Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distance to the Centaurus cluster and its subcomponents from surface
  brightness fluctuations   We present I-band Surface Brightness Fluctuations (SBF) measurements for 15
early type galaxies (3 giants, 12 dwarfs) in the central region of the
Centaurus cluster, based on VLT FORS1 imaging data. From the SBF-distances to
our sample galaxies we determine the distance of the Centaurus cluster to be
41.3 +/- 2.1 Mpc (33.08 +/- 0.11 mag), about the same distance as of the
``Great Attractor''. We find a distance difference of 0.27 +/- 0.34 mag between
the two subcomponents Cen30 and Cen45, ruling out that both components are
separated by their Hubble flow distance. A distance difference of 0.48 +/- 0.21
mag is found between the central galaxies NGC 4696 (Cen30) and NGC 4709 (Cen45)
of both components, supported by the different turn-over magnitudes of their
respective globular cluster systems. This suggests that Cen45 is falling into
but has not yet reached Cen30, supporting the idea of a large scale filament
along the line of sight towards Centaurus (Churazov et al. 1999). H_0=83.0 +/-
8.3 km/s/Mpc is obtained for our Cen30 sample. This value corresponds to a much
smaller Hubble flow distortion in the direction of Centaurus than determined by
Tonry et al. (2000), implying that the GA mass estimate by Tonry et al. may be
too high and/or that the Centaurus cluster falls into the GA almost
perpendicularly to the line of sight. As our mean single measurement error is
very close to the measured distance scatter of the investigated galaxies, we
can only derive an upper limit of +/- 10 Mpc radial extension for the Centaurus
cluster. No evidence for an infall pattern into the Great Attractor is found
within the uncertainties for the 11 galaxies with measured redshift.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: cs