Kavli Affiliate: Blake Sherwin
| First 5 Authors: William R. Coulton, Adriaan J. Duivenvoorden, Zachary Atkins, Nicholas Battaglia, Elia Stefano Battistelli
| Summary:
The high electron temperature in galaxy clusters ($>1,$keV or $>10^7,$K)
leads to corrections at the level of a few percent in their thermal
Sunyaev-Zeldovich effect signatures. Both the size and frequency dependence of
these corrections, which are known as relativistic temperature corrections,
depend upon the temperature of the objects. In this work we exploit this effect
to measure the average temperature of a stack of Compton-$y$ selected clusters.
Specifically, we apply the "spectroscopic method" and search for the
temperature that best fits the clusters’ signal measured at frequencies from 30
to 545 GHz by the Atacama Cosmology Telescope and Planck satellite. We measure
the average temperature of clusters detected in the ACT maps to be $8.5pm
2.4,$keV, with an additional systematic error of comparable amplitude
dominated by passband uncertainty. Upcoming surveys, such as the Simons
Observatory and CMB-S4, have the potential to dramatically improve upon these
measurements and thereby enable precision studies of cluster temperatures with
millimeter observations. The key challenge for future observations will be
mitigating instrumental systematic effects, which already limit this analysis.
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