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arXiv 1408.0281astro-ph.HEastro-ph.GA
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为什么PSR J0218 +4232的距离不会挑战脉冲星发射理论

Why the distance of PSR J0218+4232 does not challenge pulsar emission theories

J. P. W. Verbiest, D. R. Lorimer

摘要:

最近由Du等人对毫秒脉冲星J 0218 +4232的天体测量参数的VLBI测量表明,这颗脉冲星的距离为6.3kpc。在如此大的距离上,从这颗脉冲星观测到的大γ射线通量将使其成为已知最明亮的γ射线脉冲星。这种亮度将超过可以解释的外隙和缝隙脉冲星发射模型,潜在地把重要的和其他难以捉摸的限制脉冲星的发射机制。我们表明,VLBI视差测量是由Lutz-Kelker偏差占主导地位。当这个偏差被修正后,这颗脉冲星最有可能的距离是3.15(+0.85/-0.60)kpc。这个修正后的距离将PSR J 0218 +4232的光度置于一个不会挑战任何脉冲星发射机制标准理论的范围内。

英文摘要:

Recent VLBI measurements of the astrometric parameters of the millisecond pulsar J0218+4232 by Du et al. have suggested this pulsar is as distant as 6.3 kpc. At such a large distance, the large γ-ray flux observed from this pulsar would make it the most luminous γ-ray pulsar known. This luminosity would exceed what can be explained by the outer gap and slot-gap pulsar emission models, potentially placing important and otherwise elusive constraints on the pulsar emission mechanism. We show that the VLBI parallax measurement is dominated by the Lutz-Kelker bias. When this bias is corrected for, the most likely distance for this pulsar is 3.15(+0.85/-0.60) kpc. This revised distance places the luminosity of PSR J0218+4232 into a range where it does not challenge any of the standard theories of the pulsar emission mechanism.

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