DETECTING STAR FORMATION IN BRIGHTEST CLUSTER GALAXIES WITH GALEX

Journal Article · Fri Aug 20 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/719/2/1844· OSTI ID:21457036

Hicks, A K; Donahue, M ^[1]; Mushotzky, R ^[2]

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1. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320 (United States)
2. Goddard Space Flight Center, Code 662, Greenbelt, MD, 20771 (United States)

We present the results of GALEX observations of 17 cool core (CC) clusters of galaxies. We show that GALEX is easily capable of detecting star formation in brightest cluster galaxies (BCGs) out to z {>=} 0.45 and 50-100 kpc. In most of the CC clusters studied, we find significant UV luminosity excesses and colors that strongly suggest recent and/or current star formation. The BCGs are found to have blue UV colors in the center which become increasingly redder with radius, indicating that the UV signature of star formation is most easily detected in the central regions. Our findings show good agreement between UV star formation rates and estimates based on H{alpha} observations. IR observations coupled with our data indicate moderate-to-high dust attenuation. Comparisons between our UV results and the X-ray properties of our sample suggest clear correlations between UV excess, cluster entropy, and central cooling time, confirming that star formation is directly and incontrovertibly related to the cooling gas.

• OSTI ID: 21457036
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 719; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
ENTROPY
GALAXIES
GALAXY CLUSTERS
IONIZING RADIATIONS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
STARS
THERMODYNAMIC PROPERTIES
ULTRAVIOLET RADIATION
X RADIATION
X-RAY GALAXIES