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arXiv 1808.04508astro-ph.GA
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UM 461和CTS 1020的内部激酶

Internal Kinematics of UM 461 and CTS 1020

Maiara S. Carvalho, Henri Plana

摘要:

我们用积分场光谱研究了H\,{ \sc ii}星系CTS 1020和UM 461的内部运动学.我们的分析基于速度和速度频散图,以及强度-速度频散($I-σ$)和速度-速度频散($V_r-σ$)图。我们发现UM 461的两个恒星形成结的运动具有不同的模式,表明结之间的运动学联系较弱。银河系的整体运动学可能受到恒星反馈的影响。CTS 1020具有有序的运动,其梯度与以$\sim50$ km s $^{-1}$旋转的盘兼容,尽管速度场被干扰。在这两个星系的最高和最低的$σ$值分布在外部的部分,并与弥漫的气体渗透的星系。UM 461有一个环状结构,在东部结中有小区域的$σ$增加,这类似于我们在恒星形成的收集和崩溃场景中所期望的。我们发现UM 461似乎更容易受到恒星反馈的影响,而在CTS 1020中,引力势占主导地位。

英文摘要:

We have used integral field spectroscopy to study the internal kinematics of the H\,{\sc ii} galaxies CTS 1020 and UM 461. We based our analysis on the velocity and velocity dispersion maps, and intensity-velocity dispersion ($I-σ$) and velocity-velocity dispersion ($V_r-σ$) diagrams. We found that the motion in both star-forming knots of UM 461 has different patterns, suggesting a weak kinematical connection between the knots. The overall kinematics of the galaxy is probably affected by stellar feedback. CTS 1020 has an ordered motion with a gradient compatible with a disc rotating at $\sim50$ km s$^{-1}$, though the velocity field is disturbed. In both galaxies the highest and lowest $σ$ values are distributed in the outer parts and are associated with the diffuse gas that permeates the galaxies. UM 461 has a ring-like structure with small regions of increasing $σ$ in the eastern knot, which resemble what we could expect in a collect and collapse scenario of star formation. We found that UM 461 seems to be more susceptible to stellar feedback, whereas in CTS 1020 the gravitational potential dominates.

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