Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..527n&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 6, p. 527-538
Other
44
Carbon Monoxide, Galactic Structure, Interacting Galaxies, Line Spectra, Molecular Gases, Spiral Galaxies, Astronomical Maps, Optical Emission Spectroscopy, Spatial Distribution
Scientific paper
The (12)CO (J=1-0) line emission from the region of 6 min x 6 min (17 kpc x 17 kpc) of M51 has been mapped with the Nobeyama 45-m telescope. The mapping area covers most of the optical disk. The spiral arms are clearly separated, and the CO emission from the interarm regions is well detected with high sensitivity. Two molecular arms are fitted by symmetrical logarithmic spirals at 40 sec is less than R is less than 120 sec, but are distorted at R is greater than 120 sec by the tidal interaction with the companion galaxy NGC 5195, where R is the galactocentric distance. The width of the molecular arms is 900-1000 pc and its displacement from H alpha arms is 440 pc. The CO(2-1) to CO(1-0) intensity ratio is constant at 0.80 throughout the disk, except for the extreme outer region, and is almost the same as those previously measured in disks of other galaxies.
Handa Toshihiro
Kuno Nario
Nakai Naomasa
Sofue Yoshiaki
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