1997A&A...327..952S

Query : 1997A&A...327..952S

1997A&A...327..952S - Astronomy and Astrophysics, volume 327, 952-962 (1997/11-3)

Velocity structure of the dwarf galaxy population in the Centaurus cluster.

STEIN P., JERJEN H. and FEDERSPIEL M.

Abstract (from CDS):

Based on the photometric survey of the inner region of the Centaurus cluster (Jerjen & Dressler, 1997A&AS..124....1J) we measured redshifts for a deep, surface brightness limited sample of galaxies using the MEFOS multifibre spectrograph at the ESO 3.6m telescope. With the new data set radial velocities for 120 centrally located cluster members become available which is equivalent to 78% of all known cluster galaxies in the region brighter than BT=18.5. The relevant aspect of this investigation is that new redshifts for 32 dwarf galaxies have been measured, rising the total number to 48. We investigate the prominent bimodal velocity distribution of Centaurus in more detail, discussing the very different characteristics of the velocity distributions for the main Hubble types E&S0, spirals, Im&BCD, and dE&dS0. The nucleated, bright dwarf ellipticals are the only galaxies with a Gaussian-like distribution centred at 3148±98km/s. The remarkable coincidence of this velocity with the mean velocity of Cen 30 and the redshift of NGC 4696 in particular strongly suggests a connection of the dE&dS0s to the gravitational centre of the Centaurus cluster and/or to the cluster dominant E galaxy. The application of statistical tests reveals the existence of a population dwarf galaxies bound to NGC 4696. The dynamical parameters for the two velocity components suggest that Cen 30 is the real Centaurus cluster whereas Cen 45 can only be a loosely bound group of galaxies. This conclusion is followed up with a type-mixture analysis. All results are fully consistent with the cluster-group scenario. Whether Cen 45 is merging with the cluster or is located in the close background remains unclear. We show that the poorness of Cen 45 represents an intrinsic problem which makes it difficult to approach this question.

Abstract Copyright: ∼

Journal keyword(s): clusters of galaxies: general: Centaurus cluster - evolution of - galaxies: redshifts - evolution - NGC 4696

VizieR on-line data: <Available at CDS (J/A+A/327/952): tables5>

Nomenclature: Tables 5a, 5b, 5c: [SJF97] NNN (Nos 1-115)

Simbad objects: 119

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Number of rows : 119
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 2MASX J12473016-4139030 GiC 12 47 30.165 -41 39 03.04     16.23     ~ 6 0
2 2MASX J12473172-4115440 GiC 12 47 31.7071643112 -41 15 43.219984896           ~ 2 0
3 LEDA 43175 GiC 12 47 33.42 -41 07 54.7     15.94     ~ 6 0
4 NGC 4683 GiG 12 47 42.3423015120 -41 31 41.683104228   14.02 13.80 12.41   ~ 39 0
5 LEDA 578530 GiC 12 47 45.04728 -41 09 21.2904     16.52     ~ 7 0
6 LEDA 577864 GiC 12 47 46.48 -41 13 07.0           ~ 3 0
7 2MASX J12474922-4059548 GiC 12 47 49.2270250056 -40 59 54.790948284     15.85     ~ 6 0
8 6dFGS gJ124756.0-405514 GiC 12 47 56.034 -40 55 13.88   15.47 14.52 14.75   ~ 12 0
9 2MASX J12475956-4113108 GiC 12 47 59.5761120264 -41 13 11.115797484   16 14.78 14.95   ~ 15 0
10 LEDA 141508 GiC 12 48 02.07600 -41 18 19.2636     16.73     ~ 10 0
11 ESO 322-85 EmG 12 48 02.106 -40 35 39.89   15.23   14.45   ~ 28 0
12 6dFGS gJ124804.5-411252 GiC 12 48 04.56 -41 12 51.7   15.3   15.58 15.0 ~ 12 0
13 2MASX J12480861-4151478 GiC 12 48 08.617 -41 51 47.85           ~ 6 0
14 LEDA 43232 GiC 12 48 11.30 -40 32 29.6           ~ 3 0
15 [CM2006] J124815.45-414257.20 GiC 12 48 15.45 -41 42 57.2     16.97     ~ 5 0
16 LEDA 2798830 GiC 12 48 15.82 -41 18 57.7     17.84     ~ 5 0
17 ESO 322-88 GiG 12 48 21.5323216224 -41 42 51.752880828   14.02   12.29   ~ 42 0
18 ESO 322-89 GiG 12 48 22.7775410808 -41 07 23.263357332   14.97 13.90 13.70   ~ 34 0
19 LEDA 2798832 GiC 12 48 22.83 -41 41 52.4           ~ 3 0
20 2MASX J12483106-4118226 GiC 12 48 31.0290529632 -41 18 23.192553744   16 15.13 15.17   ~ 29 0
21 LEDA 2798838 GiC 12 48 34.99 -41 43 51.3           ~ 3 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 2MASX J12484344-4138376 GiG 12 48 43.4426747112 -41 38 37.252045968   15 14.05 14.07   ~ 21 0
25 NGC 4696 BiC 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 490 3
26 NAME Cen 30 ClG 12 48 51.7 -41 18 21           ~ 62 0
27 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1068 2
28 LEDA 43301 GiC 12 48 53.91 -41 19 05.8   16       ~ 19 0
29 ESO 322-92 GiG 12 48 55.1788071624 -40 34 54.833513700   14.51   13.24   ~ 24 0
30 LEDA 43315 GiC 12 49 00.24 -40 58 21.3           ~ 5 0
31 LEDA 2798847 GiC 12 49 00.87 -41 25 42.9     17.76     ~ 4 0
32 LEDA 577429 GiC 12 49 02.00 -41 15 33.3     17.39     ~ 12 0
33 6dFGS gJ124903.2-412330 GiC 12 49 03.164 -41 23 29.38   16.90 15.49 15.56   ~ 8 0
34 ESO 322-93 GiC 12 49 04.149 -41 20 20.39   16.11 14.51 15.16   ~ 24 0
35 ESO 322-94 GiG 12 49 06.4149391080 -41 49 56.408659500   14.76   13.12   ~ 23 0
36 2MASX J12490965-4111334 GiC 12 49 09.6591085440 -41 11 33.501499080     16.43     ~ 8 0
37 ESO 322-96 GiC 12 49 12.0508524048 -41 32 40.514640828   15.02 14.33 13.61   ~ 23 0
38 LEDA 2798854 GiC 12 49 14.16 -41 43 54.7           ~ 4 0
39 2MASX J12491862-4120073 GiC 12 49 18.622 -41 20 07.38   15 15.28 15.44   ~ 28 0
40 LEDA 2798856 GiC 12 49 22.69 -41 15 18.5     18.17     ~ 7 0
41 LEDA 43349 GiC 12 49 24.14 -40 38 11.5           ~ 3 0
42 2MASX J12492547-4125453 GiC 12 49 25.4220937128 -41 25 45.689719152   16.45 15.67     ~ 13 0
43 ESO 322-99 GiG 12 49 26.3301409104 -41 29 21.627075444   14.47 13.37 12.88   ~ 39 0
44 LEDA 575837 GiC 12 49 30.20 -41 25 15.7     17.63     ~ 8 0
45 MCG-07-26-053 GiG 12 49 33.0717670032 -41 54 01.083675276   14.48   13.11   ~ 18 0
46 ESO 322-101 GiG 12 49 34.5491608320 -41 03 17.352200448   14.42   12.98   ~ 43 0
47 ESO 322-102 GiG 12 49 37.8470834256 -41 23 17.829780396   14.60 13.72 13.03   ~ 45 0
48 2MASX J12493841-4105176 GiC 12 49 38.3932732680 -41 05 17.665603800           ~ 9 0
49 LEDA 2798864 GiC 12 49 39.20 -41 48 34.3           ~ 5 0
50 LEDA 43379 GiC 12 49 40.14 -41 21 58.3   17.09 16.01     ~ 13 0
51 2MASX J12494194-4113446 GiC 12 49 41.9793385128 -41 13 45.114262464     16.17     ~ 11 0
52 6dFGS gJ124942.0-404107 GiC 12 49 42.1001689032 -40 41 06.723781116   16   16.41   ~ 11 0
53 LEDA 43402 EmG 12 49 51.5885874864 -41 13 34.479036048   14 13.69 13.54   ~ 36 0
54 LEDA 43405 GiC 12 49 52.64 -40 50 50.1           ~ 5 0
55 LEDA 576636 GiC 12 49 54.09 -41 20 21.6           ~ 12 0
56 NGC 4706 EmG 12 49 54.1736893440 -41 16 45.678055692   14.00 13.50 12.39   ~ 63 0
57 LEDA 576005 GiC 12 49 56.00 -41 24 04.4     17.33     ~ 13 0
58 LEDA 43412 GiC 12 49 56.31 -41 15 37.1   17.20 16.20     ~ 12 0
59 NAME Cen 45 GrG 12 50 -41.3           ~ 47 0
60 LEDA 572747 GiC 12 50 00.85 -41 43 26.0     16.79     ~ 5 0
61 LEDA 2798873 GiC 12 50 01.33 -41 26 50.9           ~ 3 0
62 NGC 4709 Sy2 12 50 03.9037103928 -41 22 55.094298420   12.48 11.32 10.89   ~ 128 0
63 MCG-07-26-057 GiC 12 50 07.74 -41 23 52.8   14       ~ 25 0
64 2MASX J12501152-4113155 GiG 12 50 11.5502329872 -41 13 15.533494716   14 14.12 14.39   ~ 31 0
65 ESO 323-5 GiG 12 50 12.243 -41 30 52.59   13.99 13.01 12.46   ~ 36 0
66 LEDA 576994 GiC 12 50 17.44 -41 18 15.7           ~ 5 0
67 LEDA 573385 GiC 12 50 20.93 -41 39 53.1   17.89 16.92     ~ 6 0
68 ESO 323-7 GiG 12 50 24.1239159792 -40 50 38.643978336   14.05   12.68   ~ 21 0
69 LEDA 577062 GiC 12 50 24.33 -41 17 47.2   18.08 17.14     ~ 7 0
70 ESO 323-8 GiG 12 50 34.4089642800 -41 28 15.002563800   14.64 13.38 13.16   ~ 33 0
71 ESO 323-11 EmG 12 50 46.5884680224 -41 53 38.505336792   14.70       ~ 22 0
72 6dFGS gJ125057.2-405312 GiC 12 50 57.158 -40 53 11.76   16.43   15.05   ~ 4 0
73 6dFGS gJ125057.5-412348 GiC 12 50 57.4794008232 -41 23 47.496374844   15 14.34 14.51   ~ 23 0
74 LEDA 576226 GiC 12 50 58.35 -41 22 46.3           ~ 4 0
75 LEDA 575068 GiC 12 50 58.90 -41 29 40.2     17.39     ~ 6 0
76 LEDA 43506 EmG 12 51 00.9052764960 -41 43 20.858314656   14 13.37 13.82   ~ 29 0
77 2MASX J12511345-4048527 GiC 12 51 13.4219730168 -40 48 53.139199500           ~ 3 0
78 ESO 323-12 GiG 12 51 17.5903441488 -40 49 06.817981476   14.51   13.17   ~ 19 0
79 [CM2006] J125117.72-411634.10 GiC 12 51 17.98 -41 16 31.8     17.69     ~ 4 0
80 2MASX J12512764-4043291 GiC 12 51 27.6512681616 -40 43 29.355601152           ~ 3 0
81 6dFGS gJ125129.3-415038 GiC 12 51 29.304 -41 50 38.17   16   14.81   ~ 6 0
82 ESO 323-13 EmG 12 51 32.8930569624 -41 13 39.691731396   15.26 13.99 13.67   ~ 25 0
83 2MASX J12513636-4129321 GiC 12 51 36.3661322736 -41 29 32.501707728     15.13     ~ 4 0
84 2MASX J12513734-4118121 GiG 12 51 37.3211708592 -41 18 12.503837808   14 13.91 14.42   ~ 23 0
85 LEDA 43576 GiC 12 51 38.7 -41 10 28           ~ 3 0
86 LEDA 575199 GiC 12 51 39.78 -41 28 55.6     17.14     ~ 6 0
87 2MASX J12514603-4116001 GiC 12 51 46.0516878720 -41 16 00.487126056           ~ 5 0
88 6dFGS gJ125148.0-405937 GiC 12 51 47.9787164784 -40 59 37.239799488   15.87 14.68     ~ 12 0
89 6dFGS gJ125150.8-411111 GiC 12 51 50.8481725992 -41 11 10.447631880   16 15.23 15.24   ~ 15 0
90 LEDA 43597 GiC 12 51 51.33552 -41 25 56.2116     16.41     ~ 7 0
91 LEDA 572926 GiC 12 51 52.92 -41 42 28.2   18.33 17.33     ~ 6 0
92 LEDA 43604 EmG 12 51 56.4581614728 -41 32 20.551746120   15 13.86 14.09   ~ 26 0
93 LEDA 43609 GiC 12 52 00.2 -40 35 27           ~ 4 0
94 NGC 4730 GiG 12 52 00.5261265624 -41 08 48.955693308   13.90   12.25   ~ 37 0
95 LEDA 2798915 GiC 12 52 00.69 -41 08 34.1           ~ 4 0
96 ESO 323-18 GiG 12 52 01.1652997056 -41 16 46.315678656   14.84   13.39   ~ 27 0
97 LEDA 2798916 GiC 12 52 02.02 -41 25 09.1     16.97     ~ 5 0
98 ESO 323-19 GiG 12 52 03.2123675040 -41 27 35.566825392   14.10 13.89 12.45   ~ 37 0
99 LEDA 43626 GiC 12 52 04.44 -40 54 25.8           ~ 6 0
100 LEDA 573587 GiC 12 52 05.14 -41 38 39.0     17.02     ~ 4 0
101 ESO 323-20 EmG 12 52 12.9685206696 -41 20 19.994848656   15.01 14.34 13.79 14.1 ~ 22 0
102 2MASX J12521554-4128379 GiC 12 52 15.549 -41 28 37.92     15.49     ~ 6 0
103 6dFGS gJ125215.7-411534 GiC 12 52 15.7065212304 -41 15 33.594959268   16 14.62 14.74   ~ 14 0
104 NGC 4743 GiG 12 52 15.9997124832 -41 23 25.802293164   14.00 13.31 12.42   ~ 51 0
105 NGC 4744 GiG 12 52 19.603 -41 03 35.90   13.47 12.34 11.92   ~ 32 0
106 LEDA 572428 GiC 12 52 20.95 -41 45 06.8   18.15 17.24     ~ 6 0
107 LEDA 578408 GiC 12 52 21.52 -41 10 00.6     17.24     ~ 5 0
108 ESO 323-23 GiG 12 52 26.0085097968 -40 42 26.461706004   14.19   12.71   ~ 28 0
109 LEDA 577786 GiC 12 52 34.82 -41 13 33.6     17.40     ~ 6 0
110 2MASX J12524096-4113468 GiC 12 52 40.9329552360 -41 13 46.979049360   15 14.71 14.94   ~ 22 0
111 2MASX J12530532-4049292 GiC 12 53 05.3233590000 -40 49 29.644925124   16   15.41   ~ 7 0
112 LEDA 141515 GiC 12 53 14.07 -41 08 27.5     16.45     ~ 8 0
113 ESO 323-34 GiG 12 53 25.9275956592 -41 12 10.083784536   13.02   11.28   ~ 47 0
114 6dFGS gJ125342.4-410147 GiC 12 53 42.455 -41 01 46.60   16.71   15.52   ~ 10 0
115 2MASX J12540216-4123476 GiC 12 54 02.168 -41 23 47.69           ~ 5 0
116 6dFGS gJ125406.0-405404 GiC 12 54 06.0530585304 -40 54 03.594898044   15   15.02   ~ 12 0
117 CCC 284 EmG 12 54 28.9537589640 -41 09 30.591601128   16   14.94   ~ 5 0
118 2MASX J12545780-4059055 GiC 12 54 57.7515938400 -40 59 05.426247228   16.50   15.79   ~ 4 0
119 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 296 2

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