NEW ESTIMATES OF THE INCLINATION, POSITION ANGLE, PITCH ANGLE, AND SCALE HEIGHT OF THE WHIRLPOOL GALAXY
NEW ESTIMATES OF THE INCLINATION, POSITION ANGLE, PITCH ANGLE, AND SCALE HEIGHT OF THE WHIRLPOOL GALAXY
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DOI：
10.1088/2041-8205/762/2/l27
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
T. Hu;Z. Shao;Q. Peng
中科院分区：
文献类型：
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作者：
T. Hu;Z. Shao;Q. Peng
漩涡星系（M51）的倾角（i）和位置角（PA）对于建模和解释观测至关重要。在这里，我们通过将对数螺旋拟合到主臂来改进这些参数的估计。从对每个主臂的单独拟合，我们得到i = 20.0 ± 2.0 °8和PA = 12.0 ± 2.0 °5。然后，我们使用泊松方程的对数扰动的密度估计的平均垂直刻度高度（H）的M51为95-178 pc。
The inclination (i) and position angle (PA) of the Whirlpool galaxy (M51) are critical to modeling and interpreting observations. Here we make improved estimates of these parameters by fitting logarithmic spirals to the main arms. From separate fits to each major arm, we obtain i = 20.°3 ± 2.°8 and PA = 12.°0 ± 2.°5. We then use Poisson's equation for the logarithmic perturbation of the density to estimate the mean vertical scale height (H) of M51 to be 95–178 pc.