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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

One of the greatest issues in modelling black hole fuelling is our lack ofunderstanding of the processes by which gas loses angular momentum and fallsfrom galactic scales down to the nuclear region where an accretion disc forms,subsequently guiding the inflow of gas down to the black hole horizon. It isfeared that gas at larger scales might still retain enough angular momentum andsettle into a larger scale disc with very low or no inflow to form or replenishthe inner accretion disc (on ~0.01 pc scales). In this paper we report onhydrodynamical simulations of rotating infalling gas shells impacting atdifferent angles onto a pre-existing, primitive large scale (~10 pc) discaround a super-massive black hole. The aim is to explore how the interactionbetween the shell and the disc redistributes the angular momentum on scalesclose to the black hole's sphere of influence. Angular momentum redistributionvia hydrodynamical shocks leads to inflows of gas across the inner boundary,enhancing the inflow rate by more than 2-3 orders of magnitude. In all cases,the gas inflow rate across the inner parsec is higher than in the absence ofthe interaction, and the orientation of the angular momentum of the flow in theregion changes with time due to gas mixing. Warped discs or nested misalignedrings form depending on the angular momentum content of the infalling shellrelative to the disc. In the cases in which the shell falls in nearcounter-rotation, part of the resulting flows settle into an inner dense discwhich becomes more susceptible to mass transfer.

Overlapping Inflow Events as Catalysts for Supermassive Black Hole Growth