Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..308s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 685, p. 308-314.
Astronomy and Astrophysics
Astronomy
21
Galactic Nuclei, Galactic Structure, Pattern Recognition, Ring Galaxies, Charge Coupled Devices, Image Analysis, Star Formation Rate
Scientific paper
We propose a method of pattern recognition, called the R- and Theta-relief method, for studying fine structures in face-on galaxies, particularly in nuclear disks. This method enhances radial and azimuthal structures buried in a galactic disk. By applying the method to a B-band CCD image of face-on galaxy M51, we show that the nuclear disk is superposed by multiple rings and radial spoke structures. Amplitudes of B-band intensity of 100 pc scale structures are an order of magnitude greater in the central 1 kpc region than in the outer major arm regions, which indicates a much higher rate of star formation in the central regions than in arms.
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