Tracing Star Formation in Cool Core Clusters with GALEX
Amalia Hicks, Richard F. Mushotzky, Megan Donahue
TL;DR
This study uses GALEX ultraviolet observations to investigate recent star formation in 16 galaxy clusters with cooling cores, revealing UV excesses indicative of young stars and analyzing their properties and correlations with cluster characteristics.
Contribution
It provides new insights into star formation activity in cooling core clusters through UV observations, linking UV excesses to cluster properties and recent star formation.
Findings
Most brightest cluster galaxies show UV excesses.
UV emission extent and colors correlate with cooling times.
Star formation rates align with cooling and luminosity indicators.
Abstract
We present recent results from a GALEX investigation of star formation in 16 cooling core clusters of galaxies, selected to span a broad range in both redshift and central cooling time. Initial results demonstrate clear UV excesses in most, but not all, brightest cluster galaxies in our sample. This UV excess is a direct indication of the presence of young massive stars and, therefore, recent star formation. We report on the physical extent of UV emission in these objects as well as their FUV-NUV colors, and compare GALEX inferred star formation rates to central cooling times, H-alpha and IR luminosities for our sample.
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