Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114....7c&link_type=abstract
Astronomy and Astrophysics, vol. 114, no. 1, Oct. 1982, p. 7-18.
Astronomy and Astrophysics
Astrophysics
30
Galactic Structure, Spiral Galaxies, Astronomical Models, Flux (Rate), Galactic Rotation, H Alpha Line, H Ii Regions, Interferometry, Radial Velocity, Spatial Resolution, Stellar Luminosity, Velocity Distribution
Scientific paper
H-alpha narrowband observations are the basis of a study of ionized hydrogen in the large spiral galaxy NGC 1566 which has yielded a catalog of 418 H II regions covering the main body of the galaxy, supplemented by 59 positions and estimated H-alpha luminosities for regions located in the pseudo-outer ring where no H-alpha plate is available. A discussion of luminosity function, diameter distribution and spiral structure notes evidence for a double two-armed spiral pattern. The plane of the galaxy appears warped, and the efficiency of the two different spiral patterns in star formation is different. A preliminary radial velocity field is determined from three interferograms in H-alpha light, and is found to be acceptably fitted by a simple bulge-plus-disk dynamical model in which the apparent disk mass-to-light ratio sharply increases from center to edge.
Comte Georges
Duquennoy Antoine
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