arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.4776astro-ph.HEastro-ph.GA
收藏

船尾座A超新星遗迹中心X射线源的深光学观测

Deep optical observations of the central X-ray source in the Puppis A supernova remnant

R. P. Mignani, A. De Luca, S. Mereghetti, P. A. Caraveo

摘要:

X射线观测揭示了一组位于年轻超新星遗迹(SNRs)中心的无线电静默孤立中子星(INS),被称为中心致密天体或CCO,其性质不同于经典的旋转动力中子星。在至少三种情况下,有证据表明CCO是低磁化的INS,出生时旋转周期缓慢,可能是从超新星事件形成的物质碎片盘中吸积而来。了解CCO多样性的起源可以为超新星爆炸和中子星形成模型提供理论依据。光学/红外(IR)观测对于测试不同的CCO解释至关重要。我们工作的目的是在Puppis A SNR中对CCO RX J0822.0-4300进行深入的光学研究,这是CCO家族中最不了解的一个。我们利用甚大望远镜(VLT)在B、V、I波段进行了以RX J 0822.0 -4300的Chandra X射线坐标为参考的深光学观测。我们发现没有候选人的光学对应物内的计算钱德拉X射线的位置下降到5 σ极限的B~27.2,V~26.9,和I~25.6,最深的光学波段中获得的这个源。这些极限证实了没有探测到比M5矮星更亮的伴星。与此同时,它们并不限制来自中子星表面的光辐射,而来自磁层的辐射则需要在光学/红外光谱中出现光谱中断。

英文摘要:

X-ray observations reveiled a group of radio-silent isolated neutron stars (INSs) at the centre of young supernova remnants (SNRs), dubbed central compact objects or CCOs, with properties different from those of classical rotation-powered pulsars. In at least three cases, evidence points towards CCOs being low-magnetized INSs, born with slow rotation periods, and possibly accreting from a debris disc of material formed out of the supernova event. Understanding the origin of the diversity of the CCOs can shed light on supernova explosion and neutron star formation models. Optical/infrared (IR) observations are crucial to test different CCO interpretations. The aim of our work is to perform a deep optical investigation of the CCO RX J0822.0-4300 in the Puppis A SNR, one of the most poorly understood in the CCO family. By using as a reference the Chandra X-ray coordinates of RX J0822.0-4300, we performed deep optical observations in the B, V and I bands with the Very Large Telescope (VLT). We found no candidate optical counterpart within 3 sigma of the computed Chandra X-ray position down to 5 sigma limits of B~27.2, V~26.9, and I~25.6, the deepest obtained in the optical band for this source. These limits confirm the non-detection of a companion brighter than an M5 dwarf. At the same time, they do not constrain optical emission from the neutron star surface, while emission from the magnetosphere would require a spectral break in the optical/IR.

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。

↑