No Cluster Left Behind: Multiwavelength Cluster Analysis with All the Data
by
Tsung-Dao Lee Institute/S4F-SW - Open Area
Tsung-Dao Lee Institute
Host: Ying Zu
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Abstract:
Cluster abundance is among the most powerful cosmological probes, but its constraining power is currently limited by systematic uncertainties in mass calibration. Optically selected samples in particular suffer from line-of-sight projection effects that bias both richness and lensing measurements. Jointly modeling clusters observed across multiple wavelengths offers a path to self-calibrating these systematics — yet previous multiwavelength analyses have typically discarded clusters lacking tSZ or X-ray counterparts, sacrificing much of the sample's statistical power. In this talk, I will present an analysis framework that retains every cluster detected in at least one survey: no cluster left behind. Applying it to Dark Energy Survey and South Pole Telescope data, I will show joint constraints on cluster mass calibration and optical projection effects. I will conclude by looking forward to multiwavelength cluster cosmology in the era of Rubin, Roman, SPT-3G, and eROSITA.
Biography:
Conghao Zhou is a Ph.D. candidate in Physics at UC Santa Cruz. He is interested in galaxy cluster cosmology, low surface brightness photometry, stellar halo science, pixel-to-object pipelines, and dwarf galaxies. He is a member of the Rubin, DES, DESI, and Merian collaborations.
