标题： 星系团质量成分上的变色龙第五力的形状 显示英文标题

标题： The shape of the Chameleon fifth-force on the mass components of galaxy clusters

摘要： 在变色龙引力的背景下，我们给出了星系团质量成分（即最亮星系团星系（BCG）的恒星质量、星系中的重子质量（不包括BCG）、星系团内介质（ICM）的质量以及弥散冷暗物质（CDM）的质量）中变色龙场轮廓的一个半解析解。所得的半解析轮廓通过了变色龙场方程的数值解的验证，并被实现到\textsc{MG-MAMPOSSt}代码中，用于修改引力场景下星系团的动力学分析。 通过模拟的示假晕（mock halos），分别在广义相对论（GR）和修改引力中进行模拟，我们展示了星系团成员星系的速度和位置组合，连同BCG的恒星速度弥散轮廓数据，可以对变色龙模型的参数空间施加限制；对于在GR中生成的星系团，这些限制与使用单一质量剖面建模的星系团的联合透镜+动力学分析相当，且无需使用BCG数据。 显示英文摘要

摘要： In the context of Chameleon gravity, we present a semi-analytical solution of the chameleon field profile in accurately modelled galaxy cluster's mass components, namely: the stellar mass of the Brightest Cluster Galaxy (BCG), the baryonic mass in galaxies (other than the BCG), the mass of the Intra-Cluster Medium (ICM) and the diffuse cold dark matter (CDM). The obtained semi-analytic profile is validated against the numerical solution of the chameleon field equation and implemented in the \textsc{MG-MAMPOSSt} code for kinematic analyses of galaxy clusters in modified gravity scenarios. By means of mock halos, simulated both in GR and in modified gravity, we show that the combination of velocities and positions of cluster member galaxies, along with data of the stellar velocity dispersion profile of the BCG, can impose constraints on the parameter space of the Chameleon model; for a cluster generated in GR, these constraints are at the same level as a joint lensing+kinematics analysis of a cluster modelled with a single mass profile, without the BCG data.