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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Cepheid distance estimation for Virgo cluster
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Cepheid distance estimation for Virgo cluster

机译：处女座星团的造父距离估计

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摘要

A measurement of distance to the Virgo cluster and a few of its member galaxies by direct method is clearly important for a reliable determination of the Hubble constant as well as for studying the dynamics of a nearby rich galaxy cluster. Cepheid variables in a few galaxies in the Virgo cluster were observed with the Hubble Space Telescope (HST) over the last few years. This work is a reanalysis of the HST data following our study of the Galactic and Magellanic Cloud Cepheids. The log (period) vs V-magnitude relation is re-calibrated using the Galactic, LMC as well as the HST observations. The number density of Cepheid variables as a function of their period is used to determine the role of flux-limited incompleteness and a prescription is given to correct for this bias in the sample. The extinction correction is carried out using period vs mean [V-I](0) colour and V-amplitude vs (V-I) colour at the brightest phase relations. The distance and error estimation is based on L-1 minimization. The mean distance to Virgo cluster is estimated to be 20.5 +/- 1.8 (random)+/- 2.5 (systematic) Mpc.
机译：用直接方法测量到处女座星团及其几个星系的距离，对于可靠地确定哈勃常数以及研究附近的丰富星系星团的动力学显然很重要。在最近几年中，使用哈勃太空望远镜（HST）观测到了处女座星系中几个星系中的造父变星。在我们研究了银河系和麦哲伦星系造父变星之后，这项工作是对HST数据的重新分析。使用银河系，LMC和HST观测值重新校准了对数（周期）与V量级的关系。造父变数作为其周期的函数的数量密度用于确定通量有限的不完整性的作用，并给出了校正样品中这种偏差的处方。在最亮的相位关系下，使用周期对均值[V-1]（0）颜色和V幅值对（V-1）颜色进行消光校正。距离和误差估计基于L-1最小化。到处女座星团的平均距离估计为20.5 +/- 1.8（随机）+/- 2.5（系统）Mpc。

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