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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Semi-analytical models in a $\Lambda$CDM cosmology have predicted thepresence of outlying, "overmassive" black holes at the high-mass end of the(black hole mass -- galaxy velocity dispersion) $M_{\rm BH} - \sigma$ diagram(which we update here with a sample of 89 galaxies). They are a consequence ofhaving experienced more dry mergers -- thought not to increase a galaxy'svelocity dispersion -- than the "main-sequence" population. Wet mergers andgas-rich processes, on the other hand, preserve the main correlation. Due tothe scouring action of binary supermassive black holes, the extent of these drymergers (since the last significant wet merger) can be traced by the ratiobetween the central stellar mass deficit and the black hole mass ($M_{\rmdef,*} / M_{\rm BH}$). However, in a sample of 23 galaxies with partiallydepleted cores, including central cluster galaxies, we show that the"overmassive" black holes are actually hosted by galaxies that appear to haveundergone the lowest degree of such merging. In addition, the rotationalkinematics of 37 galaxies in the $M_{\rm BH} - \sigma$ diagram reveals thatfast and slow rotators are not significantly offset from each other, alsocontrary to what is expected if these two populations were the product of wetand dry mergers respectively. The observations are thus not in accordance withmodel predictions and further investigation is required.

Overmassive black holes in the $M_{\rm BH} - \sigma$ diagram do not belong to over (dry) merged galaxies