2006MNRAS.369L...9B

Query : 2006MNRAS.369L...9B

2006MNRAS.369L...9B - Mon. Not. R. Astron. Soc., 369, L9-L13 (2006/June-2)

Evidence for the strong effect of gas removal on the internal dynamics of young stellar clusters.

BASTIAN N. and GOODWIN S.P.

Abstract (from CDS):

We present detailed luminosity profiles of the young massive clusters M82-F, NGC 1569-A and NGC 1705-1 which show significant departures from equilibrium (King and Elson, Fall & Freeman) profiles. We compare these profiles with those from N-body simulations of clusters that have undergone the rapid removal of a significant fraction of their mass as a result of gas expulsion. We show that the observations and simulations agree very well with each other, suggesting that these young clusters are undergoing violent relaxation and are also losing a significant fraction of their stellar mass.

That these clusters are not in equilibrium can explain the discrepant mass-to-light ratios observed in many young clusters with respect to simple stellar population models without resorting to non-standard initial stellar mass functions as claimed for M82-F and NGC 1705-1. We also discuss the effect of rapid gas removal on the complete disruption of a large fraction of young massive clusters (`infant mortality'). Finally, we note that even bound clusters may lose >50 per cent of their initial stellar mass as a result of rapid gas loss (`infant weight-loss').


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stellar dynamics - methods: {em N}-body simulations - galaxies: star clusters

CDS comments: Clusters: M82-F =[OM78] F, NGC 1569-A = [BDS2000] C4.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 106 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
5 [SWG2006] F Cl* 09 55 47.08 +69 40 42.3   17.61 16.50   14.94 ~ 62 0
6 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
7 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
8 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
9 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
10 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
11 NAME Local Group GrG ~ ~           ~ 9325 0

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