Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...67..509d&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 67, no. 3, Feb. 1987, p. 509-539.
Astronomy and Astrophysics
Astrophysics
104
Galactic Structure, Hydrogen Atoms, Interstellar Gas, Neutral Gases, Spiral Galaxies, Astronomical Maps, Data Reduction
Scientific paper
Results are presented for a survey of the 21-cm line of H I in M33, carried out with the Westerbork Synthesis Radio Telescope at a resolution of 12 x 24 arcsec (ra x dec.), corresponding to about 40 x 40 pc in the plane of this galaxy, and at a velocity resolution of 8.2 km/s. The nonstandard reduction techniques are extensively described, especially those involving the addition of short-baseline information from Effelsberg 100-m observations and the extrapolation of these baselines using the method of Braun and Walterbos (1985). The survey is displayed in various formats as radio photographs with gray scales and contours in order to emphasize the continuity along all axes of the data cube. A short description of some of the most striking features in the channel maps is given. In addition to the fine-scale structure shown by filamentary and shell-like regions and by regions that seem devoid of H I emission, large-scale extended structures giving rise to double profiles can also be seen. The latter distributions are most probably caused by the warped outer H I layer. Anomalous velocities especially at the position of the optical spiral arms are also present.
Deul Erik R.
van der Hulst J. M.
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