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arXiv 1102.4754astro-ph.HE
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与Geminga有关的连续射电发射的探测

Detection of continuum radio emission associated with Geminga

A. Pellizzoni, F. Govoni, P. Esposito, M. Murgia, A. Possenti

摘要:

对Geminga脉冲星场的深层甚大阵列观测导致发现,在高于10 sigma的显著性水平上,无线电发射跟踪中子星自行。这个10角秒长的射电特征,在4.8 GHz处以0.4 mJy的通量被探测到,(2.7 \pm 1.8角秒)(无论如何,磁层脉冲发射对观测到的总射电光度的贡献不可能超过15%,约1 E26 erg/s),位置与Chandra最近发现的X射线轴尾一致,并归因于脉冲星风星云(PWN)。总的来说,Geminga无线电尾巴与同步辐射PWN的场景兼容,但目前的数据不允许我们区分不同的(不一定总是相互排斥的)可能的生产过程。如果这种射电特征不是由于Geminga的内在特性,而是由于它的接近性和无线电安静的性质(两者都有助于不阻碍微弱的漫射射电发射),那么其他相对近和高能的无线电安静的恒星可能在专门的干涉观测中显示出类似的结构。

英文摘要:

A deep Very Large Array observation of the Geminga pulsar field led to the discovery, at a higher than 10 sigma significance level, of radio emission trailing the neutron star proper motion. This 10-arcsec-long radio feature, detected with a flux of 0.4 mJy at 4.8 GHz, is marginally displaced (2.7\pm1.8 arcsec) from the pulsar (which, at any rate, is unlikely to contribute with magnetospheric pulsed emission more than 15% to the total observed radio luminosity, about 1E26 erg/s) and positionally coincident with the X-ray axial tail recently discovered by Chandra and ascribed to the pulsar wind nebula (PWN). Overall, the Geminga radio tail is compatible with the scenario of a synchrotron-emitting PWN, but the present data do not allow us to discriminate between different (and not always necessarily mutually exclusive) possible processes for producing that. If this radio feature does not result from intrinsic peculiarities of Geminga, but its proximity and radio-quiet nature (both helping in not hindering the faint diffuse radio emission), other relatively near and energetic radio-quiet pulsars could show similar structures in dedicated interferometric observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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