A high resolution hydrogen line survey of Messier 31. I Observations and data reduction

Details A high resolution hydrogen line survey of Messier 31. I Observations and data reduction A high resolution hydrogen line survey of Messier 31. I Observations and data reduction

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...55..179b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 55, Feb. 1984, p. 179-251. Research supported by the Netherl

Astronomy and Astrophysics

Astrophysics

117

Andromeda Galaxy, Astronomical Spectroscopy, Data Reduction, High Resolution, Hydrogen, Line Spectra, Angular Resolution, Astronomical Maps, Calibrating, Centimeter Waves, Fourier Transformation, Neutral Gases, Spectral Energy Distribution

Scientific paper

New observations with the Westerbork Synthesis Radio Telescope are presented of M31 in the 21 cm line of neutral atomic hydrogen. The observations and calibration are described, and the various stages of data reduction are covered, emphasizing the nonstandard reduction methods employed. Maps are presented in various formats, showing the data from different aspects in order to give a complete view of the whole data set. Radio photographs of the channel maps are shown at full resolution, and sets of position-velocity maps are presented at lower resolution. A radiophoto of the total H I surface brightness is also reproduced. The most striking features of the survey, such as the many regions which seem devoid of H I, are briefly discussed. Multiple peaks which occur at many positions of the observed line profile are probably caused by a warp.

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