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

We study the distribution of accretion rates onto supermassive black holes(SMBH) in AGNs of the local Universe ($z<0.15$) based on near-infrared and hardX-ray surveys (2MASS and Swift/BAT). Using sufficiently accurate black holemass estimates, we reliably estimated the Eddington ratio, $\lambda_{Edd}$, forapproximately half of the objects in the AGN sample; for the remaining ones weused a rougher estimate based on the correlation of $M_{BH}$ with the galaxystellar mass $M_\ast$. We found that for a wide range of galaxy masses,$9.28<\log(M_\ast/M_\odot)<12.28$, including the most massive galaxies in thelocal Universe, the distribution $f(\lambda_{Edd})$ above$\log{\lambda_{Edd}}=-3$ can be described by a power law with$M_\ast$-independent parameters, declining with a characteristic slope $\approx0.7$ up to the Eddington limit ($\log{\lambda_{Edd}}\sim 0$), where there isevidence for a break. In addition, there is evidence that at$\log{\lambda_{Edd}}<-3$ the dependence $f(\lambda_{Edd})$ has a lower slope orflattens out. The mean characteristic growth time of SMBHs at the present epochturns out to depend weakly on the galaxy stellar mass and to exceed thelifetime of the Universe but by no more than one order of magnitude. The meanduty cycle of SMBHs (the fraction of objects with $\lambda_{Edd}>0.01$) in thelocal Universe also depends weakly on $M_\ast$ and is 0.2-1%. These resultsconfirm the trends found in previous studies for the earlier Universe andrefine the parameters of the dependence $f(\lambda_{Edd}|M_\ast)$ at $z<0.15$.The revealed universal (weakly dependent on the galaxy stellar mass) pattern ofthe dependence $f(\lambda_{Edd})$ probably stems from the fact that, atpresent, the episodes of mass accretion onto SMBHs are associated mainly withstochastic processes in galactic nuclei rather than with global galaxyevolution processes.

The Growth Rate of Supermassive Black Holes and Its Dependence on the Stellar Mass of Galaxies at the Present Epoch