We present a survey of 130 Galactic and extragalactic young massive clusters
(YMCs, $10^4 < M/< 10^8$, $10 < t/Myr < 1000$) with integrated
spectroscopy or resolved stellar photometry (40 presented here and 90 from the
literature) and use the sample to search for evidence of ongoing star-formation
within the clusters. Such episodes of secondary (or continuous) star-formation
are predicted by models that attempt to explain the observed chemical and
photometric anomalies observed in globular clusters as being due to the
formation of a second stellar population within an existing first population.
Additionally, studies that have claimed extended star-formation histories
within LMC/SMC intermediate age clusters (1-2 Gyr), also imply that many young
massive clusters should show ongoing star-formation. Based on visual inspection
of the spectra and/or the colour-magnitude diagrams, we do not find evidence
for ongoing star-formation within any of the clusters, and use this to place
constraints on the above models. Models of continuous star-formation within
clusters, lasting for hundreds of Myr, are ruled out at high significance
(unless stellar IMF variations are invoked). Models for the (nearly
instantaneous) formation of a secondary population within an existing first
generation are not favoured, but are not formally discounted due to the finite
sampling of age/mass-space.
Description
[1309.5092] Constraining Globular Cluster Formation Through Studies of Young Massive Clusters: I. A lack of ongoing star formation within young clusters
%0 Generic
%1 bastian2013constraining
%A Bastian, N.
%A Cabrera-Ziri, I.
%A Davies, B.
%A Larsen, S. S.
%D 2013
%K age cluster imf sfr
%T Constraining Globular Cluster Formation Through Studies of Young Massive
Clusters: I. A lack of ongoing star formation within young clusters
%U http://arxiv.org/abs/1309.5092
%X We present a survey of 130 Galactic and extragalactic young massive clusters
(YMCs, $10^4 < M/< 10^8$, $10 < t/Myr < 1000$) with integrated
spectroscopy or resolved stellar photometry (40 presented here and 90 from the
literature) and use the sample to search for evidence of ongoing star-formation
within the clusters. Such episodes of secondary (or continuous) star-formation
are predicted by models that attempt to explain the observed chemical and
photometric anomalies observed in globular clusters as being due to the
formation of a second stellar population within an existing first population.
Additionally, studies that have claimed extended star-formation histories
within LMC/SMC intermediate age clusters (1-2 Gyr), also imply that many young
massive clusters should show ongoing star-formation. Based on visual inspection
of the spectra and/or the colour-magnitude diagrams, we do not find evidence
for ongoing star-formation within any of the clusters, and use this to place
constraints on the above models. Models of continuous star-formation within
clusters, lasting for hundreds of Myr, are ruled out at high significance
(unless stellar IMF variations are invoked). Models for the (nearly
instantaneous) formation of a secondary population within an existing first
generation are not favoured, but are not formally discounted due to the finite
sampling of age/mass-space.
@misc{bastian2013constraining,
abstract = {We present a survey of 130 Galactic and extragalactic young massive clusters
(YMCs, $10^4 < M/\msun < 10^8$, $10 < t/{\rm Myr} < 1000$) with integrated
spectroscopy or resolved stellar photometry (40 presented here and 90 from the
literature) and use the sample to search for evidence of ongoing star-formation
within the clusters. Such episodes of secondary (or continuous) star-formation
are predicted by models that attempt to explain the observed chemical and
photometric anomalies observed in globular clusters as being due to the
formation of a second stellar population within an existing first population.
Additionally, studies that have claimed extended star-formation histories
within LMC/SMC intermediate age clusters (1-2 Gyr), also imply that many young
massive clusters should show ongoing star-formation. Based on visual inspection
of the spectra and/or the colour-magnitude diagrams, we do not find evidence
for ongoing star-formation within any of the clusters, and use this to place
constraints on the above models. Models of continuous star-formation within
clusters, lasting for hundreds of Myr, are ruled out at high significance
(unless stellar IMF variations are invoked). Models for the (nearly
instantaneous) formation of a secondary population within an existing first
generation are not favoured, but are not formally discounted due to the finite
sampling of age/mass-space.},
added-at = {2013-09-23T16:44:50.000+0200},
author = {Bastian, N. and Cabrera-Ziri, I. and Davies, B. and Larsen, S. S.},
biburl = {https://www.bibsonomy.org/bibtex/2fb40f1271cc8d0e01f58b218b20b8690/miki},
description = {[1309.5092] Constraining Globular Cluster Formation Through Studies of Young Massive Clusters: I. A lack of ongoing star formation within young clusters},
interhash = {ebed4fb2011cc079dc09786e05e215ae},
intrahash = {fb40f1271cc8d0e01f58b218b20b8690},
keywords = {age cluster imf sfr},
note = {cite arxiv:1309.5092Comment: 14 pages, 8 Figures, Accepted for publication in MNRAS},
timestamp = {2013-09-23T16:44:50.000+0200},
title = {Constraining Globular Cluster Formation Through Studies of Young Massive
Clusters: I. A lack of ongoing star formation within young clusters},
url = {http://arxiv.org/abs/1309.5092},
year = 2013
}