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arXiv 1802.08688astro-ph.HEastro-ph.GA
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Abell 3391/Abell 3395星系团间暗条的Chandra和XMM-Newton观测

Chandra and XMM-Newton Observations of the Abell 3391/Abell 3395 Intercluster Filament

Gabriella E. Alvarez, Scott W. Randall, Herve Bourdin, Christine Jones, Kelly Holley-Bockelmann

摘要:

我们提出了钱德拉和XMM-牛顿X射线观测的阿贝尔3391/阿贝尔3395星系团间灯丝。有人认为,星系团Abell 3395、Abell 3391和位于这两个星系团之间的ESO-161星系团,沿着一条大尺度的星系团间暗条排列。我们发现,灯丝对准接近天空的平面,与以前的结果相反。我们发现了一个全局的投射灯丝温度kT = $4.45_{-0.55}^{+0.89}$ ~keV,电子密度$n_e=1.08^{+0.06}_{-0.05} \times 10^{-4}$ ~cm $^{-3}$,和$M_{\rm gas} = 2.7^{+0.2}_{-0.1} \times 10^{13}$ ~M $_\odot$ .暗条的热力学性质与Abell 3395和Abell 3391的团内介质(ICM)一致,表明暗条的发射主要是由ICM气体主导的,ICM气体在这两个团合并的早期阶段被潮汐破坏.我们目前的温度,密度,熵,和丰度分布在整个灯丝。我们发现,星系群ESO-161可能正在经历冲压压力剥离的低密度环境中的维里半径或附近的两个集群,由于其快速运动通过的灯丝。

英文摘要:

We present Chandra and XMM-Newton X-ray observations of the Abell 3391/Abell 3395 intercluster filament. It has been suggested that the galaxy clusters Abell 3395, Abell 3391, and the galaxy group ESO-161 located between the two clusters, are in alignment along a large-scale intercluster filament. We find that the filament is aligned close to the plane of the sky, in contrast to previous results. We find a global projected filament temperature kT = $4.45_{-0.55}^{+0.89}$~keV, electron density $n_e=1.08^{+0.06}_{-0.05} \times 10^{-4}$~cm$^{-3}$, and $M_{\rm gas} = 2.7^{+0.2}_{-0.1} \times 10^{13}$~M$_\odot$. The thermodynamic properties of the filament are consistent with that of intracluster medium (ICM) of Abell 3395 and Abell 3391, suggesting that the filament emission is dominated by ICM gas that has been tidally disrupted during an early stage merger between these two clusters. We present temperature, density, entropy, and abundance profiles across the filament. We find that the galaxy group ESO-161 may be undergoing ram pressure stripping in the low density environment at or near the virial radius of both clusters due to its rapid motion through the filament.

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