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arXiv 1409.7786astro-ph.GA
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CALIFA巡天中哈勃序列上的Angular Momentum

Angular Momentum across the Hubble sequence from the CALIFA survey

Jesús Falcón-Barroso, Mariya Lyubenova, Glenn van de Ven, the CALIFA collaboration

摘要:

我们调查的恒星角动量的星系在哈勃序列从加州调查。CALIFA椭圆星系和透镜状星系在$λ_{\rm Re}-ε_{\rm e}$图中的分布与Atlas $^\mathrm{3D}$巡天所显示的一致。然而,我们的数据显示,螺旋星系在这张图中的位置是明显不同的。我们已经发现了两类具有特殊性质的旋涡星系:(a)旋涡星系的$λ_{\rm Re}$值比任何椭圆星系和透镜星系都要高得多;(b)低质量旋涡星系的观测到的$λ_{\rm Re}$值比它们表面扁平的预期值要低得多。我们用这两类天体来论证:(1)光是衰落不能解释螺旋星系向透镜星系的转变;(2)这些低质量螺旋星系实际上是由暗物质主导的,这解释了异常低的角动量。

英文摘要:

We investigate the stellar angular momentum of galaxies across the Hubble sequence from the CALIFA survey. The distribution of CALIFA elliptical and lenticular galaxies in the $λ_{\rm Re}-ε_{\rm e}$ diagram is consistent with that shown by the Atlas$^\mathrm{3D}$ survey. Our data, however, show that the location of spiral galaxies in this diagram is significantly different. We have found two families of spiral galaxies with particularly peculiar properties: (a) spiral galaxies with much higher $λ_{\rm Re}$ values than any elliptical and lenticular galaxy; (b) low-mass spiral galaxies with observed $λ_{\rm Re}$ values much lower than expected for their apparent flattening. We use these two families of objects to argue that (1) fading alone cannot explain the transformation of spiral to lenticular galaxies, and (2) that those low-mass spiral galaxies are in fact dark matter dominated, which explains the unusually low angular momentum.

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