Molecular gas in the bar at the center of NGC 253 has been imaged with 5" x 9" resolution in the CO emission line. The molecular bar has an angular extent of 39" x 12" and a mass in molecular clouds of 4.8 x 10^8^ M_sun_. The gas in the molecular bar appears to be rotating as a rigid body with a very steep rotation curve, indicating a large central mass concentration. Subject headings.: galaxies: individual (NGC 253) - galaxies: internal motions - galaxies: interstellar matter
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Canzian et al. (1988) studied this question.