在局域宇宙中映射质量
Mapping Mass in the Local Universe
摘要：
我们只能看到宇宙中物质的一小部分，但其余的都因其引力的影响而暴露出来。奇异速度有可能成为追踪这一问题的强大工具，但由于个别测量的大误差，统计数据不佳和天空覆盖不均匀，以前的奇异速度调查一直在努力满足其潜力。2 MASS Tully-Fisher（2 MTF）巡天将利用现有的高质量旋转宽度、新的HI宽度和2 MASS（2微米全天空巡天）测光来测量2 MASS红移巡天（2 MRS）中所有明亮倾斜螺旋的Tully-Fisher距离/特殊速度。这项基于2 MASS星系目录的调查将提供一个质量更好的样本。它将在天空覆盖方面提供显着的改善，特别是在我们的银河系平面附近，该平面穿过知之甚少的“大吸引子”区域。我将给出2 MTF调查的进展报告，包括绿岸望远镜（GBT）300多小时的HI观测，以及帕克射电望远镜正在进行的南半球观测报告。新的螺旋I波段场（SFI++）样本是目前在局部宇宙中使用的最好的可用特殊速度调查。我还将报告从这个样本中获得的一些初步结果。
英文摘要：
We only see a small fraction of the matter in the universe, but the rest gives itself away by the impact of its gravity. Peculiar velocities have the potential to be a powerful tool to trace this matter however previous peculiar velocity surveys have struggled to meet their potential because of the large errors on individual measurements, poor statistics and uneven sky coverage. The 2MASS Tully-Fisher (2MTF) survey will make use of existing high quality rotations widths, new HI widths and 2MASS (2 Micron All-Sky Survey) photometry to measure Tully-Fisher distances/peculiar velocities for all bright inclined spirals in the 2MASS redshift survey (2MRS). This survey based on the 2MASS galaxy catalog will provide a qualitatively better sample. It will provide significant improvements in sky coverage especially near the plane of our Galaxy which crosses the poorly understood "great attractor" region. I will give a progress report on the 2MTF survey including a look at over 300 hours of HI observations from the Green Bank Telescope (GBT) and a report on ongoing southern hemisphere observations with the Parke s Radio Telescope. The new spiral I-band field (SFI++) sample is currently the best available peculiar velocity survey for use in the local universe. I will also report on some preliminary results from this sample.
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