Deep GALEX Observations of the Coma Cluster: Source Catalog and Galaxy Counts
Derek Hammer, Ann Hornschemeier, Bahram Mobasher, Neal Miller, Russell, Smith, Stephane Arnouts, Bruno Milliard, and Leigh Jenkins

TL;DR
This paper presents a deep UV source catalog of the Coma cluster, combining advanced deblending techniques with traditional methods, revealing a significant excess in galaxy counts compared to previous measurements and providing insights into UV galaxy populations.
Contribution
It introduces a Bayesian deblending approach for UV source detection that doubles the number of sources and extends photometric depth beyond standard pipeline catalogs.
Findings
Approximately 9700 galaxies cataloged with UV and optical data.
Detected a ~50% excess in galaxy counts compared to previous UV surveys.
Bayesian deblending improves detection and photometry depth, reducing confusion issues.
Abstract
We present a source catalog from deep 26 ks GALEX observations of the Coma cluster in the far-UV (FUV; 1530 A) and near-UV (NUV; 2310 A) wavebands. The observed field is centered 0.9 deg (1.6 Mpc) south-west of the Coma core, and has full optical photometric coverage with SDSS. The catalog consists of 9700 galaxies with GALEX and SDSS photometry, including 242 spectroscopically-confirmed Coma member galaxies that range from giant spirals and elliptical galaxies to dwarf irregular and early-type galaxies. The full multi-wavelength catalog (cluster plus background galaxies) is ~80% complete to NUV=23 and FUV=23.5, and has a limiting depth at NUV=24.5 and FUV=25.0 which corresponds to a star formation rate of ~0.001 Msun/yr at the distance of Coma. Our deep GALEX observations required a two-fold approach to generating a source catalog: we used a Bayesian deblending algorithm to measure…
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