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arXiv 1005.5294astro-ph.CO
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马林1:相互作用的星系对?

Malin 1: interacting galaxy pair?

V. P. Reshetnikov, A. V. Moiseev, N. Ya. Sotnikova

摘要:

马林1是一个独特的,非常大的低表面亮度星系。银河系的结构和起源知之甚少。造成这种情况的原因是缺乏详细的观测数据,特别是高分辨率的运动学数据。在这封信中,我们研究了Malin 1内部(r < 15 kpc)的恒星运动学。我们目前的光谱参数有利于一个小星系-马林1B -是一个同伴可能与主星系-马林1。这个天体在马林1号的许多已发表的图像中清晰可见,但在任何天文数据库中都没有提到。Malin 1B位于距离Malin 1的核心14 kpc的投影距离处,并且具有小的- 65 $\pm$ 16 km/s -相对速度,这是我们首次确定的。我们认为,正在进行的相互作用与马林1B可以解释的主要形态特征的马林1的中心区域-双臂螺旋结构,酒吧,和外部单臂螺旋图案。我们还研究了Malin 1的大尺度环境,并假设星系SDSS J123708.91+142253.2可能是通过与Malin 1的正面碰撞形成扩展的低表面亮度包络的原因(在Mapelli等人2008年提出的碰撞方案框架内)。为了检验马林1全球结构的碰撞起源,需要更多的观测数据和新的数值模式。

英文摘要:

Malin 1 is a unique, extraordinarily large low surface brightness galaxy. The structure and the origins of the galaxy are poorly understood. The reason for such a situation is an absence of detailed observational data, especially, of high-resolution kinematics. In this Letter we study the stellar kinematics of the inner part (r < 15 kpc) of Malin 1. We present spectroscopic arguments in favour of a small galaxy - Malin 1B - being a companion probably interacting with the main galaxy - Malin 1. This object is clearly seen in many published images of Malin 1 but is not mentioned in any astronomical databases. Malin 1B is located at the projected distance of 14 kpc from the Malin 1's nucleus and has small - 65$\pm$16 km/s - relative velocity, which we determined for the first time. We suggest that ongoing interaction with Malin 1B can explain main morphological features of the Malin 1's central region - two-armed spiral structure, a bar, and an external one-armed spiral pattern. We also investigated the large scale environment of Malin 1 and postulate that the galaxy SDSS J123708.91+142253.2 might be responsible for the formation of extended low-surface brightness envelope by means of head-on collision with Malin 1 (in the framework of collision scenario proposed by Mapelli et al. 2008). To test the collisional origins of Malin 1 global structure, more observational data and new numerical models are needed.

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