NGC 4151 and Markarian 6 - two intermediate-type Seyfert galaxies

Scans are presented showing there is a continuous transition between sSeyfert I and Seyfert 2 galaxies, and that NGC 415 I and Markarian 6, swith Balmerline profiles consisting of sharp components superimposed on sbroad weak components, are intermediate objects in this classification sscheme. Relative emission-line intensity measurements of NGC 4151 from sthese scans are presented and compared with other recent published sresults. In confirmation of the conclusion of Boksenberg et al., the sbroad line profiles of H and He do not agree with those predicted from sthe model of Ptak & Stoner based on charge exchange with ssuprathermal ions in a gas at rest.