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Program Number
Program Name 2MASS Abell Cluster Survey                    
Margaret Geller [email]  [web]  
Co-Investigator(s) Massimo Ramella (Trieste), Hans Boehringer (MPE)


We request 5 nights to acquire complete redshift surveys (to 2MASS K = 13.2) within the virial regions of 13 Abell clusters of galaxies with redshift 0.05 < z < 0.62. By using the redshifts to obtain robust mass and K-band luminosity estimates to large radius, we plan to explore the scaling relations between x-ray and K-band cluster parameters. 2MACS, our total sample of 73 cleanly surveyed northern Abell clusters will enable further investigation of additional aspects of galaxy formation theories including : (1) variation in mass-to-light ratio with cluster mass and (2) change in the efficiency of galaxy formation with cluster mass (scaling of the dark matter halo occupation number with mass).
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Trimester(s) data taken 2005bc

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