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Astron. Astrophys. 324, 899-903


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CO J = 2 1 observations of the nearby galaxies Dwingeloo 1
and Dwingeloo 2

R.P.J. Tilanus1,2 and W.B. Burton3

1Netherlands Foundation for Radio Astronomy, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands
2Joint Astronomy Centre, 660 N. A'ohoku Place, Hilo, Hawaii, 96720, USA
3Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands

Received 2 December 1996 / Accepted 24 February 1997

Abstract

We present an exploratory survey of the central regions of the nearby spiral galaxies Dwingeloo 1 and Dwingeloo 2 made in the CO J = 2 1 line at 230 GHz using the James Clerk Maxwell Telescope. In Dwingeloo 1, which is probably the nearest grand-design barred spiral, the CO emission was sampled along a cross with its major axis aligned with the bar. The CO emission is an order of magnitude weaker (peak Tmb FORMULA 70mK) than in its neighbours IC 342 and Maffei 2 and appears to be confined to the nucleus, bar, and spiral arms. In Dwingeloo 2, a small system quite likely to be a companion of Dw 1, a 3-sigma upper limit of 40 FORMULA for the CO J = 2 1 emission from the nucleus was obtained.

Key words: galaxies: individual: Dw 1 - galaxies: individual: Dw 2 - radio lines: galaxies

Send offprint requests to: R.P.J. Tilanus, Joint Astronomy Centre, Hilo


© European Southern Observatory (ESO) 1997

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