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首页> 外文期刊>The Astrophysical Journal. Letters >Angular momentum and galaxy formation revisited: Effects of variable mass-to-light ratios
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Angular momentum and galaxy formation revisited: Effects of variable mass-to-light ratios

机译：角动量和星系形成的再探讨：变质轻比的影响

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We rederive the relation between the specific angular momentum j and the mass M of the stellar matter in galaxies of different morphological types. This is a revision of the j -M diagram presented in our recent comprehensive study of galactic angular momentum. In that work, we estimated j from kinematic and photometric data that extended to large radii and M from near-infrared luminosities L_K with an assumed universal mass-to-light ratio M /L_K. However, recent stellar population models show large variations in M /L_K correlated with B-V color. In the present work, we use this correlation to estimate M /L_K and hence M from the measured B-V and L_K. Our revised j -M diagram is similar to our previous one; both disk-dominated and elliptical galaxies follow nearly parallel sequences with and α = 0.6 ± 0.1. However, the offset between the sequences is now a factor of about 5, some 30% larger than before (and close to the offset found by Fall in 1983). Thus, our new results place even tighter constraints on the loss of specific angular momentum by galactic disks over their lifetimes.
机译：我们重新推导了不同形态类型的星系中比角动量j和恒星物质质量M之间的关系。这是对我们最近对银河角动量的全面研究中提出的j -M图的修订版。在这项工作中，我们从运动和光度学数据（扩展到大半径）估算了j，从近红外光度L_K估算了M，并假设了通用的质光比M / L_K。但是，最近的恒星种群模型显示与B-V颜色相关的M / L_K差异很大。在当前的工作中，我们使用这种相关性来估计M / L_K，从而从测得的B-V和L_K估计M。我们修改后的j -M图类似于我们以前的图。盘状星系和椭圆星系都遵循几乎平行的序列，且α= 0.6±0.1。但是，序列之间的偏移量现在是大约5倍，比以前大了30％（并且接近1983年Fall发现的偏移量）。因此，我们的新结果对银河星盘在其整个生命周期内损失的特定角动量施加了更为严格的约束。

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