2005A&A...438..103M


Query : 2005A&A...438..103M

2005A&A...438..103M - Astronomy and Astrophysics, volume 438, 103-119 (2005/7-4)

The distance to Hydra and Centaurus from surface brightness fluctuations: Consequences for the Great Attractor model.

MIESKE S., HILKER M. and INFANTE L.

Abstract (from CDS):

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±1.4Mpc ((m-M)=33.07±0.07mag). Based on an improved correction for fluctuations from undetected point sources, we revise the SBF-distance to the Centaurus cluster from Mieske & Hilker (2003A&A...410..445M) upwards by 10% to 45.3±2.0Mpc ((m-M)=33.28±0.09mag). The relative distance modulus of the two clusters then is (m-M)Cen-(m-M)Hyd=0.21 ±0.11mag. With H0=72±4km/s/Mpc, we estimate a positive peculiar velocity of 1225±235km/s for Hydra and 210±295km/s for the Cen30 component of Centaurus. Allowing for a thermal velocity dispersion of 200km/s, this rules out a common peculiar flow velocity for both clusters at 98% confidence. We find that the 9x1015M ``Great Attractor'' at a distance of ≃45Mpc can explain the observed peculiar velocities if shifted about 15° 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.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Hydra cluster - cosmology: large scale structure of Universe - galaxies: kinematics and dynamics - galaxies: distances and redshift - techniques: photometric

CDS comments: Tables 2, 4: numbering 'NNN' is not used in SIMBAD (numbering of the line in the [CZ2003] catalogue).

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Great Attractor SCG 10 32 -46.0           ~ 548 0
2 NGC 3308 GiG 10 36 22.3394738568 -27 26 17.314025100   13.29 12.36 11.73 11.11 ~ 81 0
3 LEDA 755661 GiC 10 36 26.90 -27 23 25.6     17.19   16.15 ~ 13 0
4 NGC 3309 GiG 10 36 35.6607096792 -27 31 05.732321664   11.98 11.78 10.34 10.51 ~ 162 0
5 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 834 1
6 LEDA 141484 GiC 10 36 42.78 -27 35 09.6     16.51   15.43 ~ 13 0
7 NGC 3311 EmG 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 298 2
8 HCC 28 GiC 10 36 42.99 -27 25 29.5     18.10   16.98 ~ 6 0
9 HCC 27 GiC 10 36 45.70 -27 30 31.3     18.05   16.92 ~ 11 0
10 GALEX J103645.9-273126 GiC 10 36 45.85 -27 31 24.2     17.87   16.94 ~ 14 0
11 LEDA 141485 GiC 10 36 48.91 -27 30 01.5     17.77   16.68 ~ 16 0
12 LEDA 753828 GiC 10 36 50.20 -27 30 47.7     17.77   16.79 ~ 11 0
13 HCC 30 GiC 10 36 50.73 -27 23 01.2     18.36   17.48 ~ 6 0
14 LEDA 141487 GiC 10 36 52.58376 -27 32 15.2628     16.82   15.72 ~ 16 0
15 2MASX J10365705-2734041 GiC 10 36 57.0240013584 -27 34 04.344905424     16.40   15.20 ~ 16 0
16 HCC 29 GiC 10 37 00.20 -27 29 53.4     18.20   17.14 ~ 9 0
17 HCC 25 GiC 10 37 13.70 -27 30 25.2     17.87   16.76 ~ 7 0
18 HCC 21 GiC 10 37 17.30 -27 35 33.7     17.57   16.48 ~ 7 0
19 NGC 4373 GiG 12 25 17.8183715160 -39 45 35.245218672   11.59 11.05 10.09   ~ 115 1
20 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6591 0
21 LEDA 2798836 GiC 12 48 30.00 -41 19 19.3           ~ 7 0
22 LEDA 575633 GiC 12 48 36.06 -41 26 23.4     16.85     ~ 13 0
23 [CM2006] J124839.69-411605.60 GiC 12 48 39.72 -41 16 05.2   17.51 16.32     ~ 12 0
24 NGC 4696 BiC 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 489 3
25 NAME Cen 30 ClG 12 48 51.7 -41 18 21           ~ 62 0
26 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1055 2
27 LEDA 2798844 GiC 12 48 52.49 -41 32 25.0           ~ 6 0
28 LEDA 43301 GiC 12 48 53.91 -41 19 05.8   16       ~ 19 0
29 LEDA 577429 GiC 12 49 02.00 -41 15 33.3     17.39     ~ 12 0
30 2MASX J12491862-4120073 GiC 12 49 18.622 -41 20 07.38   15 15.28 15.44   ~ 28 0
31 LEDA 43379 GiC 12 49 40.14 -41 21 58.3   17.09 16.01     ~ 13 0
32 LEDA 2798867 GiC 12 49 46.54 -41 22 08.2           ~ 6 0
33 LEDA 576636 GiC 12 49 54.09 -41 20 21.6           ~ 12 0
34 LEDA 576005 GiC 12 49 56.00 -41 24 04.4     17.33     ~ 13 0
35 LEDA 2798871 GiC 12 49 56.19 -41 23 22.0           ~ 6 0
36 LEDA 43412 GiC 12 49 56.31 -41 15 37.1   17.20 16.20     ~ 12 0
37 NGC 4709 Sy2 12 50 03.9037103928 -41 22 55.094298420   12.48 11.32 10.89   ~ 127 0
38 NAME SHAPLEY-CENTAURUS CL SCG 13 06.0 -33 04           ~ 594 0
39 NAME Cen Hya Region reg ~ ~           ~ 7 0
40 NAME Local Group GrG ~ ~           ~ 8310 0

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