论文标题
附近星系集群Abell 2199的郊区热力学和金属丰度的高覆盖范围
A high coverage view of the thermodynamics and metal abundance in the outskirts of the nearby galaxy cluster Abell 2199
论文作者
论文摘要
我们提出了附近星系集群Abell 2199郊区的苏扎库和XMM-Newton联合分析，这是附近唯一可以与Suzaku几乎完整的Azimuthal覆盖范围观察到的附近星系集群。使用XMM-Newton的观测来纠正气体结块的影响，我们发现郊区的方位角平均熵剖面遵循了一项功率法，其坡度为$ 1.20 \ pm 0.23 $，统计上与非辐射模拟的坡度为1.1，该斜率与非辐射模拟的1.1一致。但是，当分为10个扇区时，熵显示出显着的方位角变化，一些部门位于基线水平以下。发现方位平均的气体质量分数与宇宙平均巴属分数一致。郊区的金属丰度被发现与在各个方向均匀的均匀相一致，并且其平均值为0.29 _ { - 0.03}^{+0.03} \，z _ {\ odot} $，与将燃气收集到含量上的捕获物相一致。
We present a joint Suzaku and XMM-Newton analysis of the outskirts of the nearby galaxy cluster Abell 2199, the only nearby galaxy cluster to be observed with near complete azimuthal coverage with Suzaku. Using the XMM-Newton observations to correct for the effects of gas clumping, we find that the azimuthally averaged entropy profile in the outskirts follows a power law with a slope of $1.20 \pm 0.23$, statistically consistent with a slope of 1.1 predicted by non-radiative simulations for purely gravitational hierarchical structure formation. However, when divided into 10 sectors, the entropy shows significant azimuthal variation, with some sectors lying below the baseline level. The azimuthally averaged gas mass fraction is found to agree with the cosmic mean baryon fraction. The metal abundance in the outskirts is found to be consistent with being uniform in all directions and it has an average value of $0.29_{-0.03}^{+0.03}\,Z_{\odot}$, consistent with the gas accreting onto clusters being pre-enriched with metals.
