2007A&A...469..147R


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET23:48:32

2007A&A...469..147R - Astronomy and Astrophysics, volume 469, 147-162 (2007/7-1)

Bright globular clusters in NGC 5128: the missing link between young massive clusters and evolved massive objects.

REJKUBA M., DUBATH P., MINNITI D. and MEYLAN G.

Abstract (from CDS):

Globular clusters are the simplest stellar systems in which structural parameters are found to correlate with their masses and luminosities. To investigate whether the brightest globular clusters in the giant elliptical galaxies are similar to the less luminous globular clusters like those found in Local Group galaxies, we study the velocity dispersion and structural parameter correlations of a sample of bright globular clusters in the nearest giant elliptical galaxy NGC 5128 (Centaurus A). The UVES echelle spectrograph on the ESO Very Large Telescope (VLT) was used to obtain high-resolution spectra of 23 bright globular clusters in NGC 5128, and 10 clusters were observed with EMMI in echelle mode with the ESO New Technology Telescope. The two datasets have 5 clusters in common, while one cluster observed with UVES had too low a signal-to-noise ratio. Hence the total number of clusters analysed in this work is 27, more than doubling the previously known sample. Their spectra were cross-correlated with template spectra to measure the central velocity dispersion for each target. The structural parameters were either taken from the existing literature, or in cases where this was not available, we derived them from our VLT FORS1 images taken under excellent seeing conditions, using the ISHAPE software. The velocity dispersion and structural parameter measurements were used to obtain masses and mass-to-luminosity ratios (M/LV) for 22 clusters. The masses of the clusters in our sample range from Mvir=105-107M, and the average M/LV is 3±1. The three globular clusters harbouring X-ray point sources are the second, third, and sixth most massive in our sample. The most massive cluster, HCH99-18, is also the brightest and the largest. It has a mass (Mvir=1.4x107M) that is an order of magnitude higher than the most massive clusters in the Local Group and a high M/LV ratio (4.7±1.2). We briefly discuss possible formation scenarios for this object. The correlations of structural parameters, velocity dispersion, masses, and M/LV for the bright globular clusters in NGC 5128 extend the properties established for the most massive Local Group clusters towards those characteristic of dwarf elliptical nuclei and ultra-compact dwarf galaxies (UCDs). The detection of the mass-radius and the mass-M/LV relations for the globular clusters with masses higher than ∼2x106M provides the missing link between ``normal'' old globular clusters, young massive clusters, and evolved objects like UCDs.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 5128 - galaxies: star clusters

Nomenclature: Table 1: [HGH92] GNNN N=11 added among (Nos 1-44).

CDS comments: p.158, end of paragr.6.2: NGC 1613 is a misprint for NGC 1316.

Simbad objects: 70

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Number of rows : 70

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Mayall II GlC 00 32 46.53 +39 34 40.5   14.564 13.807 13.208 12.684 ~ 366 1
2 [MLV92] 237751 GlC 00 41 01.151 +41 13 45.41 16.040 15.400 14.17 13.560 12.570 ~ 79 0
3 Bol 37 GlC 00 41 34.97 +41 14 54.9 20.100 18.870 16.86 15.540 14.190 ~ 59 0
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10581 1
5 2E 166 GlC 00 44 29.5614604627 +41 21 35.695495111 15.50 15.000 14.220 13.679 13.02 ~ 124 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9107 1
7 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5026 1
8 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1408 1
9 NGC 1023 IG 02 40 24.012 +39 03 47.70 10.91 10.35 9.35 7.83   ~ 587 2
10 [FAB2017] NGC1023 UCD2 G 02 40 27.8301471917 +39 04 40.632363269   19.893 19.155 18.635   ~ 8 0
11 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1163 1
12 [GMK2001] 114 GlC 03 22 42.4375 -37 12 41.516   19.63 18.46     ~ 18 1
13 HD 33771 PM* 05 10 49.6205885556 -37 49 03.116571464   10.19 9.41     G6/8w(F) 36 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14346 1
15 CPD-23 2731 ** 07 44 17.7834816908 -23 54 31.964857579   10.46 10.35 10.41   ~ 10 1
16 NGC 2447 4 * 07 44 19.8869494839 -23 52 34.322193035   11.22 10.43     ~ 12 0
17 NGC 2447 OpC 07 44 30 -23 51.4           ~ 114 1
18 CD-23 6102 * 07 44 50.2512674466 -23 52 27.125664451   10.78 9.96     ~ 19 0
19 HD 66141 PM* 08 02 15.9365899 +02 20 04.452198 6.91 5.63 4.38 3.39 2.72 K2IIIbFe-0.5: 169 1
20 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 401 0
21 HD 83212 Pe* 09 36 19.9520860588 -20 53 14.744519420   9.582 9.177 7.83   G6/K0IIIwF7 117 0
22 HD 93529 Pe* 10 47 29.0134113275 -25 26 14.583999059   10.08 9.31 8.92   G6/8w 56 0
23 HD 103295 PM* 11 53 37.0223422254 -28 38 13.021084052   10.34 9.56     G5/6III 41 0
24 * c Vir PM* 12 20 20.9813348 +03 18 45.260365 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 331 0
25 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5662 0
26 [HGH92] G 41 GlC 13 24 38.98 -43 20 06.3           ~ 9 0
27 [HGH92] G 29 GlC 13 24 40.39 -43 18 05.2           ~ 11 0
28 [HGH92] G 11 GlC 13 24 54.73 -43 01 21.6           ~ 11 0
29 [HGH2004] 201.24254-42.93612 GlC 13 24 58.19 -42 56 10.3 19.34 18.73 17.71 17.10 16.44 ~ 26 0
30 [HGH92] G 12 GlC 13 25 05.720 -43 10 30.70   18.82 17.74 17.74   ~ 21 0
31 [R2001b] f2.GC-61 GlC 13 25 12.8699131968 -43 07 59.240462217 19.65 19.15 18.20 17.60 17.03 ~ 19 0
32 [VHH81] 5 GlC 13 25 16.12 -42 52 58.2 18.70 18.49 17.68 17.13 16.68 ~ 16 0
33 [HCH99] 2 GlC 13 25 16.690 -43 02 08.70 19.27 18.87 17.93 17.37 16.76 ~ 19 0
34 [HGH92] G 6 GlC 13 25 22.19 -43 02 45.6 18.65 18.17 17.21 16.61 16.03 ~ 23 0
35 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3896 3
36 [HCH99] 15 GlC 13 25 29.800 -43 00 07.00 19.27 18.87 17.93 17.37 16.76 ~ 17 0
37 [KKF2001] J132530.29-425934.64 GlC 13 25 30.290 -42 59 34.80   19.71 20.0 18.45   ~ 22 0
38 [R2001b] f2.GC-26 GlC 13 25 30.350 -43 11 48.40 20.11 19.56 18.56 17.94 17.35 ~ 18 0
39 [KKF2001] J132531.61-430003.06 GlC 13 25 31.600 -43 00 02.80 21.06 20.99 19.93 19.20 18.43 ~ 26 0
40 [R2001b] f2.GC-23 GlC 13 25 32.7820579360 -43 07 02.342413246 20.08 19.67 18.77 18.23 17.64 ~ 19 0
41 [VHH81] 153 GlC 13 25 34.650 -43 03 27.70     20.0 18.41   ~ 20 0
42 [HGH92] G 17 GlC 13 25 39.73 -42 55 59.1           ~ 11 0
43 [KKF2001] J132539.89-430502.04 GlC 13 25 39.86 -43 05 01.8 18.79 18.42 17.53 16.97 16.43 ~ 21 0
44 [HGH92] G 21 GlC 13 25 52.78 -43 05 46.3           ~ 11 0
45 [HGH92] G 22 GlC 13 25 53.56 -42 59 07.5           ~ 10 0
46 [HGH92] G 23 GlC 13 25 54.59 -42 59 20.9           ~ 10 0
47 [HGH92] G 7 GlC 13 26 05.38 -42 56 32.2           ~ 11 0
48 [HGH92] G 36 GlC 13 26 07.730 -42 52 00.30 19.42 19.19 18.35 17.81 17.33 ~ 24 0
49 [BBP2008] AAT123412 G 13 26 08.96 -42 53 42.4     19.44     ~ 8 0
50 [KKF2001] J132610.58-425342.78 GlC 13 26 10.580 -42 53 43.00 19.86 19.38 18.43 17.87 17.26 ~ 29 0
51 [R2001b] f1.GC-22 GlC 13 26 15.950 -42 55 00.50 19.02 18.78 18.02 17.58 17.14 ~ 8 0
52 [R2001b] f1.GC-23 GlC 13 26 23.7645637921 -42 54 01.053480688 19.67 19.30 18.41 17.87 17.32 ~ 16 0
53 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2920 0
54 * del Oph PM* 16 14 20.73853 -03 41 39.5612 6.30 4.34 2.75 1.46 0.43 M0.5III 341 0
55 * alf TrA * 16 48 39.89508 -69 01 39.7626   3.36 1.92     K2III_Ba1 227 0
56 * bet Oph PM* 17 43 28.3526482 +04 34 02.295484 5.150 3.930 2.750 1.96 1.38 K2IIICN0.5 448 0
57 V* V2564 Oph LP? 18 04 40.0713993238 +03 46 44.716089845 9.53 8.59 7.30 6.24 5.43 F6/7V 241 0
58 * del Sgr * 18 20 59.6435424 -29 49 41.165919   4.069 2.668     K2.5IIIaCN0.5 160 0
59 HD 171391 PM* 18 35 02.3914557925 -10 58 37.954413962   6.027 5.119     G8II/III 122 0
60 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1650 2
61 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 859 0
62 HD 176047 PM* 18 59 44.6462958104 -34 28 15.798541139   9.04 8.09     K0III 30 0
63 HD 196983 * 20 41 50.5030903512 -33 53 16.933849835   10.25 9.08     K1III 23 0
64 * 33 Cap PM* 21 24 09.5934291805 -20 51 06.735127671   6.535 5.366     K0III 102 0
65 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 47 0
66 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 656 1
67 [WSL93] 30 GlC 22 20 45.493 -24 40 49.36     19.39     ~ 15 0
68 NAME Local Group GrG ~ ~           ~ 6679 0
69 [HGH92] G 1 GlC ~ ~           ~ 7 0
70 [HGH92] G 44 GlC ~ ~           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2019.11.16-23:48:32

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