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arXiv 2004.10032astro-ph.HE
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HD ~ 93129 A近星点的高能辐射

The high-energy emission from HD~93129A near periastron

S. del Palacio, F. García, D. Altamirano, R. H. Barbá, V. Bosch-Ramon, M. Corcoran, M. De Becker, K. Hamaguchi, J. Maíz Apellániz, P. Munar Adrover, J. M. Pared… 展开作者

S. del Palacio, F. García, D. Altamirano, R. H. Barbá, V. Bosch-Ramon, M. Corcoran, M. De Becker, K. Hamaguchi, J. Maíz Apellániz, P. Munar Adrover, J. M. Paredes, G. E. Romero, H. Sana, M. Tavani, A. ud-Doula

摘要:

我们对银河系中最大和最明亮的碰撞风双星之一HD~ 93129 A进行了一次观测活动,接近2018年的近星点通道。在这段时间内,预计该源将处于最大的高能发射。在这里,我们提出了我们的数据分析从X射线卫星\textit{Chandra}和\textit{NuSTAR}和$γ$射线卫星\textit{AGILE}。在$\sim$ 18 keV的X射线波段探测到与HD~ 93129 A一致的高能发射,而在$γ$射线波段只得到上限。我们解释推导出的通量使用非热辐射模型的风碰撞区域。我们建立了一个保守的上限的分数风动能转换成相对论电子加速度,$f_\mathrm{NT,e} < 0.02$。此外,我们还将风碰撞区的磁场下限设为$B_\mathrm{WCR} > 0.3$ ~G。我们还讨论了一个假定的解释,我们估计$f_\mathrm{NT,e} \approx 0.006$和$B_\mathrm{WCR} \approx 0.5$ ~G的排放。我们的结论是,多波长,专门的观测活动,在精心挑选的时代是一个强大的工具,为特征的相对论粒子的内容和磁场强度碰撞风双星。

英文摘要:

We conducted an observational campaign towards one of the most massive and luminous colliding wind binaries in the Galaxy, HD~93129A, close to its periastron passage in 2018. During this time the source was predicted to be in its maximum of high-energy emission. Here we present our data analysis from the X-ray satellites \textit{Chandra} and \textit{NuSTAR} and the $γ$-ray satellite \textit{AGILE}. High-energy emission coincident with HD~93129A was detected in the X-ray band up to $\sim$18~keV, whereas in the $γ$-ray band only upper limits were obtained. We interpret the derived fluxes using a non-thermal radiative model for the wind-collision region. We establish a conservative upper limit for the fraction of the wind kinetic power that is converted into relativistic electron acceleration, $f_\mathrm{NT,e} < 0.02$. In addition, we set a lower limit for the magnetic field in the wind-collision region as $B_\mathrm{WCR} > 0.3$~G. We also argue a putative interpretation of the emission from which we estimate $f_\mathrm{NT,e} \approx 0.006$ and $B_\mathrm{WCR} \approx 0.5$~G. We conclude that multi-wavelength, dedicated observing campaigns during carefully selected epochs are a powerful tool for characterising the relativistic particle content and magnetic field intensity in colliding wind binaries.

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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