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We present deep (250 ks) Chandra observations of the nearby galaxy group NGC1600, which has at its centre an ultramassive black hole (17$\pm$1.5 billionM$_{\odot}$). The exceptionally large mass of the black hole coupled with itslow redshift makes it one of only a handful of black holes for which spatiallyresolved temperature and density profiles can be obtained within the Bondiradius with the high spatial resolution of Chandra. We analyzed the hot gasproperties within the Bondi accretion radius R$_B$=1.2" - 1.7"= 0.38 - 0.54kpc. Within a $\sim\!3$ kpc radius, we find two temperature components withstatistical significance. Both the single temperature and two temperaturemodels show only a very slight rise in temperature towards the centre, and areconsistent with being flat. This is in contrast with the expectation from Bondiaccretion for a temperature profile which increases towards the centre, andappears to indicate that the dynamics of the gas are not being determined bythe central black hole. The density profile follows a relatively shallow$\rho\propto~r^{-[0.61\pm0.13]}$ relationship within the Bondi radius, whichsuggests that the true accretion rate on to the black hole may be lower thanthe classical Bondi accretion rate.

Probing within the Bondi radius of the ultramassive black hole in NGC 1600