A RADIO PULSAR SEARCH OF THE γ-RAY BINARIES LS I+61 303 AND LS 5039

被引：21
作者：
McSwain, M. Virginia [1 ]
Ray, Paul S. [2 ]
Ransom, Scott M. [3 ]
Roberts, Mallory S. E. [4 ]
Dougherty, Sean M. [5 ]
Pooley, Guy G. [6 ]
机构：
[1] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA
[2] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA
[3] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
[4] Eureka Sci Inc, Oakland, CA 94602 USA
[5] Natl Res Council Canada, Herzberg Inst Astrophys, Domin Radio Astrophys Observ, Penticton, BC V2A 6J9, Canada
[6] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
来源：
ASTROPHYSICAL JOURNAL | 2011年 / 738卷 / 01期
关键词：
pulsars: general; stars: individual (LS I+61 303; LS; 5039); X-RAY; MICROQUASAR LS-5039; ORBITAL MODULATION; I +61-DEGREES-303; PSR B1259-63; H-ALPHA; EMISSION; STAR; WIND; I+61-DEGREES-303;
D O I：
10.1088/0004-637X/738/1/105
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
LS I +61 303 and LS 5039 are exceptionally rare examples of high-mass X-ray binaries with MeV-TeV emission, making them two of only five known "gamma-ray binaries." There has been disagreement within the literature over whether these systems are microquasars, with stellar winds accreting onto a compact object to produce high energy emission and relativistic jets, or whether their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. Here we present an attempt to detect radio pulsars in both systems with the Green Bank Telescope. The upper limits of flux density are between 4.1 and 14.5 mu Jy, and we discuss the null results of the search. Our spherically symmetric model of the wind of LS 5039 demonstrates that any pulsar emission will be strongly absorbed by the dense wind unless there is an evacuated region formed by a relativistic colliding wind shock. LS I +61 303 contains a rapidly rotating Be star whose wind is concentrated near the stellar equator. As long as the pulsar is not eclipsed by the circumstellar disk or viewed through the densest wind regions, detecting pulsed emission may be possible during part of the orbit.
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页数：6
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