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arXiv 2303.12686astro-ph.HE
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SRG/eROSITA与XMM-Newton对Vela Jr的观测

SRG/eROSITA and XMM-Newton observations of Vela Jr

Francesco Camilloni, Werner Becker, Peter Predehl, Konrad Dennerl, Michael Freyberg, Martin G. F. Mayer, Manami Sasaki

AI总结:

本研究利用SRG/eROSITA的完整观测数据及XMM-Newton存档数据,分析Vela Jr超新星遗迹的辐射特征、磁场分布、光谱性质及中心致密天体位置,验证了其与光学/红外对应体的关联,为激波加速研究提供支撑。

摘要:

船帆座超新星遗迹复合体是一个至少包含三个超新星遗迹的区域:Vela、Puppis A和Vela Jr。随着搭载于Spectrum Roentgen Gamma(SRG)任务上的光谱成像X射线望远镜eROSITA的发射,对宽度达1度的Vela Jr进行完整观测成为可能。尽管此前已有数次Chandra和XMM-Newton的定向观测可用,但这是继ROSAT全天巡天之后,第二次以均匀的灵敏度在X射线波段对整个遗迹进行观测。Vela Jr是少数几个在TeV波段有辐射的遗迹之一,使其成为激波加速研究中的重要天体。然而,由于同一视线方向上存在Vela超新星遗迹(SNR),利用X射线辐射确定其年龄和距离的工作受到了极大阻碍。借助eROSITA数据集,我们的目标是表征Vela Jr的辐射并将其与Vela的辐射区分开,同时表征遗迹内部的光谱辐射特征。我们对eROSITA数据进行了处理,将整个遗迹划分为七个不同的区域。此外,我们利用整个遗迹的图像确定了几何中心的位置,并约束了中心致密天体(CCO)的自行运动。我们还利用XMM-Newton对西北(NW)边缘的存档定向观测数据,测定了电子的截止能量和膨胀速度。我们发现西北边缘的磁场可在2μG到16μG之间变化。我们还发现,遗迹光谱在大多数区域均无明显特征,仅在两个内部区域中,添加额外的热模型分量能改善拟合效果。我们得到了遗迹几何中心的新坐标,其与CCO位置的间距仅为35.2±15.8角秒。由此,我们进一步支持了CCO与一个此前提出的暗淡光学/红外对应体之间的关联。

英文摘要:

The Vela supernova remnant complex is a region containing at least three supernova remnants: Vela, Puppis A, and Vela Jr. With the launch of the spectro-imaging X-ray telescope eROSITA on board the Spectrum Roentgen Gamma (SRG) mission, it became possible to observe the one degree wide Vela Jr in its entirety. Although several previous pointed Chandra and XMM-Newton observations are available, it is only the second time after the ROSAT all-sky survey that the whole remnant was observed in X-rays with homogeneous sensitivity. Vela Jr is one of the few remnants emitting in the TeV band, making it an important object in shock acceleration studies. However, the age and distance determination using X-ray emission is largely hampered by the presence of the Vela SNR along the same line. With the eROSITA data set our aim is to characterize the emission of Vela Jr and distinguish it from Vela emission, and also to characterize the spectral emission of the inner remnant. We processed the eROSITA data dividing the whole remnant into seven different regions. In addition, images of the whole remnant were employed to pinpoint the position of the geometric center and constrain the proper motion of the CCO. We also employed archival XMM-Newton pointed observations of the NW rim to determine the cutoff energy of the electrons and the expansion velocity. We find the magnetic field can vary between 2 $μ$G and 16 $μ$G in the NW rim. We also find that the remnant spectrum is uniformly featureless in most regions, except for two inner regions where an extra thermal model component improves the fit. We obtain new coordinates for the geometric remnant center, resulting in a separation of only 35.2 $\pm$ 15.8" from the position of the CCO. As a result, we reinforce the association between the CCO and a proposed faint optical/IR counterpart.

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