The Virgo High-Resolution CO Survey: II. Rotation Curves and Dynamical Mass Distributions
The Virgo High-Resolution CO Survey: II. Rotation Curves and Dynamical Mass Distributions
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Virgo 高分辨率 CO 勘测：II。
DOI：
10.1093/pasj/55.1.59
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发表时间：
2003
影响因子：
2.3
通讯作者：
S. Onodera
中科院分区：
文献类型：
--
作者：
Y. Sofue;J. Koda;H. Nakanishi;S. Onodera
基于使用 Nobeyama 毫米波阵列对室女座螺旋进行的高分辨率 CO 勘测，我们使用速度场确定了动力学中心，并得出了沿星系主轴穿过动力学中心的位置速度图 (PVD)。我们应用了一种新的迭代方法来导出旋转曲线 (RC)，从而再现了观察到的 PVD。获得的高精度 RC 通常在中心 ∼100 至 200pc 区域显示出急剧上升，随后在圆盘中呈现平坦旋转。我们基于质量分布是球形或薄盘形的两个极端假设，应用反卷积方法使用 RC 来计算表面质量密度 (SMD)。两个假设给出几乎相同的结果，在 fac�� 内彼此一致）
Based on a high-resolution CO survey of Virgo spirals with the Nobeyama Millimeter-wave Array, we determined the dynamical centers using velocity fields, and derived position–velocity diagrams (PVDs) along the major axes of the galaxies across their dynamical centers. We applied a new iteration method to derive rotation curves (RCs), which reproduce the observed PVDs. The obtained high-accuracy RCs generally show a steep rise in the central ∼100 to 200pc regions, followed by flat rotation in the disk. We applied a deconvolution method to calculate the surface-mass density (SMD) using the RCs based on two extreme assumptions that the mass distribution is either spherical or thin-disk shaped. Both assumptions give nearly identical results, agreeing with each other within a fac�� )