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Distances from Stellar Kinematics for Peculiar Virgo Cluster Spiral Galaxies

机译:特殊处女座星团螺旋星系的恒星运动学距离

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摘要

We present distance estimates for 11 peculiar Virgo Cluster spiral galaxies based on measurements of the stellar kinematics of their central 2 kpc. Stellar circular velocities were obtained using two-integral dynamical models. Distances were obtained by comparing, at each radius, the stellar circular velocities with synthetic Hα rotation curves derived from NIR Tully-Fisher relations. The results show that most of our galaxies are located within 4 Mpc of the core of the cluster. Three of these galaxies, previously classified as "low rotator galaxies" or with "truncated/compact" Hα radial distributions, have stellar kinematics-based distances that are discrepant with H I-based distances by at least 60% and are likely to be located within the virial radius of the cluster. These discrepancies appear due to very truncated gas distributions plus noncircular gas motions or gas motions not in the plane of the stellar disk, perhaps as the result of gravitational interactions. Our results show that environmental effects can significantly reduce the measured H I line widths for some disturbed cluster galaxies, thus affecting the accurate determination of distances based on gas kinematics methods.
机译:我们根据中心2 kpc的恒星运动学的测量结果,为11个奇特的处女座星系螺旋星系提供距离估计。使用两个积分动力学模型获得了恒星的圆速度。通过在每个半径处将恒星圆速度与从NIR Tully-Fisher关系得出的合成Hα旋转曲线进行比较,可以得出距离。结果表明,我们的大多数星系位于星团核心的4 Mpc之内。这些星系中的三个星系以前被归类为“低旋转星系”或具有“截断/紧凑”的Hα径向分布,它们基于恒星运动学的距离与基于H I的距离至少相差60%,并且很可能位于在簇的病毒半径内。这些差异的出现是由于气体被截断,加上非圆形气体运动或气体运动不在恒星盘的平面内,这可能是重力相互作用的结果。我们的结果表明,环境影响可以显着减小某些扰动星团星系的H I线宽,从而影响基于气体运动学方法的距离的准确确定。

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