Tracing high density gas in M 82 and NGC 4038

Details Tracing high density gas in M 82 and NGC 4038 Tracing high density gas in M 82 and NGC 4038

2008-08-20

arxiv.org/abs/0808.2815v1

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, ApJ Letter - ACCEPTED

Scientific paper

10.1086/592399

We present the first detection of CS in the Antennae galaxies towards the NGC 4038 nucleus, as well as the first detections of two high-J (5-4 and 7-6) CS lines in the center of M 82. The CS(7-6) line in M 82 shows a profile that is surprisingly different to those of other low-J CS transitions we observed. This implies the presence of a separate, denser and warmer molecular gas component. The derived physical properties and the likely location of the CS(7-6) emission suggests an association with the supershell in the centre of M 82.

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