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arXiv 2302.02376astro-ph.GA
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团心距还是局域密度?这取决于星系形态

Clustercentric distance or local density? It depends on galaxy morphology

B. Vulcani, B. M. Poggianti, M. Gullieuszik, A. Moretti, J. Fritz, D. Bettoni, B. Facciolli, G. Fasano, A. Omizzolo

AI总结:

基于OmegaWINGS巡天,本文研究星系团内椭圆、S0和旋涡星系比例的调控因素,发现局域密度与团心距的作用随星系形态和径向区域而不同。

摘要:

在投影局域密度与到星系团中心的距离之间,究竟哪一个在调控星系团中的形态比例方面起主要作用,是一个长期存在的争论。得出明确答案将有助于阐明在最极端环境中发挥作用的主要物理机制。本文利用OmegaWINGS巡天的数据,将此前的分析扩展到维里半径之外;OmegaWINGS是目前局域宇宙中最大的星系团巡天,其覆盖范围延伸至距星系团核心2个维里半径以外。局域密度和团心距似乎对不同形态的星系发挥不同作用:椭圆星系的比例主要取决于局域密度,这表明它们的形成与原初密度有关,而这些原初密度如今对应于星系团核心。只有低质量椭圆星系的比例与团心距呈反相关,表明这些天体具有不同的起源。排除椭圆星系后,S0星系与旋涡星系的相对比例仅在远离星系团核心处取决于局域密度,而在维里半径以内,它们的比例由距离调控,这表明星系团特有的过程终止了恒星形成,并将Sp星系转化为S0星系。这一解释得到了文献中关于早型和晚型星系运动学分析结果的支持:根据这些结果,快速旋转体和慢速旋转体对晕质量和局域密度具有不同的依赖关系。

英文摘要:

Determining which between projected local density and distance from the cluster center plays a major role in regulating morphological fractions in clusters is a longstanding debate. Reaching a definitive answer will shed light on the main physical mechanisms at play in the most extreme environments. Here we make use of the data from the OmegaWINGS survey, currently the largest survey of clusters in the local Universe extending beyond 2 virial radii from the cluster cores, to extend previous analysis outside the virial radius. Local density and clustercentric distance seems to play different roles for galaxies of different morphology: the fraction of elliptical galaxies mainly depends on local density, suggesting that their formation was linked to the primordial densities, which now correspond to the cluster cores. Only the fraction of low mass ellipticals shows an anticorrelation with clustercentric distance, suggesting a different origin for these objects. Excluding elliptical galaxies, the relative fraction of S0s and spirals instead depends on local density only far from the cluster cores, while within the virial radius their proportion is regulated by distance, suggesting that cluster specific processes halt the star formation and transform Sp galaxies into S0s. This interpretation is supported by literature results on the kinematical analysis of early and late type galaxies, according to which fast and slow rotators have distinct dependencies on halo mass and local density.

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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