标题： 对 coma 星系团中的太阳泽尔多维奇效应的毫米/亚毫米波段搜索 显示英文标题

标题： A Millimeter/Submillimeter Search for the Sunyaev-Zel'dovich Effect in the Coma Cluster

摘要： 分析了中尺度各向异性测量（MSAM1-92）首次飞行任务的观测数据，以搜寻通向后发座星系团的萨列赫-泽尔多维奇（SZ）效应。这一搭载于气球上的仪器使用一个$28\arcmin$全宽半高高斯波束和一个振幅为$\pm40\arcmin$的三位置摆动模式。该仪器在 5.7、9.3、16.5 和 22.6~\icm GHz 频道进行观测，同时采样了强度从减少到增加的 SZ 谱畸变范围，并且该范围内的强度变化分数显著高于雷利-金斯区域。我们对我们的天线图形积分得到的康普顿化参数设定了限制，$\Delta y \leq 8.0 \times 10^{-5}$($2 \sigma$)。 对于球对称的等温模型，这意味着中心康普顿化参数 $y_o \leq 2.0 \times 10^{-4}$，或者中心电子密度 $n_o \leq 5.8 \times10^{-3}$厘米 $^{-3}h_{50}$，这一结果与通过 X 射线亮度测量和 SZ 效应低频观测得出的中心密度一致。 显示英文摘要

摘要： Observations from the first flight of the Medium Scale Anisotropy Measurement (MSAM1-92) are analyzed to search for the Sunyaev-Zel'dovich (SZ) effect towards the Coma cluster. This balloon-borne instrument uses a $28\arcmin$ FWHM beam and a three position chopping pattern with a throw of $\pm40\arcmin$. With spectral channels at 5.7, 9.3, 16.5, and 22.6~\icm, the observations simultaneously sample the frequency range where the SZ spectral distortion in the intensity transitions from a decrement to an increment and where the fractional intensity change is substantially larger than in the Rayleigh-Jeans region. We set limits on the Comptonization parameter integrated over our antenna pattern, $\Delta y \leq 8.0 \times 10^{-5}$($2 \sigma$). For a spherically symmetric isothermal model, this implies a central Comptonization parameter, $y_o \leq 2.0 \times 10^{-4}$, or a central electron density, $n_o \leq 5.8 \times10^{-3}$cm$^{-3}h_{50}$, a result consistent with central densities implied by X-ray brightness measurements and central Comptonization estimates from lower frequency observations of the SZ effect.