2002A&A...383..137M


Query : 2002A&A...383..137M

2002A&A...383..137M - Astronomy and Astrophysics, volume 383, 137-152 (2002/2-3)

Dynamical masses of young star clusters in NGC 4038/4039.

MENGEL S., LEHNERT M.D., THATTE N. and GENZEL R.

Abstract (from CDS):

In order to estimate the masses of the compact, young star clusters in the merging galaxy pair, NGC 4038/4039 (``the Antennae''), we have obtained medium and high resolution spectroscopy using ISAAC on VLT-UT1 and UVES on VLT-UT2 of five such clusters. The velocity dispersions were estimated using the stellar absorption features of CO at 2.29µm and metal absorption lines at around 8500Å, including lines of the Calcium Triplet. The size scales and light profiles were measured from HST images. From these data and assuming Virial equilibrium, we estimated the masses of five clusters. The resulting masses range from 6.5x105 to 4.7x106M. These masses are large, a factor of a few to more than 10 larger than the typical mass of a globular cluster in the Milky Way. The mass-to-light ratios for these clusters in the V- and K-bands in comparison with stellar synthesis models suggest that to first order the IMF slopes are approximately consistent with Salpeter for a mass range of 0.1 to 100M. However, the clusters show a significant range of possible IMF slopes or lower mass cut-offs and that these variations may correlate with the interstellar environment of the cluster. Comparison with the results of Fokker-Planck simulations of compact clusters with properties similar to the clusters studied here suggest that they are likely to be long-lived and may lose a substantial fraction of their total mass. This mass loss would make the star clusters obtain masses which are comparable to the typical mass of a globular cluster.

Abstract Copyright:

Journal keyword(s): galaxies: star clusters - galaxies: individual: NGC 4038/4039 - IMF - galaxies: clusters: general - stars: fondamental parameters

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 100 1
2 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1198 3
3 NGC 1705 SBG 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 618 1
4 V* TV Gem s*r 06 11 51.4142883048 +21 52 05.653085916 10.58 8.81 6.56 4.65 3.17 M0-M1.5Iab 166 0
5 BD+13 1212 Mi* 06 21 04.5092294952 +13 54 28.449659520 15.14 12.97 10.44 7.80 5.81 M3 25 0
6 HD 53177 * 07 04 00.0517847808 -04 37 24.616848144   9.40 7.45     K4III 12 0
7 [SWG2006] F Cl* 09 55 47.08 +69 40 42.3   17.61 16.50   14.94 ~ 61 0
8 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5616 6
9 * 23 Sex Pu* 10 21 02.0059724664 +02 17 22.997775480 5.9 6.547 6.644     B2IV/V 105 0
10 HD 91874 * 10 38 09.1592294088 +64 58 13.057836816   9.42 8.01 11.8   K4/5 11 0
11 HD 303250 s*r 10 44 20.0405801400 -58 03 53.454828060   10.79 8.691     M3Iab 26 0
12 HD 98817 s*r 11 21 38.9676062184 -60 59 28.225010868 12.41 10.44 8.30     M1Iab-Ib 42 0
13 V* V923 Cen s*r 11 51 42.9366511944 -61 09 30.386262060   10.04 7.90     M3Ia-Iab 35 0
14 [WS95] 405A Cl* 12 01 50.460 -18 52 13.89     17.0     ~ 20 0
15 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1304 1
16 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1631 0
17 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1148 1
18 [WS95] 342 Cl* 12 01 55.430 -18 52 19.45     19.4     ~ 17 0
19 * psi02 Lup SB* 15 42 41.0220569 -34 42 37.461720 4.08 4.576 4.721     B5V 107 0
20 * chi Her PM* 15 52 40.5410491705 +42 27 05.462878877 5.19 5.19 4.62 4.14 3.82 F8VFe-2Hdel-1 490 0
21 V* AP Nor V* 15 56 07.2397865760 -59 05 20.280390144   10.88 9.35     M4/6(I) 10 0
22 * c02 Sco SB* 16 12 18.2046168820 -27 55 34.953285603 3.66 4.413 4.568     B2V 173 0
23 CD-44 11324 * 16 58 57.5619342936 -44 24 04.773218976   11.68 9.38 7.20 5.50 M0Ib 9 0
24 HD 155603 sg* 17 14 27.6550817184 -39 45 59.937755508 11.17 8.69 6.44 4.60 3.36 K0_0-Ia 65 0
25 * sig Oph V* 17 26 30.8807335272 +04 08 25.293765444 7.39 5.82 4.31 3.22 2.46 K2II 172 0
26 V* BM Sco LP* 17 40 58.5463959480 -32 12 52.064356500 8.75 7.20 5.60     K2IbHdel1 77 0
27 HD 163755 * 17 59 05.281 -30 15 10.88   6.93 5.17     M1Ib 47 0
28 HD 167818 * 18 18 03.1913601 -27 02 33.514873   6.265 4.627     K3II 51 0
29 HD 170740 SB* 18 31 25.6939245072 -10 47 45.008376432 5.51 5.96 5.72     B2V+ 182 1
30 V* V450 Sct LP* 18 32 43.3227962 -14 51 56.383154   7.52 5.51     K3-Ib-IICN1 38 0
31 BD+00 4030 * 18 50 25.3569986184 +00 47 29.470367832 15.34 12.92 10.44 8.14 6.35 M2 12 0
32 HD 181475 V* 19 20 48.3121994424 -04 30 09.009698112   9.09 6.96     K7IIa 46 0
33 HD 183589 * 19 30 10.5351087360 +02 54 14.663673360   7.839 6.042     K5III 27 0
34 * b Sgr * 19 56 56.8316470 -27 10 11.640936   5.980 4.528     K2.5IIb 63 0
35 * 70 Aql * 20 36 43.6331948352 -02 32 59.836714368   6.475 4.880     K4+IIIBa1 75 0
36 [WS95] 355 Cl* ~ ~     22.1     ~ 7 0

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2022.08.09-03:18:09

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