Evidence for the Ejection of Matter from the Nucleus of the Seyfert Galaxy NGC 4151
Citations Over TimeTop 18% of 1969 papers
Abstract
At least three shell lines of He i (X03889) arising from the metastable 23S state are found in absorption in the spectrum of the nucleus of NGC 4151. Corresponding shell lines of hydrogen are found or suspected to exist in at least H~ and fly. Velocities of ejection of up to -970 km sec~' are measured If the mass of the nucleus is <10~ 9J~o, much of the mass will be ejected to infinity at an estimated rate of between 10 and 1O~ ~i1o yr1. (The lower limit is based on an assumed radius of 5 Pc for the source of ionizing radia- tion.) No absorption lines have been detected corresponding to material recycled into the nucleus. The amount of neutral hydrogen in the nucleus, consistent with the strengths of these shell lines, is sufficient to explain the wide Balmer wings as a result of electron scattering
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