The XMM Cluster Outskirts Project (X-COP): Physical conditions of Abell 2142 up to the virial radius
The XMM Cluster Outskirts Project (X-COP): Physical conditions of Abell 2142 up to the virial radius
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XMM 星团外围项目 (X-COP)：Abell 2142 直至维里半径的物理条件
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Rossetti
中科院分区：
文献类型：
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作者：
C. Tchernin;D. Eckert;S. Ettori;E. Pointecouteau;S. Paltani;S. Molendi;G. Hurier;F. Gastaldello;E. Lau;D. Nagai;M. Roncarelli;M. Rossetti
上下文星系团通过其外围物质的吸积不断增长。这一过程会导致气体密度分布的不均匀性（聚集），需要考虑到恢复大半径处的团内介质（ICM）的物理特性。目标。利用Sunyaev Zel'dovich（SZ）效应和X射线信号研究了大质量星系团阿贝尔2142外围（R > R500）的热力学性质。方法.我们将普朗克测量的SZ压力分布与XMM-牛顿气体密度分布相结合，以恢复温度、熵和流体静力质量的径向分布，直到2 × R 500。我们使用了一种对结块不敏感的方法来恢复气体密度，并将结果与传统的X射线测量技术进行了比较。结果当考虑成团时，我们的联合X-SZ熵轮廓与纯引力坍缩的预测是一致的，而当忽略成团的影响时，发现一个显着的熵平坦。使用联合X-SZ数据恢复的流体静力学质量分布与从光谱X射线测量获得的一致，并与通过弱透镜和星系运动学获得的质量重建。结论.我们发现，成团可以解释朱雀在几个星系团外围观察到的熵平坦化。当使用一种对聚集不敏感的方法来重建气体密度时，阿贝尔2142的热力学性质与热气体压力维持引力和熵在吸积激波处注入的假设是相容的，而不需要引起更多的奇异物理。我们的研究结果强调了需要足够的空间分辨率和大的收集面积的X射线观测，以了解在集群外部区域工作的过程。
Context. Galaxy clusters are continuously growing through the accretion of matter in their outskirts. This process induces inhomogeneities in the gas density distribution (clumping) that need to be taken into account to recover the physical properties of the intracluster medium (ICM) at large radii. Aims. We studied the thermodynamic properties in the outskirts ( R > R 500 ) of the massive galaxy cluster Abell 2142 by combining the Sunyaev Zel’dovich (SZ) effect with the X-ray signal. Methods. We combined the SZ pressure profile measured by Planck with the XMM-Newton gas density profile to recover radial profiles of temperature, entropy, and hydrostatic mass out to 2 × R 500 . We used a method that is insensitive to clumping to recover the gas density, and we compared the results with traditional X-ray measurement techniques. Results. When taking clumping into account, our joint X-SZ entropy profile is consistent with the predictions from pure gravitational collapse, whereas a significant entropy flattening is found when the effect of clumping is neglected. The hydrostatic mass profile recovered using joint X-SZ data agrees with that obtained from spectroscopic X-ray measurements and with mass reconstructions obtained through weak lensing and galaxy kinematics. Conclusions. We found that clumping can explain the entropy flattening observed by Suzaku in the outskirts of several clusters. When using a method that is insensitive to clumping for the reconstruction of the gas density, the thermodynamic properties of Abell 2142 are compatible with the assumption that the thermal gas pressure sustains gravity and that the entropy is injected at accretion shocks, with no need to evoke more exotic physics. Our results highlight the need for X-ray observations with sufficient spatial resolution, and large collecting area, to understand the processes at work in cluster outer regions.
利用 Sunyaev-Zeldovich 效应对星系团 Abell 2163 进行多频率成像
影响因子：
6.5
作者：
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簇内介质中气体团簇的性质和气体团簇因子
影响因子：
4.8
作者：
Eckert;Simionescu;Brüggen;Ettori
通讯作者：
Ettori
使用 APEX-SZ 测辐射热计成像数据对簇内气体进行非参数建模
影响因子：
6.5
作者：
通讯作者：
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