The Clusters Hiding in Plain Sight (CHiPS) survey: A first discovery of a massive nearby cluster around PKS1353-341
T. Somboonpanyakul, M. McDonald, H. W. Lin, B. Stalder, and A. Stark

TL;DR
The CHiPS survey discovered a massive, nearby galaxy cluster with a cool core and active central black hole, highlighting the potential to find overlooked clusters in existing survey data.
Contribution
This paper presents the first discovery from the CHiPS survey, revealing a massive nearby cluster misclassified in previous surveys and demonstrating the survey's effectiveness.
Findings
The cluster is a strong cool-core with a relaxed X-ray morphology.
The central black hole is accreting at ~0.1% of Eddington rate.
The cluster's properties suggest it was missed or misidentified in past surveys.
Abstract
We introduce the first result of the Clusters Hiding in Plain Sight (CHiPS) survey, which aims to discover new, nearby, and massive galaxy clusters that were incorrectly identified as isolated point sources in the ROSAT All-Sky Survey. We present a Chandra X-ray observation of our first newly discovered low-redshift (z = 0.223) galaxy cluster with a central X-ray bright point source, PKS1353-341. After removing the point source contribution to the cluster core (L_nuc ~ 1.8x10^44 erg/s), we determine various properties of the cluster. The presence of a relaxed X-ray morphology, a central temperature drop, and a central cooling time around 400 Myr indicates that it is a strong cool-core cluster. The central galaxy appears to be forming stars at the rate of 6.2+\-3.6 Msun/yr, corresponding to ~1% of the classical cooling prediction. The supermassive black hole in the central galaxy appear…
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