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Extremely high-velocity gas in the galaxy Arp 220, revealed with ammonia absorption lines

机译:星系Arp 220中的极高速气体,通过氨吸收线显示

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We observed ammonia (J, K) = (1, 1), (2,2),(3,3), and (4,4) transitions at a wavelength of 1.3 cm toward a prototypical ultraluminous infrared galaxy, Arp 220, with the Nobeyama 45-m radio telescope. We detected extremely wide absorption lines at the (1, 1) and (3, 3) transitions. The maximum total velocity width was similar to 1800 km s(-1). Such wide molecular absorption lines were detected for the first time in galaxies. The absorption lines are formed by ammonia only in front of the central compact continuum emission (similar to 1" = 370 pc). The present results clearly indicate the existence of extremely high-velocity motion in the central compact region of Arp 220. A possible origin of such motion is rapidly rotating gas, suggesting the existence of an active galactic nucleus, or outflowing or inflowing gas.
机译:我们观察到氨(J,K)=(1,1),(2,2),(3,3)和(4,4)在1.3 cm的波长处向原型超发光红外星系Arp 220过渡,使用Nobeyama 45米射电望远镜。我们在(1,1)和(3,3)跃迁处检测到非常宽的吸收线。最大总速度宽度类似于1800 km s(-1)。在银河系中首次检测到如此宽的分子吸收线。吸收线仅在中央紧凑型连续体发射(类似于1“ = 370 pc)之前由氨形成。目前的结果清楚地表明,Arp 220的中央紧凑型区域中存在极高速度的运动。这种运动的起源是快速旋转的气体,表明存在活跃的银河核,或者存在流出或流入的气体。

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