%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 }