Kavli Affiliate: Erin Kara
| First 5 Authors: XRISM Collaboration, Marc Audard, Hisamitsu Awaki, Ralf Ballhausen, Aya Bamba
| Summary:
We report a detailed spectroscopic study of the gas dynamics and hydrostatic
mass bias of the galaxy cluster Abell 2029, utilizing high-resolution
observations from XRISM Resolve. Abell 2029, known for its cool core and
relaxed X-ray morphology, provides an excellent opportunity to investigate the
influence of gas motions beyond the central region. Expanding upon prior
studies that revealed low turbulence and bulk motions within the core, our
analysis covers regions out to the scale radius $R_{2500}$ (670~kpc) based on
three radial pointings extending from the cluster center toward the northern
side. We obtain accurate measurements of bulk and turbulent velocities along
the line of sight. The results indicate that non-thermal pressure accounts for
no more than 2% of the total pressure at all radii, with a gradual decrease
outward. The observed radial trend differs from many numerical simulations,
which often predict an increase in non-thermal pressure fraction at larger
radii. These findings suggest that deviations from hydrostatic equilibrium are
small, leading to a hydrostatic mass bias of around 2% across the observed
area.
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