arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.07937astro-ph.GA
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旋转重子暗晕

Rotating baryonic dark halos

F. De Paolis, A. V. Gurzadyan, A. A. Nucita, V. G. Gurzadyan, A. Qadir, A. Kashin, A. Amekhyan, S. Sargsyan, Ph. Jetzer, G. Ingrosso, N. Tahir

摘要:

星系晕对于我们理解扰动谱中的暗物质性质和原始非高斯性具有重要意义,扰动谱是产生今天观测到的宇宙学波动的物理机制的有力判别。在本文中,我们分析了{ \it普朗克}的数据对星系M104(草帽),发现在微波温度的不对称性,从银河系中心延伸到约$1 \degr$。这种频率无关的不对称性是一致的,由于银河系旋转的多普勒效应引起的,我们发现一个概率小于约$0.2\%$,这是由于随机波动的微波背景。此外,{ \it Planck}数据表明M104星系晕的动力学相对复杂,这似乎与以前的研究一致。鉴于我们以前对附近星系暗晕的分析,这一发现证实了该方法在揭示和绘制相对邻近的边缘星系周围暗晕方面的效率。

英文摘要:

Galactic halos are of great importance for our understanding of both the dark matter nature and primordial non-Gaussianity in the perturbation spectrum, a powerful discriminant of the physical mechanisms that generated the cosmological fluctuations observed today. In this paper we analyze {\it Planck} data towards the galaxy M104 (Sombrero) and find an asymmetry in the microwave temperature which extends up to about $1 \degr$ from the galactic center. This frequency-independent asymmetry is consistent with that induced by the Doppler effect due to the galactic rotation and we find a probability of less than about $0.2\%$ that it is due to a random fluctuation of the microwave background. In addition, {\it Planck} data indicate the relatively complex dynamics of the M104 galactic halo, and this appears to be in agreement with previous studies. In view of our previous analysis of the dark halos of nearby galaxies, this finding confirms the efficiency of the method used in revealing and mapping the dark halos around relatively nearby edge-on galaxies.

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