Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...44..441c&link_type=abstract
Astronomy and Astrophysics Supplement, Vol. 44, P. 441, 1981
Astronomy and Astrophysics
Astrophysics
26
Scientific paper
Two thousand ionized hydrogen radial velocity points have been measured over the optical extent of the southern spiral M 83 (NGC 5236), by means of a Fabry-Perot technique used at the Cassegrain focus of the ESO 3.60 m telescope. A spectrum taken in Haute-Provence yielded the velocities in the central nuclear region.
Internal and external errors in the observed velocities are briefly discussed. Mean values of the heliocentric radial velocities have been computed over two grids of square pixels, one having"low"spatial resolution (24" x 24"), the other having"high"spatial resolution (6" x 6"). The data are presented as maps of the velocity field and maps of isovelocities. he general appearance of the velocity field is compared with previous 21 cm and optical observations. The choice of the parameters to construct a rotation curve is also given.
Interpretation of the observational results will appear in a forthcoming paper.
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