论文标题
用潮汐流和脉冲星计时建造加速梯子
Building an Acceleration Ladder with Tidal Streams and Pulsar Timing
论文作者
论文摘要
我们分析了动作角坐标中的恒星流以及最近的局部直接加速测量结果,以提供有关我们银河系潜力的关节限制。我们的流分析使用基于两点相关函数的kullback-leibler差异进行了可能性分析。我们为局部和全球参数提供了脉冲星加速度和恒星流的联合约束,这些参数描述了银河系的潜力(MW)。我们的目标是建立一个``加速梯子'',在该阶梯中,目前在动态范围内的直接加速度测量值与间接技术结合使用,可以访问更大量的MW。以限制MW的潜力,我们会考虑palomar 5,orphan,orphan,nyx,helmi and helmi和gd1 streams sprients prege the Is Prefers prege the Is Prefers a ins prefers the Is the Is the Is the Is the Is at eve of我们曾经是我们的模型。我们还比较了恒星流和脉冲星的垂直加速度,定义了一个函数$ f(z)=α_{1pulsar} z - \ frac {\partialφ} {\partialφ} {\ partial z} $,其中$φ$ a $ a pulsar} z $是从脉冲星的观察结果确定的垂直加速度。
We analyze stellar streams in action-angle coordinates combined with recent local direct acceleration measurements to provide joint constraints on the potential of our Galaxy. Our stream analysis uses the Kullback-Leibler divergence with a likelihood analysis based on the two-point correlation function. We provide joint constraints from pulsar accelerations and stellar streams for local and global parameters that describe the potential of the Milky Way (MW). Our goal is to build an ``acceleration ladder", where direct acceleration measurements that are currently limited in dynamic range are combined with indirect techniques that can access a much larger volume of the MW. To constrain the MW potential with stellar streams, we consider the Palomar 5, Orphan, Nyx, Helmi and GD1 streams. Of the potential models that we have considered here, the preferred potential for the streams is a two-component Staeckel potential. We also compare the vertical accelerations from stellar streams and pulsar timing, defining a function $f(z) = α_{1pulsar}z - \frac{\partialΦ}{\partial z}$, where $Φ$ is the MW potential determined from stellar streams, and $α_{1~\rm pulsar}z$ is the vertical acceleration determined from pulsar timing observations. Our analysis indicates that the Oort limit determined from streams is consistently (regardless of the choice of potential) lower than that determined from pulsar timing observations. The calibration we have derived here may be used to correct the estimate of the acceleration from stellar streams.