2002A&A...385...21K

Query : 2002A&A...385...21K

2002A&A...385...21K - Astronomy and Astrophysics, volume 385, 21-31 (2002/4-1)

New distances to galaxies in the Centaurus A group.

KARACHENTSEV I.D., SHARINA M.E., DOLPHIN A.E., GREBEL E.K., GEISLER D., GUHATHAKURTA P., HODGE P.W., KARACHENTSEVA V.E., SARAJEDINI A. and SEITZER P.

Abstract (from CDS):

We present Hubble Space Telescope/WFPC2 images of seventeen dwarf galaxies in the Centaurus A group. Their distances derived from the magnitudes of the tip of the red giant branch are 5.2Mpc (KK112), 3.2Mpc (ESO 321-014), 3.5Mpc (KK179), 3.4Mpc (NGC 5102), 4.6Mpc (KK200), 3.7Mpc (ESO 324-024), 4.7Mpc (KK208), 4.6Mpc (ESO 444-084), 4.4Mpc (IC 4316), 4.5Mpc (NGC 5264), 3.6Mpc (KK211), 3.6Mpc (KK213), 3.4Mpc (ESO 325-011), 3.8Mpc (KK217), 4.0Mpc (KK221), 4.8Mpc (NGC 5408), and 3.6Mpc (PGC 51659). The galaxies are concentrated in two spatially separated groups around NGC 5128 = Cen A and NGC 5236 = M 83. The Cen A group itself has a mean distance of 3.63±0.07Mpc, a velocity dispersion of 89km/s, a mean projected radius of 263kpc, an estimated orbital mass of 2.1x1012M☉, and an orbital mass-to-blue luminosity ratio of 64M☉/L☉. For the M 83 group we derived a mean distance of 4.57±0.05Mpc, a velocity dispersion of 62km/s, a mean projected radius of 142kpc, an estimated orbital mass of 0.8x1012M☉, and Morb/LB=37M☉/L☉. The M 83 group moves away from the Cen A group, which yields a radius of the zero-velocity surface of the Cen A group of R0<1.26Mpc. The total mass within R0, M0<2.7x1012M☉, agrees with the orbital mass estimate. The centroids of both the groups have very small peculiar velocities, (+18±24)km/s (Cen A) and (-17±27)km/s (M 83) with respect to the local Hubble flow with H0=70km/s/Mpc.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: distances and redshifts - galaxies: general

CDS comments: Table 2 : HIPASSa=[K99b] HIPASS J1337-39, HIPASSb=[K99b] HIPASS J1351-47, HIPASSc=[K99b] HIPASS J1348-37.

Simbad objects: 75

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Number of rows : 75
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12639 1
2 NAME NGC 2403 Group GrG 07 36.9 +65 36           ~ 21 0
3 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4446 3
4 ESO 264-35 AG? 10 42 50.49 -47 37 03.5   14.05   13.00 13.9 ~ 18 0
5 ESO 215-9 AG? 10 57 29.90 -48 10 43.0   16.03   15.02 15.0 ~ 78 0
6 NGC 3621 Sy2 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 590 3
7 ESO 320-14 AG? 11 37 53.24 -39 13 13.2   15.85   15.17 16.0 ~ 45 0
8 ESO 379-7 AG? 11 54 43.49 -33 33 36.0   16.60   15.50 15.3 ~ 59 0
9 ESO 321-14 AG? 12 13 48.8792 -38 14 00.250 16.32 15.70 15.35 15.20 15.2 ~ 88 0
10 LEDA 2815819 G 12 44 21.5 -42 56 23   16.7       ~ 14 0
11 ESO 381-18 EmG 12 44 42.39 -35 58 00.2   15.79   14.84 15.1 ~ 56 0
12 ESO 381-20 AG? 12 46 00.67 -33 50 13.0   14.24   13.50 14.0 ~ 88 0
13 ESO 443-9 AG? 12 54 53.3144 -28 20 21.770   17.01   16.35   ~ 41 0
14 ESO 219-10 G 12 56 09.6 -50 08 38   16.96   15.36   ~ 23 0
15 ESO 269-37 AG? 13 03 33.1398 -46 35 10.765   16.29   14.95   ~ 47 1
16 LEDA 166152 AG? 13 05 02.8154 -40 04 58.706   16.0   16.2 16.0 ~ 60 0
17 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1474 2
18 ESO 269-58 AG? 13 10 32.8047 -46 59 37.747   12.50   11.31   ~ 72 0
19 LEDA 2815820 G 13 11 14.1 -38 54 22   17.3       ~ 16 0
20 LEDA 166158 G 13 12 45.2 -41 49 57   19.3       ~ 37 0
21 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 60 0
22 NGC 5068 AG? 13 18 54.807 -21 02 20.76 11.24 10.53 10.01 9.78 10.1 ~ 291 0
23 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
24 LEDA 166163 G 13 21 08.5 -31 31 50   17.4       ~ 56 0
25 LEDA 2815821 G 13 21 32.4 -31 53 11   17.6       ~ 20 0
26 LEDA 46663 AG? 13 21 47.40 -45 03 42.0           ~ 60 0
27 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 367 1
28 LEDA 46680 G 13 22 02.1 -42 32 10   16.6       ~ 57 0
29 LEDA 2815822 G 13 22 12.7 -42 43 41   18.5       ~ 38 0
30 LEDA 166164 G 13 22 56.2 -33 34 22   17.6       ~ 27 0
31 LEDA 46885 GiC 13 24 36.23 -30 58 18.5   16.67   17.33   ~ 57 1
32 LEDA 166166 G 13 25 12.0 -37 37 24           ~ 6 0
33 [KK98a] 132237.7-290039 G 13 25 24.8 -29 16 15           ~ 3 0
34 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4482 3
35 IC 4247 EmG 13 26 44.43 -30 21 44.7 15.34 14.67 14.28 14.13 14.53 ~ 89 0
36 LEDA 166167 G 13 27 27.8 -45 21 10           ~ 27 0
37 ESO 324-24 LSB 13 27 37.6117 -41 28 44.128   12.91   12.13 12.3 ~ 100 0
38 HIPASS J1328-30 G 13 28 26 -30 26.5           ~ 7 0
39 ESO 174-1 AG? 13 33 19.6893963648 -53 21 16.879051620   14.1       ~ 37 0
40 NGC 5206 GiG 13 33 43.9615937880 -48 09 03.953598228   11.62   10.40   ~ 109 0
41 ESO 444-78 GiC 13 36 30.7829 -29 14 10.181   15.49   14.81 15.0 ~ 89 0
42 LEDA 166170 G 13 36 35.5 -29 34 17   14.3       ~ 48 0
43 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2571 2
44 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 64 0
45 ESO 444-84 GiC 13 37 19.99 -28 02 42.0 16.04 15.34 15.05 15.05 14.9 ~ 121 1
46 LEDA 592761 G 13 37 25.2 -39 53 52   16.1   16.3 16.5 ~ 46 0
47 NGC 5237 EmG 13 37 39.056 -42 50 48.90   13.26 12.67 12.34   ~ 110 1
48 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1365 4
49 IC 4316 EmG 13 40 18.41 -28 53 32.0   15.02 15.93 14.15   ~ 83 0
50 ESO 445-7 AG? 13 40 21.3279 -31 42 07.684   16.65   16.5   ~ 30 1
51 NGC 5264 GiG 13 41 36.683 -29 54 47.25 13.86 12.96 12.39 12.14 15.83 ~ 152 1
52 LEDA 2815823 G 13 41 38.1 -42 34 55   18.1       ~ 28 0
53 LEDA 48515 G 13 42 05.7 -45 12 20   17.6       ~ 48 1
54 LEDA 166172 G 13 43 36.0 -43 46 11           ~ 31 1
55 ESO 325-11 AG? 13 45 01.0528 -41 51 45.993   14.02   13.49 12.9 ~ 106 0
56 LEDA 2815824 G 13 46 01.0 -36 19 41   17.1       ~ 23 0
57 LEDA 166175 G 13 46 16.8 -45 41 05   19.2       ~ 36 1
58 LEDA 166176 GiG 13 46 40.4 -29 58 41   19       ~ 23 0
59 ESO 174-1B G 13 47 58.088 -53 20 51.23   14.4   14.2 13.9 ~ 33 1
60 NAME Cen N G 13 48 09.2 -47 33 54           ~ 23 0
61 LEDA 4614882 AG? 13 48 33.9801 -37 58 03.811           ~ 35 0
62 LEDA 166179 G 13 48 46.4 -46 59 46           ~ 35 1
63 [KK98a] 134604.9-475721 G 13 49 10 -48 12.1           ~ 3 0
64 NAME TR 1346-35 EmG 13 49 17.5109711256 -36 03 48.860478360   11.00   10.11   ~ 111 1
65 LEDA 3097113 G 13 51 18.9 -46 58 25           ~ 34 0
66 [KK98a] 135301.2-452447 G 13 56 07.6 -45 39 27   15.73       ~ 5 0
67 ESO 384-16 AG? 13 57 01.37 -35 19 58.7   14.80   14.10 14.81 ~ 58 0
68 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 349 3
69 NAME Circinus Galaxy Sy2 14 13 09.906 -65 20 20.47   10.89 9.84 10.6 10.0 ~ 1214 2
70 LEDA 51659 G 14 28 03.7 -46 18 06   15       ~ 73 1
71 ESO 222-10 AG? 14 35 02.58 -49 25 14.3   14.8   14.6 14.7 ~ 36 0
72 ESO 272-25 AG? 14 43 25.52 -44 42 18.9   14.79   14.00 13.8 ~ 39 0
73 ESO 223-9 AG? 15 01 08.67 -48 17 25.7   12.3   12.5 12.6 ~ 78 0
74 ESO 274-1 G 15 14 13.429 -46 48 33.12   12.00   10.97 11.3 ~ 107 0
75 NAME Local Group GrG ~ ~           ~ 8385 0

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