Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1336h&link_type=abstract
American Astronomical Society, HEAD meeting #9, #13.36; Bulletin of the American Astronomical Society, Vol. 38, p.372
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an archival study of galaxies in the nearest rich cluster, Coma, using ultraviolet (UV) and X-ray data from instruments onboard the XMM-Newton, Chandra, and Galaxy Evolution Explorer (GALEX) observatories. We report results on 27 Coma-member galaxies detected in the XMM Optical Monitor (OM) UVW2 band (λ 2100 Å), and find that UVW2-R color may serve as a proxy for star formation history in Coma, supporting similar results found in field galaxy studies using a combination of the GALEX and SDSS. We also include results from 20 Coma-member galaxies detected in the GALEX FUV and NUV filters at the cluster outskirts. There are 54 X-ray detected Coma members, 13 (25) of these galaxies have UVW2 (UVW1) counterparts. The X-ray/optical flux ratios are typically low, indicating they are mostly normal galaxies; we find that star-forming galaxies have higher X-ray/optical flux ratios than evolved galaxies. The small number of X-ray/UV detections does not permit strong constraints on e.g., X-ray - SFR correlations, though such techniques show great promise for future deeper and wider-field GALEX and X-ray studies of the Coma cluster. We gratefully acknowledge financial support through Chandra X-ray grant G05-5089X.
Bauer Florian
Bautz Marshall
Hammer Derek
Hornschemeier Ann
Kuntz Kip
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