Kavli Affiliate: Catherine E. Grant
| First 5 Authors: Arnab Sarkar, Michael McDonald, Lindsey Bleem, Mark Bautz, Bradford A. Benson
| Summary:
We present joint South Pole Telescope (SPT) and XMM-Newton observations of 8
massive galaxy clusters (0.8–1.7$times$10$^{15}$ M$_{odot}$) spanning a
redshift range of 0.16 to 0.35. Employing a novel SZ+X-ray fitting technique,
we effectively constrain the thermodynamic properties of these clusters out to
the virial radius. The resulting best-fit electron density, deprojected
temperature, and deprojected pressure profiles are in good agreement with
previous observations of massive clusters. For the majority of the cluster
sample (5 out of 8 clusters), the entropy profiles exhibit a self-similar
behavior near the virial radius. We further derive hydrostatic mass, gas mass,
and gas fraction profiles for all clusters up to the virial radius. Comparing
the enclosed gas fraction profiles with the universal gas fraction profile, we
obtain non-thermal pressure fraction profiles for our cluster sample at
$>$$R_{500}$, demonstrating a steeper increase between $R_{500}$ and $R_{200}$
that is consistent with the hydrodynamical simulations. Our analysis yields
non-thermal pressure fraction ranges of 8–28% (median: 15 $pm$ 11%) at
$R_{500}$ and 21–35% (median: 27 $pm$ 12%) at $R_{200}$. Notably,
weak-lensing mass measurements are available for only four clusters in our
sample, and our recovered total cluster masses, after accounting for
non-thermal pressure, are consistent with these measurements.
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