Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..394l&link_type=abstract
NOAO Proposal ID #1999A-0394
Other
Scientific paper
We propose to measure the distances and peculiar velocities of 9 early-type galaxies in the Centaurus cluster using infrared surface brightness fluctuations (SBFs). This region is one of the most puzzling and controversial in the local Universe. Centaurus has a dramatic bimodal velocity distribution (Cen30 and Cen45), and previous studies have found very large (1000-2000 km/s) non-Hubble outflow motions, suggesting a very massive system farther away, dubbed the Great Attractor. IR SBFs are very bright and red, allowing wig> 3× more accurate distances than past work. The seeing improvements from the CTIO 4-m tip-tilt system provide us with the sub-arcsecond images we need to identify and excise globular clusters, which would otherwise bias SBF distances. Our on-going CTIO program on nearby Fornax cluster galaxies will provide the SBF calibration for this study. Centaurus is the ideal region for this work as it is relatively close ( 30- 40 Mpc), and the flows are expected to be large. We have two goals: (1) to measure galaxy distances to verify the reality and amplitude of the outflows, and (2) to probe the velocity structure in Cen30 and Cen45 to determine their physical relationship.
Davis Martin
Graham James R.
Liu Michael C.
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