https://doi.org/10.1051/epjconf/202429300049
OLIMPO: A balloon-borne SZE imager to probe ICM dynamics and the WHIM
1 Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA
2 University of Michigan, 450 Church St., Ann Arbor, MI 48109, USA
3 NASA Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91011, USA
4 Physics Department, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
5 Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße 1, D-85748 Garching, Germany
6 University of Minnesota, 115 Union St. SE, Minneapolis, MN 55455, USA
7 Center for Astrophysics | Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA
8 Instituto di Fotonica e Nanotecnologie (IFN) - Consiglio Nazionale delle Ricerche (CNR) - Via del Fosso del Cavaliere 100, 00133 Rome, Italy
9 The University of Chicago, Chicago, IL 60637, USA
* e-mail: jack@caltech.edu
Published online: 28 March 2024
OLIMPO is a proposed Antarctic balloon-borne Sunyaev-Zel’dovich effect (SZE) imager to study gas dynamics associated with structure formation along with the properties of the warm-hot intergalactic medium (WHIM) residing in the connective filaments. During a 25 day flight OLIMPO will image a total of 10 z∼0.05 galaxy clusters and 8 bridges at 145, 250, 365, and 460 GHz at an angular resolution of 1.0′–3.3′. The maps will be significantly deeper than those planned from CMB-S4 and CCAT-P, and will have excellent fidelity to the large angular scales of our low-z targets, which are difficult to probe from the ground. In combination with X-ray data from eROSITA and XRISM we will transform our current static view of galaxy clusters into a full dynamic picture by measuring the internal intra-cluster medium (ICM) velocity structure with the kinematic SZE, X-ray spectroscopy, and the power spectrum of ICM fluctuations. Radio observations from ASKAP and MeerKAT will be used to better understand the connection between ICM turbulence and shocks with the relativistic plasma. Beyond the cluster boundary, we will combine thermal SZE maps from OLIMPO with X-ray imaging from eROSITA to measure the thermodynamics of the WHIM residing in filaments, providing a better understanding of its properties and its contribution to the total baryon budget.
© The Authors, published by EDP Sciences, 2024
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