Rotation curve decomposition for size–mass relations of bulge, disk, and dark halo components in spiral galaxies
Rotation curve decomposition for size–mass relations of bulge, disk, and dark halo components in spiral galaxies
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DOI：
10.1093/pasj/psv103
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发表时间：
2015-10
影响因子：
2.3
通讯作者：
Y. Sofue
中科院分区：
文献类型：
--
作者：
Y. Sofue
从文献中收集了100多个旋涡星系的自转曲线，并利用χ拟合将其反卷积为球、盘和暗晕，以确定它们的尺度半径和质量。对满足选择和精度标准的星系进行了拟合参数的相关分析。大小-质量关系表明，大小和质量在不同的组成部分之间是正相关的，以这样一种方式，即较大或较大的质量是暗晕，较大或较大的质量是盘和隆起。通过最小二乘拟合得到了球、盘和暗晕的经验尺寸质量关系。盘晕质量比被发现是系统的三倍，比宇宙学模拟结合测光预测。初步得到了暗晕的质量函数，它由Schechter函数和幂律函数表示。
Rotation curves of more than one hundred spiral galaxies were compiled from the literature, and deconvolved into bulge, disk, and dark halo using χ fitting in order to determine their scale radii and masses. Correlation analyses were obtained of the fitting parameters for galaxies that satisfied selection and accuracy criteria. Size-mass relations indicate that the sizes and masses are positively correlated among different components in such a way that the larger or more massive is the dark halo, the larger or more massive are the disk and bulge. Empirical size-mass relations were obtained for bulge, disk and dark halo by the least-squares fitting. The disk-to-halo mass ratio was found to be systematically greater by a factor of three than that predicted by cosmological simulations combined with photometry. A preliminary mass function for dark halo was obtained, which is represented by the Schechter function followed by a power law.