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Date and Time of the Query: 2019-05-23 T09:54:30 PDT
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For refcode 2005A&A...438..103M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2005A&A...438..103M The distance to Hydra and Centaurus from surface brightness fluctuations: Consequences for the Great Attractor model S. Mieske, M. Hilker and L. Infante Received 2 July 2004 / Accepted 29 March 2005 We present I-band Surface Brightness Fluctuation (SBF) measurements for 16 early-type galaxies (3 giants, 13 dwarfs) in the central region of the Hydra cluster, based on deep photometric data in 7 fields obtained with VLT FORS1.From the SBF-distances to the galaxies in our sample we estimate the distance of the Hydra cluster to be 41.2 +/- 1.4 Mpc ((m-M)=33.07 +/- 0.07 mag). Based on an improved correction for fluctuations from undetected point sources, we revise the SBF-distance to the Centaurus cluster from Mieske & Hilker (2003, A&A, 410, 455) upwards by 10% to 45.3 +/- 2.0 Mpc ((m-M)=33.28 +/- 0.09 mag).The relative distance modulus of the two clusters then is (m-M)_Cen_-_(m-M)_Hyd_ = 0.21 +/- 0.11 mag. With H_0_= 72 +/- 4 km s^-1^ Mpc^-1^, we estimate a positive peculiar velocity of 1225 +/- 235 km s^-1^ for Hydra and 210 +/- 295 km s^-1^ for the Cen30 component of Centaurus. Allowing for a thermal velocity dispersion of 200 km s^-1^, this rules out a common peculiar flow velocity for both clusters at 98% confidence. We find that the 9 x 10^15^ M_sun_ "Great Attractor" at a distance of ~= 45 Mpc can explain the observed peculiar velocities if shifted about 15 deg towards the Hydra cluster position. Our results are inconsistent at 94% confidence with a scenario where the Centaurus cluster is identical to the GA. In order to better restrict partially degenerate Great Attractor parameters like its mass and distance, a recalculation of the local flow model with updated distance information over a larger area than covered by us would be needed. Keywords: galaxies: clusters: individual: Hydra cluster, cosmology: large, scale structure of Universe, galaxies: kinematics and dynamics, galaxies: distances and redshift, techniques: photometric
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