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arXiv 0811.0700astro-ph
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早型星系NGC 4649(M60)的总质量

The total mass of the early-type galaxy NGC 4649 (M60)

S. Samurovic, M. M. Cirkovic

摘要:

本文分析了早型星系NGC4649(M60)的总质量和总质光比问题。我们使用了两种独立的技术:X射线方法,这是基于NGC 4649的X射线晕的温度和示踪剂质量估计(TME),它使用球状星团(GC)在这个星系中观察到的。我们计算了牛顿和修正牛顿动力学(MOND)方法的质量,发现内部3有效半径(Re)有没有需要大量的暗物质。3Re以后的暗物质开始扮演重要的动力学角色。我们还讨论了NGC 4649外部区域基于X射线和TME的总质量估计之间存在差异的可能原因。

英文摘要:

In this paper we analyze the problem of the total mass and the total mass-to-light ratio of the early-type galaxy NGC 4649 (M60). We have used two independent techniques: the X-ray methodology which is based on the temperature of the X-ray halo of NGC 4649 and the tracer mass estimator (TME) which uses globular clusters (GCs) observed in this galaxy. We calculated the mass in Newtonian and MOdified Newtonian Dynamics (MOND) approaches and found that interior to 3 effective radii (Re) there is no need for large amounts of dark matter. Beyond 3Re dark matter starts to play important dynamical role. We also discuss possible reasons for the discrepancy between the estimates of the total mass based on X-rays and TME in the outer regions of NGC 4649.

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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