Messier 31的深宽场HI成像
Deep wide field HI imaging of Messier 31
摘要：
我们报告的初步结果，从一个新的深21厘米调查的仙女座星系，根据观测进行的综合望远镜和26米天线在DRAO。分析了圆盘的HI分布和运动学特性，导出了圆盘的基本动力学性质。新的HI结构被发现，如薄HI马刺状结构和在磁盘的外围的外部臂。HI的毛刺与M31主盘外受扰动的恒星团有关。外旋臂位于银河系的远侧，后退的一侧，在相反的一侧没有明显的对应物。这些HI扰动可能是由于潮汐与同伴的相互作用。发现它的动力学质量为4.7 +/- 0.5 x10^11 Msol，包围在半径R = 38 kpc内，维里半径内的总质量约为1 x10^12 Msol。
英文摘要：
We report on preliminary results from a new deep 21-cm survey of the Andromeda galaxy, based on observations performed with the Synthesis Telescope and the 26-m antenna at DRAO. The HI distribution and kinematics of the disc are analyzed and basic dynamical properties are derived. New HI structures are discovered, like thin HI spur-like structures and an external arm in the disc outskirts. The HI spurs are related to perturbed stellar clumps outside the main disc of M31. The external arm lies on the far, receding side of the galaxy and has no obvious counterpart in the opposite side. These HI perturbations probably result from tidal interactions with companions. It is found a dynamical mass of 4.7 +/- 0.5 x10^11 Msol enclosed within a radius R = 38 kpc and a total mass of ~1 x10^12 Msol inside the virial radius.
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