characteristic age of tau(c) similar to 17 kyr and a spin-down luminosity of (E) over dot similar to 3.4 x 10(36) ergs s(-1). The dispersion measure DM similar to pc cm(-3) is by far the highest of any observed pulsar in the Galactic longitude range 55degrees <l<80degrees. This DM suggests a distance dgreater than or similar to 10 kpc and a high gamma-ray efficiency of similar to15%, but the true distance may be closer if there is a significant contribution to the DM from excess gas in the Cygnus region. The implied luminosity of the associated X-ray source suggests the X-ray emission is dominated by a pulsar wind nebula unresolved by ASCA.
引用
收藏
页码:L19 / L22
页数:4
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