大规模吸积星系团A2029
The Massively Accreting Cluster A2029
摘要：
我们探索星系团Abell 2029及其周围的结构的基础上，随着X射线和弱透镜观测密集光谱。红移巡天包括4376个星系（1215个光谱星系团成员），距离星系团中心40弧分以内;这里包括了红移。两个子系统，A2033和南部的落入集团（SIG）出现在下降区的基础上的光谱，以及在弱透镜和X射线地图。对A2029的完整的红移测量还确定了A2029场中至少12个前景和背景系统（10个是扩展X射线源）;我们包括了对它们属性的普查。A2029、A2033、SIG和前景/背景系统的X射线光度$L_{X}$ -速度色散（$σ_{cl}$）标度关系与已知的星系团标度关系是一致的。结合光谱学、弱透镜和X射线观测，提供了对A2029、A2033和SIG质量的可靠测量。落星系团（A2033和SIG）的总质量是主星系团A2029的M200的$\sim 60\%$。简单的动力学考虑表明，A2029将在未来几个Gyr吸积这些子系统。与模拟结果和在类似红移范围内观察到的其他星系团一致，A2029的总质量与A2029 M200相当，并且在未来很长一段时间内将主要被吸积。
英文摘要：
We explore the structure of galaxy cluster Abell 2029 and its surroundings based on intensive spectroscopy along with X-ray and weak lensing observations. The redshift survey includes 4376 galaxies (1215 spectroscopic cluster members) within 40 arcmin of the cluster center; the redshifts are included here. Two subsystems, A2033 and a Southern Infalling Group (SIG) appear in the infall region based on the spectroscopy as well as on the weak lensing and X-ray maps. The complete redshift survey of A2029 also identifies at least 12 foreground and background systems (10 are extended X-ray sources) in the A2029 field; we include a census of their properties. The X-ray luminosities $L_{X}$ - velocity dispersions ($σ_{cl}$) scaling relations for A2029, A2033, SIG, and the foreground/background systems are consistent with the known cluster scaling relations. The combined spectroscopy, weak lensing, and X-ray observations provide a robust measure of the masses of A2029, A2033, and SIG. The total mass of the infalling groups (A2033 and SIG) is $\sim 60\%$ of the M200 of the primary cluster, A2029. Simple dynamical consid- erations suggest that A2029 will accrete these subsystems in next few Gyr. In agreement with simulations and with other clusters observed in a similar redshift range, the total mass in the A2029 infall region is comparable with the A2029 M200 and will mostly be accreted in the long-term future.
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