Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..497a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 497-508. Research supported by University of
Astronomy and Astrophysics
Astrophysics
48
Carbon Monoxide, Emission Spectra, Interstellar Matter, Spiral Galaxies, Astronomical Models, H Ii Regions, Interferometry
Scientific paper
The paper presents interferometer and combined single-dish interferometer maps of two fields in M51. The interferometer map recovers from 45 to 55 percent of the total single-dish flux intensity, while the combined map recovers most of the flux density. It is shown that the majority of the flux density recovered in the combined map lies in the spiral arm regions. While the peaks remain generally the same shape, size, and intensity, the arms become wider and more continuous when compared with the interferometer map. Arm widths of up to 1.3 kpc are seen, and the CO arms are clumped on a linear scale of about 1 kpc. Several clumps of interarm emission are detected in the combined map, but the majority of the interarm emission falls below the noise level of the map. Only 25 percent of the total CO flux density is found in the interarm regions. A summary of the properties derived from the combined map is presented.
Adler David S.
Allen Ronald J.
Lo Kwok Yung
Plante Raymond Louis
Rydbeck Gustav
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