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Astron. Astrophys. 324, 899-903 (1997)

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

R.P.J. Tilanus 1, 2 and W.B. Burton 3

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

Received 2 December 1996 / Accepted 24 February 1997


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 [FORMULA] 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 [FORMULA] [FORMULA] 70 mK) 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 [FORMULA] 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

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998