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arXiv 2301.03249astro-ph.GA
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用Planck数据研究星系晕转动

On the Galactic Halos Rotation by Planck Data

Noraiz Tahir, Francesco De Paolis, Asghar Qadir, Achille A. Nucita

摘要:

由于星系晕不是直接可见的,关于它们的组成和旋转速度有许多不明确的地方。虽然大部分暗物质是非重子物质,但{ \it有一部分是},它可以用来追踪晕的旋转。在普朗克的数据中已经看到了CMB对M31的不对称性,并将其归因于M31晕的旋转多普勒频移。随后,同样的方法被用于本星系群的其他五个星系,即M33,M81,M82,NGC 5128和NGC 4594。已经证明,在2.7 K时,可能存在与CMB处于热平衡的稳定的气体和尘埃云,这种云被称为"维里云“。本文采用这种情况,试图对尘埃粒子和气体分子在云中的分数进行约束。

英文摘要:

As galactic halos are not directly visible, there are many ambiguities regarding their composition and rotational velocity. Though most of the dark matter is non-baryonic, {\it some fraction is}, and it can be used to trace the halo rotation. Asymmetries in the CMB towards M31 had been seen in the Planck data and ascribed to the rotational Doppler shift of the M31 halo. Subsequently, the same methods were used in the direction of five other galaxies belonging to the Local Group, namely M33, M81, M82, NGC 5128, and NGC 4594. It had been proved that there could be stable clouds of gas and dust in thermal equilibrium with the CMB at 2.7 K, which had been called ``virial clouds''. In this paper, adopting this scenerio, an attempt is made to constrain the fraction of dust grains and gas molecules in the clouds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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