arXiv 0905.29382009-05-18astro-ph.CO

附近盘的尘埃性质：M31情况

Dust properties of nearby disks: M31 case

P. L. Nedialkov, A. T. Valcheva, V. D. Ivanov, L. Vanzi

备注：: 7 pages, 3 figures, poster published as an on-line version paper in the Proceedings of IAU Symposium No. 254 "The Galaxy Disk in Cosmological Context" (2009) online, eds. J. Andersen, J. Bland-Hawthorn, and B. Nordstrom (Cambridge University Press)
发表信息：: IAU Symposium No. 254 "The Galaxy Disk in Cosmological Context" (2009), eds. J. Andersen, J. Bland-Hawthorn, and B. Nordstrom (Cambridge University Press)

摘要：

利用光学和近红外测光方法，对透过M31盘观测到的10个球状星团和星系进行了研究。这些物体的个别反射率是相对于几组球状星团和星系的理论光谱能量分布来估计的。七个目标与变红的球状星团一致，两个-星暴星系和一个-椭圆星系。在臂间区，消光系数与半透明盘（Av ~ 1）一致。这些区域的总消光比为2.75，平均低于典型的银河系Rv=3.1。我们还获得了一个气体与尘埃的比率，类似于银河系。它与距M31中心的距离无关。

英文摘要：

Several properties of the M31 disk, namely: opacity, extinction law and gas-to-dust ratio are studied by means of optical and near-infrared photometry of ten globular clusters and galaxies seen through the disk. The individual extinctions of these objects were estimated with respect to several sets of theoretical spectral energy distributions for globulars and galaxies. Seven targets are consistent with reddened globulars, two - with starburst galaxies and one - with an elliptical. The extinction estimates agree with semi-transparent disk (Av ~ 1) in the inter-arm regions. The total-to-selective extinction ratio in those regions 2.75 is lower on average than the typical Galactic value of Rv=3.1. We also obtained a gas-to-dust ratio, similar to that in the the Milky way. It shows no correlation with the distance from the M31 center.

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