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Subarcsecond Resolution Mid-Infrared Observations of Super Star Clusters in the Antennae (NGC4038/4039)

In this letter we present ground-based subarcsecond mid-infrared imaging and spectroscopy of young super star clusters in the overlap region of the merging galaxies NGC4038/4039 (the Antennae) obtained with the VLT Imager and Spectrometer for mid-Infrared (VISIR). With its unprecedented spatial resolution VISIR begins to resolve the HII/PDR complexes around the star-forming regions for the first time. In the N-band spectra of two young star clusters unexpectedly low polycyclic aromatic hydrocarbon (PAH) emission is observed, compared to what is seen with the Infrared Space Observatory (ISO) and with the Spitzer Space Telescope. We conclude that a large fraction of the PAH emission cannot directly be associated with the super star clusters, but originate from an extended region of at least 215 pc radius around the clusters. In the distribution of [NeII] 12.81 micron emission a highly obscured cluster is discovered that does not have an optical or near-infrared counterpart.

preprint2006arXivOpen access
Leonie SnijdersPaul P. van der WerfBernhard R. BrandlSabine MengelDaniel SchaererZhong Wang
astro-ph
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Leonie SnijdersPaul P. van der WerfBernhard R. BrandlSabine MengelDaniel SchaererZhong Wang

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