English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The evidence from velocity-resolved reverberation mapping showing a netinfall of the broad-line region (BLR) of AGNs is reviewed. Different lines inmany objects at different epochs give a consistent picture of BLR motions. Themotions are dominated by virialized motion (rotation plus turbulence) withsignificant net inflow. The BLR mass influx is sufficient to power the AGN. Theincreasing blueshifting of lines with increasing ionization potential is aconsequence of scattering off infalling material. The high blueshiftings of theUV lines in Narrow-Line Seyfert 1s are due to enhanced BLR inflow rates ratherthan strong winds. Seemingly conflicting cases of apparent outflowreverberation mapping signatures are a result of the breakdown of theaxial-symmetry assumption in reverberation mapping. There are several plausiblecauses of this breakdown: high-energy variability tends to be intrinsicallyanisotropic, regions of variability are necessarily located off-axis, and X-rayobservations reveal major changes in line-of-sight column densities close tothe black hole. Results from reverberation mapping campaigns dominated by asingle event need to be treated with caution.

Inflow of the Broad-Line Region and the Fundamental Limitations of Reverberation Mapping