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1998AJ....115..484B - Astron. J., 115, 484-501 (1998/February-0)
NGC 3081: surface photometry and kinematics of a classic resonance ring barred galaxy.
BUTA R. and PURCELL G.B.
Abstract (from CDS):
Near-infrared 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. Hα 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. There is bright emission in an oval zone in the inner 10" radius, but no enhancement of emission is associated with the blue-light nuclear ring. Since most of the emission is connected with the intrinsically oval inner ring and the bright center, the global dynamics of the galaxy are uncertain. Nevertheless, using a combination of the gravitational potential derived from the H-band light distribution and a simple halo model, we estimate the pattern speed and the location of all major resonances in the disk of NGC 3081. We find that NGC 3081 fits extremely well into recent ideas of barred galaxy dynamics.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Individual: NGC Number: NGC 3081 - Galaxies: Photometry - Galaxies: Structure
Simbad objects: 4
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