090275

Stacking of SZ signals (Y) by stellar mass produces a significant signal which has been used to infer the halo gas mass of galaxies. Interpreting the stacked signal assumes the Y distribution (at fixed M*) is narrow symmetric and for a uniform sample of objects. These conditions are violated when stacking in stellar mass bins so one must understand the distribution of Y as a function of galaxy environment (M* gal/M*tot). This cannot be obtained from the weak individual SZ signals but can be inferred from X-ray observations. We propose to complete our X-ray studies of 15 nearby galaxies that were previously used in a stack of SZ signals. We will measure the distribution of Y _X (X-ray analog of SZ) to quantify the dependence of halo gas mass on galaxy environment. [truncated! Please see actual data for full text]通过按恒星质量对苏尼亚耶夫-泽尔多维奇（Sunyaev-Zel'dovich，SZ）信号（记为Y）进行堆叠，可得到显著信号，该信号曾被用于推断星系的晕气体质量。对该堆叠信号的解读，需预设Y的分布在固定恒星质量（M*）下呈窄对称分布，且样本天体均一。当在恒星质量区间内执行堆叠操作时，上述预设条件将不再成立，因此需要明确Y的分布随星系环境（即单个星系恒星质量与总恒星质量之比M*_gal/M*_tot）的变化关系。这一分布无法从微弱的单个SZ信号中获取，但可通过X射线观测进行推断。我们计划完成对15个邻近星系的X射线研究，这些星系此前曾被用于SZ信号堆叠实验。我们将测量Y_X（SZ信号的X射线对应物理量）的分布，以量化晕气体质量随星系环境的依赖关系。【文本已截断！完整内容请查阅原始数据集】