GBT24A-249

Resolving SZ-selected clusters in the epoch of most rapid cluster growth

Abstract

Sunyaev-Zeldovich (SZ) surveys are currently the most powerful and consistent method of detecting high-mass, high-z galaxy clusters, which are uniquely sensitive to cosmology and the growth of structure in our Universe. This proposal aims to investigate a pilot sample that comprises 7 massive ACTPol-selected galaxy clusters with redshifts greater than 1.25, observed during the nighttime this semester using the GBT. This endeavor presents a unique opportunity to explore the thermodynamic properties of such high-mass, high-redshift galaxy clusters in an epoch currently unexplored in the (sub)mm regime.

Our objects are: (1) To jointly model relatively short Mustang-2 observations (~100-1000 times shorter than comparable X-ray integration times) with public single-dish ACT observations to model the pressure distribution of the intracluster medium from the core to the virial radius. (2) With these de-projected pressure profiles, we will map each cluster's dynamical state and morphology and search for evolutionary trends when compared to local surveys. (3) Search for mergers and shock-fronts in this violent formation epoch, only accessible through high-spatial resolution Mustang-2 observations.

Investigators

Name	Institution
Joshiwa van Marrewijk *	European Southern Observatory
Emily Moravec	Green Bank Observatory; Akademie ved Ceske republiky
Simon Dicker	Pennsylvania, University of
Tony Mroczkowski	European Southern Observatory
IAN LOWE	Arizona, University of; Pennsylvania, University of
Luca Di Mascolo	Max-Planck-Institut für Astrophysik; Trieste, Università degli Studi di
Charles Romero	Pennsylvania, University of; Virginia, University of; Center for Astrophysics | Harvard & Smithsonian
Saianeesh Haridas	Pennsylvania, University of
Tanay Bhandarkar	Pennsylvania, University of
Julia Robe	Pennsylvania, University of
Brian Mason	National Radio Astronomy Observatory
Karen Perez Sarmiento	Pennsylvania, University of
John Orlowski-Scherer	Pennsylvania, University of; McGill University
John Hughes	Rutgers, The State University of New Jersey
Ajay Gill	Toronto, University of
Matt Hilton	KwaZulu-Natal, University of; Witwatersrand, University of the
Bruce Partridge	Haverford College
Craig Sarazin	Virginia, University of
Jonathan Sievers	Toronto, University of; McGill University; Princeton University; KwaZulu-Natal, University of
Bradley Johnson	Virginia, University of
Adam Hincks	Toronto, University of
Mark Devlin	Pennsylvania, University of
Sankalp Choudhuri	European Southern Observatory; München, Technische Universität; Indian Institute of Science Education and Research, Pune
Nicholas Battaglia	Cornell University; Toronto, University of

* indicates the PI