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

Based on the dynamical black hole (BH) mass estimates, NGC3115 hosts theclosest billion solar mass BH. Deep studies of the center revealed a veryunderluminous active galactic nucleus (AGN) immersed in an old massive nuclearstar cluster. Recent $1$~Ms \textit{Chandra} X-ray visionary projectobservations of the NGC3115 nucleus resolved hot tenuous gas, which fuels theAGN. In this paper we connect the processes in the nuclear star cluster withthe feeding of the supermassive BH. We model the hot gas flow sustained by theinjection of matter and energy from the stars and supernova explosions. Weincorporate electron heat conduction as the small-scale feedback mechanism, thegravitational pull of the stellar mass, cooling, and Coulomb collisions.Fitting simulated X-ray emission to the spatially and spectrally resolvedobserved data, we find the best-fitting solutions with $\chi^2/dof=1.00$ for$dof=236$ both with and without conduction. The radial modeling favors a low BHmass $<1.3\times10^{9}M_\odot$. The best-fitting supernova rate and thebest-fitting mass injection rate are consistent with their expected values. Thestagnation point is at $r_{\rm st}\lesssim1$arcsec, so that most of gas,including the gas at a Bondi radius $r_B=2-4$arcsec, outflows from the region.We put an upper limit on the accretion rate at $2\times10^{-3}M_\odot{\rmyr}^{-1}$. We find a shallow density profile $n\propto r^{-\beta}$ with$\beta\approx1$ over a large dynamic range. This density profile is determinedin the feeding region $0.5-10$arcsec as an interplay of four processes andeffects: (1) the radius-dependent mass injection, (2) the effect of thegalactic gravitational potential, (3) the accretion flow onset at$r\lesssim1$arcsec, and (4) the outflow at $r\gtrsim1$arcsec. The gastemperature is close to the virial temperature $T_v$ at any radius.

Modeling Hot Gas Flow in the Low-Luminosity Active Galactic Nucleus of NGC3115