Volume 459, Number 2, November IV 2006
|Page(s)||441 - 451|
|Published online||12 September 2006|
NGC 2146's starburst region and extended structure
IRAM, 300 rue de la Piscine, 38406 St.-Martin-d'Hères, France e-mail: firstname.lastname@example.org
2 Astronomisches Institut der Universität Bonn, 71 Auf dem Hügel, 53121 Bonn, Germany
3 IRAM, Nucleo Central, 7 Avenida Divina Pastora, 18012 Granada, Spain
4 INAF – Instituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
5 INAF – Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy
Accepted: 26 July 2006
We present mm-wavelength and optical observations of the starburst region in NGC 2146. This region of ~4 kpc diameter contains a well-ordered distribution of stars, gas, and dust, and a well-ordered rotation. The possible anomalies found in our observation are a warped CO distribution and an increase in the CO line width at the NW edge of the starburst region. The investigation of a possible encounter or merger origin of the starburst may therefore have to concentrate on the distorted outer structure of the galaxy. There are three large-scale features of ~20 kpc extent, two of which give the impression of being stellar sub-systems. The third feature is an incomplete and expanding ring of H ii regions and stars, apparently indicating an event that occurred some 300 Myr ago.
Key words: galaxies: general / galaxies: starburst
© ESO, 2006
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