X-ray absorbing column NH vs. Seyfert subtype. The symbols for subtypes 1.5 and 2 have been randomly shifted by a small amount for better readability. The symbol colour indicates the optical obscuration to the hot dust. The solid and dashed lines indicate two possible consistent dividing lines between optically unobscured/obscured and X-ray unabsorbed/absorbed.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.