Kavli Affiliate: Michael McDonald
| First 5 Authors: Julie Hlavacek-Larrondo, Hyunseop Choi, Minghao Guo, Annabelle Richard-Laferrière, Carter Rhea
| Summary:
We present Space Telescope Imaging Spectrograph observations from the Hubble
Space Telescope of the supermassive black hole (SMBH) at the center of
PKS0745-191, a brightest cluster galaxy (BCG) undergoing powerful radio-mode
AGN feedback ($P_{rm cav}sim5times10^{45}$ erg s$^{-1}$). These
high-resolution data offer the first spatially resolved map of gas dynamics
within a SMBHs sphere of influence under such powerful feedback. Our results
reveal the presence of highly chaotic, non-rotational ionized gas flows on
sub-kpc scales, in contrast to the more coherent flows observed on larger
scales. While radio-mode feedback effectively thermalizes hot gas in galaxy
clusters on kiloparsec scales, within the core, the hot gas flow may decouple,
leading to a reduction in angular momentum and supplying ionized gas through
cooling, which could enhance accretion onto the SMBH. This process could, in
turn, lead to a self-regulating feedback loop. Compared to other BCGs with
weaker radio-mode feedback, where rotation is more stable, intense feedback may
lead to more chaotic flows, indicating a stronger coupling between jet activity
and gas dynamics. Additionally, we observe a sharp increase in velocity
dispersion near the nucleus, consistent with a very massive $M_{rm
BH}sim1.5times10^{10} M_odot$ SMBH. The density profile of the ionized gas
is also notably flat, paralleling the profiles observed in X-ray gas around
galaxies where the Bondi radius is resolved. These results provide valuable
insights into the complex mechanisms driving galaxy evolution, highlighting the
intricate relationship between SMBH fueling and AGN feedback within the host
galaxy.
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