Molecular Distribution in the Spiral Arm of M51

Abstract

Molecular line images of 13CO, C18O, CN, CS, CH3OH, and HNCO are obtained toward the spiral arm of M51 at a 7" times 6" resolution with the Combined Array for Research in Millimeter-wave Astronomy (CARMA). Distributions of the molecules averaged over a 300 pc scale are found to be almost similar to one another and to essentially trace the spiral arm. However, the principal component analysis shows a slight difference of distributions among molecular species particularly for CH3OH and HNCO. These two species do not correlate well with star-formation rate, implying that they are not enhanced by local star-formation activities but by galactic-scale phenomena such as spiral shocks. Furthermore, the distribution of HNCO and CH3OH are found to be slightly different, whose origin deserves further investigation. The present results provide us with an important clue to understanding the 300 pc scale chemical composition in the spiral arm and its relation to galactic-scale dynamics.

20 pages, 9 figures, 8 tables, accepted for publication in ApJ

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• Diverse nuclear star-forming activities in the heart of NGC 253 resolved with ten-pc scale ALMA images
• Chemistry of the High-Mass Protostellar Molecular Clump IRAS 16562-3959
• Dense molecular gas in the starburst nucleus of NGC 1808
• A CO isotopologue Line Atlas within the Whirlpool galaxy Survey (CLAWS)
• Molecular Distributions of the Protostellar Envelope and the Outflow of IRAS 15398-3359: Principal Component Analysis
• FERIA: Flat Envelope Model with Rotation and Infall under Angular Momentum Conservation
• Molecular Distributions of the Disk/Envelope System of L483: Principal Component Analysis for the Image Cube Data
• A 3 mm Spectral Line Survey toward the Barred Spiral Galaxy NGC 3627
• Molecular Gas Density Measured with H${}_2$CO and CS toward a Spiral Arm of M51