Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected clusters from Future CMB Surveys. (arXiv:2107.10250v1 [astro-ph.CO])

Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected clusters from Future CMB Surveys. (arXiv:2107.10250v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Raghunathan_S/0/1/0/all/0/1">Srinivasan Raghunathan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Whitehorn_N/0/1/0/all/0/1">Nathan Whitehorn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Alvarez_M/0/1/0/all/0/1">Marcelo A. Alvarez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Aung_H/0/1/0/all/0/1">Han Aung</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Battaglia_N/0/1/0/all/0/1">Nicholas Battaglia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Holder_G/0/1/0/all/0/1">Gilbert P. Holder</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nagai_D/0/1/0/all/0/1">Daisuke Nagai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pierpaoli_E/0/1/0/all/0/1">Elena Pierpaoli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reichardt_C/0/1/0/all/0/1">Christian L. Reichardt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vieira_J/0/1/0/all/0/1">Joaquin D. Vieira</a>

We forecast the number of galaxy clusters that can be detected via the
thermal Sunyaev-Zeldovich (tSZ) signals by future cosmic microwave background
(CMB) experiments, primarily the wide area survey of the CMB-S4 experiment but
also CMB-S4’s smaller delensing survey and the proposed CMB-HD experiment. We
predict that CMB-S4 will detect 75,000 clusters with its wide survey of $f_{rm
sky}$ = 50% and 14,000 clusters with its deep survey of $f_{rm sky}$ = 3%. Of
these, approximately 1350 clusters will be at $z ge 2$, a regime that is
difficult to probe by optical or X-ray surveys. We assume CMB-HD will survey
the same sky as the S4-Wide{}, and find that CMB-HD will detect $times3$ more
overall and an order of magnitude more $z ge 2$ clusters than CMB-S4. These
results include galactic and extragalactic foregrounds along with atmospheric
and instrumental noise. Using CMB-cluster lensing to calibrate cluster tSZ-mass
scaling relation, we combine cluster counts with primary CMB to obtain
cosmological constraints for a two parameter extension of the standard model
($Lambda CDM+sum m_{nu}+w_{0}$). Besides constraining $sigma(w_{0})$ to
$lesssim 1%$, we find that both surveys can enable a $sim 2.5-4.5sigma$
detection of $sum m_{nu}$, substantially strengthening CMB-only constraints.
We also study the evolution of intracluster medium by modelling the cluster
virialization ${rm v}(z)$ and find tight constraints from CMB-S4, with further
factors of 3-4 improvement for CMB-HD.

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