Probing Milky Way's hot gas halo density distribution using the dispersion measure of pulsars
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- 作者：Ya. V. Zhezher ; E. Ya. Nugaev ; G. I. Rubtsov
- 关键词：missing baryons ; hot gas ; pulsars ; dispersion measure
- 刊名：Astronomy Letters
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：42
- 期：3
- 页码：173-181
- 全文大小：772 KB
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E. Ya. Nugaev (1)
G. I. Rubtsov (1)
1. Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, 117312, Russia
2. Faculty of Physics, Moscow State University, Moscow, 119991, Russia
Astronomy
Astrophysics
Russian Library of Science
文摘
A number of recent studies indicates a significant amount of ionized gas in a form of the hot gas halo around the Milky Way. The halo extends over the region of 100 kpc and may be acountable for the missing baryon mass. In this paper we calculate the contribution of the proposed halo to the dispersion measure (DM) of the pulsars. The Navarro, Frenk, and White (NFW), Maller and Bullock (MB), and Feldmann, Hooper, and Gnedin (FHG) density distibutions are considered for the gas halo. The data set includes pulsars with the distance known independently from the DM, e.g., pulsars in globular clusters, LMC, SMC and pulsars with known parallax. The results exclude the NFW distribution for the hot gas, while the more realisticMB and FHG models are compatible with the observed dispersion measure.