A nearby massive galaxy cluster behind the Milky Way
A nearby massive galaxy cluster behind the Milky Way
复制标题
银河系后面附近的一个巨大星系团
作者：
R. Kraan;P. Woudt;V. Cayatte;A. Fairall;C. Balkowski;P. Henning
相对较近的星系的衰退速度显示出与均匀膨胀场的系统性偏差。这些偏差表明“大吸引子”的存在——一个巨大的质量集中（约5 × 1016个太阳质量），位于银河系南部方向1,2。对大吸引子3 - 11的性质和范围进行量化的努力一直受到阻碍，因为它在很大程度上被银河系的圆盘所隐藏。虽然这一地区有过多的星系，但迄今为止还没有发现占优势的星系团或其他质量集中的星系。在这里，我们展示了对被银河系南部遮挡（或部分遮挡）的星系的调查结果。我们的结果表明，先前发现的星系团Abell 3627距离大吸引子预测中心仅9°，质量非常大（约5 x 1015太阳质量）。该星团的红移也接近大吸引子2,3,12 - 14核心的预测值，这表明它位于或接近吸引子引力势阱的底部。
THE recession velocities of relatively nearby galaxies show systematic deviations from a uniform expansion field. These deviations indicate the presence of the 'Great Attractor'—a large concentration of mass (∼5 x 1016solar masses) that lies in the direction of the southern Milky Way1,2. Attempts to quantify both the nature and extent of the Great Attractor3–11have been hampered by the fact that it is largely hidden by the disk of the Milky Way. Although there is an excess of galaxies in this region12, no dominant galaxy cluster or other concentration of mass has hitherto been identified. Here we present results from a survey of galaxies obscured (or partially obscured) by the southern Milky Way. Our results show that a previously identified galaxy cluster, Abell 3627, which lies only 9 ° from the predicted centre of the Great Attractor13, is very massive (∼5 x 1015solar masses). The cluster's redshift is also near that predicted for the core of the Great Attractor2,3,12–14, suggesting that it lies at or near the bottom of the Attractor's gravitational potential well.