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Astron. Astrophys. 325, 923-932 (1997)

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The extended CO J=1-0 emission in NGC 253

S. Houghton 1, J.B. Whiteoak 2, B. Koribalski 2, R. Booth 3, T. Wiklind 3 and R. Wielebinski 4

1 Department of Astrophysics & Optics, School of Physics, University of New South Wales, Sydney NSW 2052, Australia
2 Australia Telescope National Facility, PO Box 76, Epping NSW 2121, Australia
3 Onsala Space Observatory, S-43992, Onsala, Sweden
4 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 10 January 1997 / Accepted 11 March 1997

Abstract

The distribution of 12 CO(1-0) has been mapped over the spiral galaxy NGC 253 using the Swedish-ESO Submillimetre Telescope (SEST). Emission was found to extend 22.4 arcmin along the major axis and to be concentrated towards the nucleus with an LSR systemic velocity of 235 km s-1. The CO intensity and velocity distribution suggests three subsystems: a dense, highly-rotating nuclear cloud, a disk (with a line of nodes at a position angle of [FORMULA]) extending 150 arcsec each side of the nucleus containing a bar or spiral arms that are located at an azimuth of [FORMULA], and an outer disk with a position angle of [FORMULA]. The total gas mass derived for the full extent is [FORMULA], about 2% of the calculated dynamic mass of [FORMULA].

Key words: galaxies: individual: NGC 253-galaxies: kinematics and dynamics-radio lines: ISM

Send offprint requests to: sjh@wodin.phys.unsw.edu.au

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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