Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331504p&link_type=abstract
American Astronomical Society, AAS Meeting #213, #315.04; Bulletin of the American Astronomical Society, Vol. 41, p.292
Other
Scientific paper
We study the influence of local environment on the formation and evolution of galaxies in the z 0.8 galaxy cluster RX J0152.7-1357 (RXJ0152-13) and its outskirts. Simulations show that massive clusters like RXJ0152-13 will grow in mass by a factor of 2-3 by z=0 through accretion of infalling galaxies and groups of galaxies. Our goal is to understand the transformation process that changes these infalling galaxies into red, early-type cluster members. We used a low-dispersion prism in the IMACS spectrograph at Magellan to obtain low-resolution spectroscopy for large numbers of galaxies over a wide field (D 30') in order to identify members in the vicinity of the cluster. With a mass limited sample (M>4x1010 MSun), we examined the rest-frame colors of galaxies as a function of local projected galaxy density. We found that the high-density regions in the core of the cluster and in the infalling groups support a high fraction of red galaxies compared to the lower density regions, as others have found at lower redshift. Intermediate density regions also revealed an elevated fraction of red galaxies. We also studied the star formation rates (SFRs) of members using Spitzer MIPS 24µm flux as a tracer. Our initial results show a lack of star-forming galaxies in the core of the cluster and in the high-density regions of the groups in the outskirts, which is consistent with their red colors discussed above. These results suggest that many future cluster members are transformed into passively evolving, red, early-types in infalling groups and in the surrounding filamentary structure of the cluster.
Ford Holland
Franx Marijn
Holden Bradford P.
Illingworth Garth D.
Kelson Daniel
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