The rotation of the galactic halos is a fascinating topic which is still waiting to be addressed. Planck data have shown the existence of a temperature asymmetry towards the halo of several nearby galaxies, such as M31, NGC 5128, M33, M81 and M82. However, the cause of this asymmetry is an open problem. A possibility to explain the observed effect relies on the presence of “cold gas clouds” populating the galactic halos, which may be the answer to the so-called missing baryon problem. Here, we present a technique to estimate an upper limit to the rotational velocity of the halo of some nearby spiral galaxies using both their dynamical masses and the Planck data.

中文翻译：

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使用普朗克数据查看附近旋涡星系的光晕旋转

银河光环的旋转是一个引人入胜的话题，尚待解决。普朗克的数据表明，附近几个星系（例如M31，NGC 5128，M33，M81和M82）的晕圈存在温度不对称性。但是，这种不对称的原因是一个未解决的问题。解释观测到的效应的可能性取决于银河系光晕中是否存在“冷气云”，这可能是对所谓的缺失重子问题的解答。在这里，我们提出了一种使用其动态质量和普朗克数据来估算附近一些螺旋星系的光晕旋转速度上限的技术。