2008A&A...489.1091M


Query : 2008A&A...489.1091M

2008A&A...489.1091M - Astronomy and Astrophysics, volume 489, 1091-1105 (2008/10-3)

Young star clusters in interacting galaxies - NGC 1487 and NGC 4038/4039.

MENGEL S., LEHNERT M.D., THATTE N.A., VACCA W.D., WHITMORE B. and CHANDAR R.

Abstract (from CDS):

We estimate the dynamical masses of several young (≃10Myr) massive star clusters in two interacting galaxies, NGC 4038/4039 (``The Antennae'') and NGC 1487, under the assumption of virial equilibrium. These are compared with photometric mass estimates from K-band photometry assuming a standard Kroupa IMF. The clusters were selected to have near-infrared colours dominated by red supergiants, hence old enough to have survived the earliest phases of cluster evolution when the interstellar medium is rapidly swept out from the cluster, supported by there being no obvious Hα emission associated with the clusters. All but one of the Antennae clusters have dynamical and photometric mass estimates that are within a factor ≃2 of one another, implying both that standard IMFs provide a good approximation to the IMF of these clusters and that there is no significant extra-virial motion, as would be expected if they were rapidly dispersing. These results suggest that almost all of the Antennae clusters in our sample have survived the gas removal phase as bound or marginally bound objects. Two of the three NGC 1487 clusters studied here have Mdyn estimates that are significantly greater than the photometric mass estimates. At least one of these two clusters, and one in the Antennae, may be actively in the process of dissolving. The process of dissolution contributes a component of non-virial motion to the integrated velocity measurements, resulting in an estimated Mdyn that is too high relative to the amount of measured stellar light. The dissolution candidates in both galaxies are amongst the clusters with the lowest pressures/densities measured in our sample.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - galaxies: star clusters

Nomenclature: Fig.1, Table 1: [MLT2008] SN-N (Nos S1-1 to S1-5, S2-1 to S2-3), [MLT2008] 2000-N (No. 2000-1), [MLT2008] NGC 1487-N (Nos 1 to 3).

CDS comments: In Fig.13 NGC 4212-10 is a misprint for NGC 4214-10 (= [BHE2002] NGC 4214 10 in SIMBAD).

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME NGC 1042 Nuclear Star Cluster Cl* 02 40 23.6 -08 25 59           ~ 3 0
2 GSPC S301-D * 03 26 54.0 -39 50 38           ~ 16 0
3 [MLT2008] NGC 1487-3 Cl* 03 55 46.0 -42 22 01           ~ 4 0
4 [MLT2008] NGC 1487-1 Cl* 03 55 46.0 -42 22 01           ~ 5 0
5 [MLT2008] NGC 1487-2 Cl* 03 55 46.0 -42 22 01           ~ 4 0
6 NGC 1487 GiP 03 55 46.5 -42 22 01   12.28 11.68 11.74 11.02 ~ 104 0
7 NAME NGC 1569 CL* B Cl* 04 30 49.0 +64 50 53           ~ 72 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16394 1
9 [SWG2006] F Cl* 09 55 47.08 +69 40 42.3   17.61 16.50   14.94 ~ 61 0
10 MGG 11 Cl* 09 55 50.2 +69 40 45           ~ 69 0
11 MGG 9 Cl* 09 55 50.5 +69 40 45           ~ 24 0
12 [SWG2006] A1 Cl* 09 55 53.5 +69 40 49           ~ 31 0
13 [WS95] 405A Cl* 12 01 50.460 -18 52 13.89     17.0     ~ 20 0
14 [MLT2008] S2-2 Cl* 12 01 51.900 -18 52 27.94           ~ 4 0
15 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1310 1
16 [MLT2008] S2-3 Cl* 12 01 53.130 -18 52 25.63           ~ 5 0
17 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1639 0
18 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1150 1
19 [MLT2008] S1-5 Cl* 12 01 54.310 -18 51 56.86           ~ 5 0
20 [MLT2008] S1-4 Cl* 12 01 55.050 -18 52 14.67           ~ 1 0
21 [MLT2008] S1-1 Cl* 12 01 55.200 -18 52 18.35           ~ 4 0
22 [MLT2008] S1-2 Cl* 12 01 55.260 -18 52 20.04           ~ 4 0
23 [MLT2008] 2000-1 Cl* 12 01 55.290 -18 52 17.18           ~ 4 0
24 [WS95] 342 Cl* 12 01 55.430 -18 52 19.45     19.4     ~ 17 0
25 [MLT2008] S1-3 Cl* 12 01 55.490 -18 52 25.49           ~ 1 0
26 [MLT2008] S2-1 Cl* 12 01 55.540 -18 52 20.73           ~ 5 0
27 [BHE2002] NGC 4214 10 Cl* 12 15 37.22 +36 19 56.4           ~ 8 0
28 [BHE2002] NGC 4214 13 Cl* 12 15 38.16 +36 19 44.4           ~ 8 0
29 [ATA2011] 48 GlC 12 28 10.3100773008 +44 05 35.475763272 19.614 19.609 19.241   18.477 ~ 10 0
30 [GHG2001] 47 GlC 12 28 13.9522849608 +44 06 42.881267556 18.940 18.965 18.678   18.134 ~ 10 0
31 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4138 4
32 [L2004] n5236-805 Cl* 13 37 01.8406131168 -29 52 13.394492436   16.37 16.14     ~ 21 0
33 [L99] n5236-502 Cl* 13 37 06.12 -29 53 18.4     17.51     ~ 12 0
34 GSPC S279-F * 17 48 22.7 -45 25 45           ~ 29 0
35 [L2004] n6946-1447 Cl* 20 34 32.03 +60 08 14.7   15.71 15.7     ~ 24 0

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2022.11.30-15:01:57

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