Clusters of galaxies sample rare peaks in the primordial matter distribution and, because their evolution is sensitive to the underlying cosmology, accurate cluster mass measurements can place strong constraints on cosmological models. Using AXAF ACIS-I we will observe a sample of distant clusters (0.15TARGET SUMMARY
TARGET NAME
RA
DEC
TIME
SI
GRAT
TYPE
TC
ROLL
PRE
PHASE
MULTI
PRI
ABELL 2219
250.100000
46.710000
40.00000
ACIS-S
NONE
GO
no
no
no
no
no
5
IMAGES
(NOTE: RASS images currently only available for targets LTS scheduled on or after Apr-09-2000)