阿贝尔2566星系团中的荡漾冷锋

IF 1.9 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

New Astronomy Pub Date : 2024-05-28 DOI:10.1016/j.newast.2024.102253

S.K. Kadam , S.S. Sonkamble , N.D. Vagshette , M.K. Patil

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引用次数: 0

摘要

本文根据对 20 ks 钱德拉 X 射线数据的分析，介绍了冷核星团 Abell 2566（红移 z = 0.08247）环境中星团内介质（ICM）的特性。对该星团的钱德拉数据进行的二维成像分析表明，在中心 109 kpc 范围内的 X 射线辐射形态中，存在着由于气体荡动而形成的螺旋结构。该分析还发现，在 41.6 kpc 和 77.4 kpc 的 X 射线峰值的东南和西北方向，表面亮度分布存在尖锐的边缘。对沿这些不连续面的 0.5-7 千伏 X 射线光子进行的光谱分析显示，温度分别从 2.3 千伏跃升到 3.1 千伏，从 1.8 千伏跃升到 2.8 千伏，而且压力剖面一致，这意味着它们与气体荡动引起的冷锋有关。对这些楔形扇形区域的表面亮度分布进行的破碎幂律密度函数拟合进一步证实了这种关联。这项研究还发现 BCG 与 X 射线峰之间存在 4.6′′（6.8 kpc）的偏移，BCG 与中心区域的一个子系统发生了相互作用，这表明螺旋结构的起源是由于一次小规模合并造成的。

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Sloshing cold fronts in galaxy cluster Abell 2566

This paper presents properties of the intracluster medium (ICM) in the environment of a cool core cluster Abell 2566 (redshift $z$ $=$ 0.08247) based on the analysis of 20 ks Chandra X-ray data. 2D imaging analysis of the Chandra data from this cluster revealed spiral structures in the morphology of X-ray emission from within the central 109 kpc formed due to gas sloshing. This analysis also witness sharp edges in the surface brightness distribution along the south-east and north-west of the X-ray peaks at 41.6 kpc and 77.4 kpc, respectively. Spectral analysis of 0.5 – 7 keV X-ray photons along these discontinuities exhibited sharp temperature jumps from 2.3 to 3.1 keV and 1.8 to 2.8 keV, respectively, with consistency in the pressure profiles, implying their association with cold fronts due to gas sloshing of the gas. Further confirmation for such an association was provided by the deprojected broken power-law density function fit to the surface brightness distribution along these wedge shaped sectorial regions. This study also witness an offset of 4.6 $^{''}$ (6.8 kpc) between the BCG and the X-ray peak, and interaction of the BCG with a sub-system in the central region, pointing towards the origin of the spiral structure due to a minor merger.

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来源期刊

New Astronomy 地学天文-天文与天体物理

CiteScore

4.00

自引率

10.00%

发文量

109

审稿时长

13.6 weeks

期刊介绍： New Astronomy publishes articles in all fields of astronomy and astrophysics, with a particular focus on computational astronomy: mathematical and astronomy techniques and methodology, simulations, modelling and numerical results and computational techniques in instrumentation. New Astronomy includes full length research articles and review articles. The journal covers solar, stellar, galactic and extragalactic astronomy and astrophysics. It reports on original research in all wavelength bands, ranging from radio to gamma-ray.