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arXiv 1806.04062astro-ph.HEastro-ph.SRhep-ph
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在超新星1987 A残骸中寻找射电脉冲星

Search for a Radio Pulsar in the Remnant of Supernova 1987A

S. -B. Zhang, S. Dai, G. Hobbs, L. Staveley-Smith, R. N. Manchester, C. J. Russell, G. Zanardo, X. -F. Wu

摘要:

我们用Parkes 64 m射电望远镜对位于大麦云(LMC)中的超新星SN~ 1987 A(SNR~ 1987 A)遗迹进行了观测,寻找周期性和/或瞬态射电辐射。我们在周期性搜索中没有发现射电脉冲星的证据,并导出了1.4GHz的$31\,μ$ Jy和3GHz的$21\,μ$ Jy的8个$σ$上界。检测到4个候选瞬时事件,其显著性大于$7σ$,离散度测量值(DM)在150至840 cm $^{-3}\,$ pc范围内。对于其中两个,我们发现第二个脉冲的意义略低。然而,我们目前还不能得出结论,其中任何一个都与SNR~ 1987 A的脉冲星有关。作为对该系统的检验,我们还观测了PSR~ B 0540 $-$ 69,一颗同样位于大麦哲伦星系的年轻脉冲星。我们在这颗脉冲星的DM处发现了八个巨大的脉冲。我们讨论了这些结果对超新星遗迹,中子星形成和脉冲星演化模型的影响。

英文摘要:

We have observed the remnant of supernova SN~1987A (SNR~1987A), located in the Large Magellanic Cloud (LMC), to search for periodic and/or transient radio emission with the Parkes 64\,m-diameter radio telescope. We found no evidence of a radio pulsar in our periodicity search and derived 8$σ$ upper bounds on the flux density of any such source of $31\,μ$Jy at 1.4~GHz and $21\,μ$Jy at 3~GHz. Four candidate transient events were detected with greater than $7σ$ significance, with dispersion measures (DMs) in the range 150 to 840\,cm$^{-3}\,$pc. For two of them, we found a second pulse at slightly lower significance. However, we cannot at present conclude that any of these are associated with a pulsar in SNR~1987A. As a check on the system, we also observed PSR~B0540$-$69, a young pulsar which also lies in the LMC. We found eight giant pulses at the DM of this pulsar. We discuss the implications of these results for models of the supernova remnant, neutron star formation and pulsar evolution.

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