MUSTANG2: High-resolution SZE Imaging Of Galaxy Clusters With The GBT

Details MUSTANG2: High-resolution SZE Imaging Of Galaxy Clusters With The GBT MUSTANG2: High-resolution SZE Imaging Of Galaxy Clusters With The GBT

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944608y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #446.08

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We present the next generation of the MUltiplexed SQUID/TES Array at Ninety GHz (MUSTANG2), a proposed 208-pixel feedhorn-coupled bolometer array for the 100m Green Bank Telescope. Utilizing the Sunyaev-Zel'dovich Effect (SZE) at 90 GHz, MUSTANG2 will produce high-resolution (9") images of the intra-cluster medium (ICM) in galaxy clusters, the largest gravitationally bound objects in the Universe. The SZE is a redshift-independent, complementary probe of the ICM to X-ray emission which diminishes with redshift and varies as the square of density. In deep (1 hour) observations MUSTANG2 can measure pressure profiles of high mass clusters out to and beyond the virial radius and down to substructure in the cluster core. In 15 hour observations, MUSTANG2 can do the same for low mass (M=7x1013Msolar) systems at z>.35. This is nearly a decade in mass below the current limits of SZE instruments such as ACT, SPT, and Planck. This broad angular and dynamic range is important for studying the low normalization to the cluster power spectrum found recently by ACT and SPT as well as the contribution of cluster outskirts to the integrated SZE flux.
SZE surveys have the potential to place tight constraints on cosmological parameters with cluster number counts but rely on accurate determination of the scaling between integrated SZE flux and cluster mass. Current SZE survey instruments cannot resolve features due to mergers and AGN feedback, which could introduce scatter and bias the SZE cluster selection function. MUSTANG2, however, can resolve these features and determine the extent to which the scaling relations have been biased by cluster astrophysical phenomena. With unprecedented sensitivity, nearly 25 times that of the current MUSTANG receiver, MUSTANG2 will map hundreds of clusters per season, which will unlock the full potential of galaxy clusters as cosmological probes.

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