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Astron. Astrophys. 343, 367-372 (1999)

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A circumnuclear molecular torus in NGC 1365

SEST submillimetre observations of the J = 3 - 2 CO line

Aa. Sandqvist

Stockholm Observatory, SE-133 36 Saltsjöbaden, Sweden (aage@astro.su.se)

Received 19 October 1998 / Accepted 3 December 1998

Abstract

The central region of NGC 1365 has been mapped in the [FORMULA] CO emission line with the 15 m SEST, which has a HPBW of [FORMULA] at the frequency of this transition. The observing grid has a [FORMULA]-spacing in the inner and a [FORMULA]-spacing in the outer region. A deconvolved map has been produced using the Maximum Entropy Method (MEM). A circumnuclear molecular torus with a radius of about 6:005 is the dominant feature. Molecular emission is also seen coming from various dust streamers in the bar of the galaxy. Four new molecular species have been detected in NGC 1365, namely HCN, HCO+, H2CO and CS. 13CO has also been observed in the nuclear region.

Key words: radio lines: galaxies – galaxies: Seyfert – galaxies: nuclei – galaxies: ISM – galaxies: individual: NGC 1365

Send offprint requests to: Aage Sandqvist

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© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999
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