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arXiv 0810.4773astro-ph
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用Tully-Fisher B关系再论旋涡星系的光学厚度

Revisiting the optical depth of spiral galaxies using the Tully-Fisher B relation

E. Kankare, M. Hanski, G. Theureau, P. Teerikorpi

摘要:

目标。我们试图通过对正在进行的KLUN+调查的新Tully-Fisher数据的统计研究来确定螺旋星系盘的光学深度,并澄清光学深度的真实和表观行为之间的差异。方法.通过利用所谓的归一化距离,数据的子样本被识别为尽可能不受选择效应的影响。对于这些星系,一组表观数量计算的脸上的位置使用塔利-费舍尔直径和星等关系。将这些值与直接观测值进行比较,以确定描述光学深度的参数C的平均值。结果目前的研究表明,螺旋星系盘是相对光学薄的tauB = 0.1,至少在最外面的区域,而它们一般出现在光学厚tauB > 1时,视星等和平均表面亮度的统计研究。

英文摘要:

Aims. We attempt to determine the optical depth of spiral galaxy disks by a statistical study of new Tully-Fisher data from the ongoing KLUN+ survey, and to clarify the difference between the true and apparent behavior of optical depth. Methods. By utilizing so-called normalized distances, a subsample of the data is identified to be as free from selection effects as possible. For these galaxies, a set of apparent quantities are calculated for face-on positions using the Tully-Fisher diameter and magnitude relations. These values are compared with direct observations to determine the mean value of the parameter C describing the optical depth. Results. The present study suggests that spiral galaxy disks are relatively optically thin tauB = 0.1, at least in the outermost regions, while they appear in general to be optically thick tauB > 1 when the apparent magnitude and average surface brightness are studied statistically.

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