Signs of gas flows in the variable Balmer line profiles of the Seyfert galaxy nuclei NGC?3227 and NGC?7469

摘要

The data on the variable Balmer line profiles obtained by us for the Seyfert galaxy NGC3227 and NGC7469 nuclei and published separately during1975-2006, were combined with the data compiled from literature, and reviewed in this paper. We hypothesize that the profile variations are connected with three independent regions of different physical conditions:1)Classical broad line region(BLR) of size cm is ionized and excited by the central source radiation. The central source brightness variations in 1971-1972 produced gas parameter variations of 109cmcm-3 and KK. 2)The profiles of the Balmer lines contain narrow components that have retained their positions (radial velocities) over25 and 17years in NGC3227 and NGC7469, respectively. These components are supposed to be caused by long-lived gas flows in the nuclei of the galaxies. Observational data acquired by Rubin and Ford allow us to assume that gas in the flows can be explained by models of collision ionization and excitation of gas with self-absorption. It is dense and hot plasma with -1012cm-3 and K. 3)Broad blue bumps of radial velocities between -4000kms-1 and -5000kms-1 were detected in the Hprofile during a several day flare twice in NGC3227 nucleus and once in NGC7469. One can speculate that the flares are connected with short-lived ejections. The gas in the ejections was ionized and excited by collision processes with cm-3 and K.Key words: shock waves - galaxies: nuclei - black hole physics - line: profiles - line: formation - galaxies: active