Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-07
Astrophys.J.648:L25-L28,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, accepted for publication in ApJL
Scientific paper
10.1086/507424
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.
Brandl Bernhard R.
Mengel Sabine
Schaerer Daniel
Snijders Leonie
van der Werf Paul P.
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