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THE INNER SCALE LENGTH OF SPIRAL GALAXY ROTATION CURVES

机译:螺旋星系旋转曲线的内尺度长度

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We use the tapering effect of Hα/[N Ⅱ] rotation curves of spiral galaxies first noted by Goad & Roberts to investigate the internal extinction in disks. The scale length of exponential fits to the inner part of rotation curves depends strongly on the disk axial ratio. Preliminary modeling of the effect implies substantial opacity of the central parts of disks at a wavelength of 0.66 μm. In addition, the average kinematic scale length of rotation curves, when corrected to face-on perspective, has a nearly constant value of about 1.7 h~(-1) kpc for all luminosity classes. The interpretation of that effect, as the result of the increasing dominance of the baryonic mass in the inner parts of galaxies, yields a mean baryonic mass-to-light ratio in the Ⅰ band of Υ_I = 2.7 h solar mass/(solar luminosity), I, within the inner 1.7 h~(-1) kpc of disks.
机译:我们利用Goad&Roberts首先指出的旋涡星系Hα/ [NⅡ]旋转曲线的渐缩效应来研究盘的内部消光。旋转曲线内部的指数拟合的刻度长度在很大程度上取决于圆盘的轴向比率。对效果的初步建模意味着在0.66μm的波长下,圆盘中心部分基本不透明。此外,旋转曲线的平均运动尺度长度,当校正为面向正面的角度时,对于所有发光度类别都具有大约1.7 h〜(-1)kpc的几乎恒定的值。对这种效应的解释是,由于星系内部重子质量占主导地位,在band_I = 2.7 h太阳质量/(太阳光度)的Ⅰ波段中产生了平均重子质量与光之比。 I,在内部1.7 h〜(-1)kpc磁盘内。

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