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arXiv 2103.06317astro-ph.HE
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红背脉冲星PSR J1048 +2339双星内激波辐射的证据

Evidence of intra-binary shock emission from the redback pulsar PSR J1048+2339

A. Miraval Zanon, P. D'Avanzo, A. Ridolfi, F. Coti Zelati, S. Campana, C. Tiburzi, D. de Martino, T. Muñoz Darias, C. G. Bassa, L. Zampieri, A. Possenti, F. Amb… 展开作者

A. Miraval Zanon, P. D'Avanzo, A. Ridolfi, F. Coti Zelati, S. Campana, C. Tiburzi, D. de Martino, T. Muñoz Darias, C. G. Bassa, L. Zampieri, A. Possenti, F. Ambrosino, A. Papitto, M. C. Baglio, M. Burgay, A. Burtovoi, D. Michilli, P. Ochner, P. Zucca

摘要:

我们提出的4.66毫秒红背脉冲星PSR J1048+2339的同时多波长观测。我们用甚大望远镜(VLT)进行了相位分辨光谱学研究,寻找残余吸积盘或双星内激波发射的特征,限制伴星径向速度半振幅($K_2$),并估计中子星质量($M_{\rm NS}$)。使用FORS 2-VLT中分辨率光谱,我们测量了一个伴星的速度$291 < K_2 < 348$ km s $^{-1}$和一个二进制的质量比$0.209 < q < 0.250$。结合我们对$K_2$和$q$的结果,我们将中子星和伴星的质量分别约束为$(1.0 < M_{\rm NS} < 1.6){\rm sin}^{-3}i\,M_{\odot}$和$(0.24 < M_2 < 0.33){\rm sin}^{-3}i\,M_{\odot}$,其中$i$是系统倾角。H $α$发射线的多普勒图在伴星的预期位置处显示出一个斑点特征,在靠近内拉格朗日点处显示出一个扩展的亮点。我们解释这种扩展的发射作为脉冲星相对论风和离开伴星的物质之间的相互作用产生的二元内冲击的效果。第二颗恒星的质量损失可能是由于罗氏瓣溢出或其外层被高能脉冲星风烧蚀。相反,我们没有发现吸积盘的证据。我们报告的结果SRT和LOFAR同时无线电观测在三个不同的频率(150 MHz,336 MHz,和1400 MHz)。在我们的搜索中没有发现脉冲无线电信号。这可能是由于闪烁和从系统中排出的物质的存在,这可能导致低频无线电信号的吸收。最后,我们报告试图寻找光学脉动使用IFI+Iqueye安装在1.2米伽利略望远镜在Asiago天文台。

英文摘要:

We present simultaneous multiwavelength observations of the 4.66 ms redback pulsar PSR J1048+2339. We performed phase-resolved spectroscopy with the Very Large Telescope (VLT) searching for signatures of a residual accretion disk or intra-binary shock emission, constraining the companion radial velocity semi-amplitude ($K_2$), and estimating the neutron star mass ($M_{\rm NS}$). Using the FORS2-VLT intermediate-resolution spectra, we measured a companion velocity of $291 < K_2 < 348$ km s$^{-1}$ and a binary mass ratio of $0.209 < q < 0.250$. Combining our results for $K_2$ and $q$, we constrained the mass of the neutron star and the companion to $(1.0 < M_{\rm NS} < 1.6){\rm sin}^{-3}i\,M_{\odot}$ and $(0.24 < M_2 < 0.33){\rm sin}^{-3}i\,M_{\odot}$, respectively, where $i$ is the system inclination. The Doppler map of the H$α$ emission line exhibits a spot feature at the expected position of the companion star and an extended bright spot close to the inner Lagrangian point. We interpret this extended emission as the effect of an intra-binary shock originating from the interaction between the pulsar relativistic wind and the matter leaving the companion star. The mass loss from the secondary star could be either due to Roche-lobe overflow or to the ablation of its outer layer by the energetic pulsar wind. Contrastingly, we find no evidence for an accretion disk. We report on the results of the SRT and the LOFAR simultaneous radio observations at three different frequencies (150 MHz, 336 MHz, and 1400 MHz). No pulsed radio signal is found in our search. This is probably due to both scintillation and the presence of material expelled from the system which can cause the absorption of the radio signal at low frequencies. Finally, we report on an attempt to search for optical pulsations using IFI+Iqueye mounted at the 1.2 m Galileo telescope at the Asiago Observatory.

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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