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AGN Feeding and Feedback in M84: From Kiloparsec Scales to the Bondi Radius

Presentation #401.02 in the session Active Galactic Nuclei II.

Published onJul 01, 2023
AGN Feeding and Feedback in M84: From Kiloparsec Scales to the Bondi Radius

We present the deepest Chandra observation to date of the elliptical galaxy M84 in the Virgo Cluster, with over 840 kiloseconds of data provided by both legacy observations and a recent 730 kilosecond campaign. The increased signal to noise provided by such a deep observation allows us to study the origins of the accretion flow feeding the supermassive black hole in the center of M84 from the kiloparsec scales of the X-ray halo to the Bondi radius of the black hole. Temperature, metallicity, and deprojected density profiles are obtained in four sectors about the AGN, extending into the Bondi radius. Rather than being dictated by the gravitational potential of the black hole, the accretion flow in M84 is strongly influenced by the bipolar radio jets emanating from the AGN. Along the jet axis, the density profile is consistent with ne ~ r-1; however, the profiles flatten perpendicular to the jet. The radio jets produce a significant asymmetry in the accretion flow, violating a key assumption of the Bondi solution. Temperature in the inner kiloparsec is approximately constant, with only a slight increase from 0.6 to 0.7 keV approaching the Bondi radius, and there is no evidence for a temperature increase imposed by the potential of the black hole. The Bondi accretion rate exceeds the accretion rate inferred from AGN jet power and luminosity by over four orders of magnitude. In sectors perpendicular to the jet axis, Bondi accretion rate measurements agree within 1σ. However, the accretion rate is >4σ lower along the jet axis in the North sector, where it can be constrained, likely imposed by cavities in the X-ray emitting gas. Our measurements provide unique insight into the large-scale feeding of AGN responsible for radio mode feedback in clusters of galaxies.

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