Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4502m&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #45.02; Bulletin of the American Astronomical Society, Vol. 34, p.714
Other
Scientific paper
Deep 1.4 GHz radio continuum imaging of Abell 2255 is presented. This cluster is among the better nearby candidates for rich cluster- cluster merger systems, with evidence including an elongated X-ray morphology, the presence of a radio halo, and substructure present in its galaxy distribution. Our radio observations reach an rms sensitivity of 40 microJansky per beam, enabling us to detect (at 5-sigma) star formation rates as low as 1.4 solar masses per year from the center of the cluster out to a radial distance of 3h75-1 Mpc. The radio data are complemented by optical imaging and a large spectroscopic database, allowing us to separate all galaxies brighter than MR=-20 into cluster members and foreground/background galaxies. The spectra are also used to associate the galaxies' radio emission with either star formation or AGN. By comparing Abell 2255 to other nearby clusters, we demonstrate an unusual amount of activity in this cluster. It appears that the merger strongly effects the evolution of cluster members, including both the powerful AGN and the optically-faint star-forming galaxies.
Miller Nancy A.
Owen Frazer N.
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