银河系外天体的观测和低加速度下的重力定量检验
Outer Galactic Disks and a Quantitative Test of Gravity at Low Accelerations
摘要：
我们使用最近的恒星形成，外盘结的速度色散的测量Herbert-Fort等人。在近面对面的星系NGC 628，结合其他数据从文献中，执行一个简单的测试重力在低加速度。具体而言，大半径处的旋转曲线设置非标准加速度的程度，然后预测该半径处的结的scaleheight提供对场景的测试。对于我们的演示，我们假设年轻（年龄<1000万年）的H α结像它们最近形成的气体一样分布，并发现与当前数据的修改重力情景存在边际差异（> 97%置信度）。更有趣的是，我们证明，有没有内在的限制，阻止这样的测试达到可能的歧视在> 4西格玛水平与合理的投资观测资源。
英文摘要：
We use the recent measurement of the velocity dispersion of star-forming, outer-disk knots by Herbert-Fort et al. in the nearly face-on galaxy NGC 628, in combination with other data from the literature, to execute a straightforward test of gravity at low accelerations. Specifically, the rotation curve at large radius sets the degree of non-standard acceleration and then the predicted scaleheight of the knots at that radius provides the test of the scenario. For our demonstration, we presume that the H alpha knots, which are young (age < 10 Myr), are distributed like the gas from which they have recently formed and find a marginal (> 97% confidence) discrepancy with a modified gravity scenario given the current data. More interestingly, we demonstrate that there is no inherent limitation that prevents such a test from reaching possible discrimination at the > 4 sigma level with a reasonable investment of observational resources.
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