Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..484b&link_type=abstract
Astronomical Journal, vol. 115, p. 484
Astronomy and Astrophysics
Astronomy
45
Galactic Structure, Astronomical Photometry, Resonance, Ring Galaxies, Morphology, H Alpha Line, Fabry-Perot Interferometers
Scientific paper
This paper presents a detailed photometric and kinematic study of the well-known Seyfert 2 galaxy NGC 3081, one of the best examples of a resonance ring barred galaxy in the sky. Improved optical images compared to previous studies reveal that NGC 3081 is a classic R1R'2 galaxy, a type that shows a distinctive outer ring/pseudoring pattern at large radii that can be linked to orbit families at the outer Lindblad resonance (OLR). Together with an exceptionally strong inner ring and a blue nuclear ring, NGC 3081 has the rare distinction of having all four of the main types of resonance rings that have been predicted by test-particle models of barred spirals. NIR imaging of NGC 3081 reveals clear old rings connected to the inner ring and the R1 outer ring. Objective comparison of the B- and H-band positions of the inner ring indicates no significant difference in shape, major-axis position angle, or major-axis radius between the two passbands, in spite of the different stellar populations each band emphasizes. Imaging Fabry-Perot interferometry provides an intriguing picture of star formation in the galaxy and of the dynamics of the system. H-alpha emission is strong in the inner ring and is confined to a bounded elliptical annulus of diffuse emission whose ellipticity increases from the inner edge to the outer edge. A few H II regions are connected to the strong R1-type outer ring, particularly just off the major axis of the inner ring where 'dimples', typical of the R1 morphology, are found.
Buta Ron
Purcell Guy B.
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