THE EXTENDED CO J=1-0 EMISSION IN NGC-253

The distribution of (CO)-C-12(1-0) has been mapped over the spiral gal axy NGC 253 using the Swedish-ESO Submillimetre Telescope (SEST). Emis sion was found to extend 22.4 arcmin along the major axis and to be co ncentrated towards the nucleus with an LSR systemic velocity of 235 km s(-1). The CO intensity and velocity distribution suggests three subs ystems: a dense, highly-rotating nuclear cloud, a disk (with a line of nodes at a position angle of 63 degrees) extending 150 arcsec each si de of the nucleus containing a bar or spiral arms that are located at an azimuth of 21 degrees, and an outer disk with a position angle of 5 2 degrees. The total gas mass derived for the full extent is 2.4 x 10( 9) M-circle dot, about 2% of the calculated dynamic mass of 10.5 x 10( 10) M-circle dot.