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DTSTART;TZID=Australia/Sydney:20260729T150000
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DTSTAMP:20260722T020850Z
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UID:19541-1785337200-1785340800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Harshda Saxena (Caltech)
DESCRIPTION:A Multi-Wavelength Study of Cluster Cosmology and Astrophysics\n\nAbstract: \n\nGalaxy clusters are powerful probes of both cosmology and astrophysics\, tracing the growth of large-scale structure while providing a laboratory for studying the physics of the intracluster medium (ICM) and Active Galactic Nuclei (AGN). In this talk\, I will present my thesis work which uses multi-wavelength observations and simulations to characterize key astrophysics that affect cluster-based cosmological measurements. I will discuss how millimeter emission from cluster-member AGNs contaminates Sunyaev-Zel’dovich (SZ) cluster surveys\, including our recovery of two clusters in ACT maps using CARMA data. Building on this work\, I will present our plans for ongoing ATCA observations of millimeter-bright AGNs in the SPT-Deep field\, which will provide the first constraints on AGN-induced biases in a complete SZ-selected cluster sample. I will also discuss our previous work to quantify the impact of another astrophysical systematic\, cluster triaxiality\, on SZ selection\, which further leads to biases in weak-lensing mass estimates. To quantify the effect of this triaxiality\, our collaboration is developing a multi-probe framework that combines X-ray\, SZ\, and weak-lensing observations of clusters to constrain cluster geometry\, improve mass measurements\, and probe dark matter physics and mass accretion histories. In addition\, I will discuss ongoing work on cluster scaling relations using both observations and simulations\, with the goals of identifying low-scatter mass proxies and quantifying correlations between cluster observables. Finally\, I will present our work characterizing non-thermal pressure support in the ICM of clusters through combined SZ and X-ray fluctuation measurements\, representing the first such analysis using eROSITA and SZ data. \n\n \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-harshda-saxena-caltech/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
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