Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117..778b&link_type=abstract
The Astronomical Journal, Volume 117, Issue 2, pp. 778-791.
Astronomy and Astrophysics
Astronomy
18
Galaxies: Individual: Alphanumeric: Ic 4214, Galaxies: Kinematics And Dynamics, Galaxies: Photometry, Galaxies: Structure
Scientific paper
The southern galaxy IC 4214 is a bright, nearby example of a multiple ring early-type spiral galaxy with a weak bar. The galaxy shows three strong pseudoring features, including a nuclear ring, an inner ring, and a prominent R^'_1 outer ring, each with distinctive characteristics. The galaxy is important because it is a classic resonance ring galaxy where the ring features can be linked to specific orbital resonances with the bar. We present in this paper a detailed UBVIH study of its photometric structure and a Fabry-Perot study of its kinematics to set the stage for a dynamical model in a separate paper. Despite the early Hubble type, ionized gas is well distributed in the inner disk regions, providing a well-sampled velocity field. Rapid rotation is found in the vicinity of the nuclear ring, where the rotation curve reaches a maximum, and the rotation velocities drop off somewhat with increasing radius in the outer regions. Noncircular motions are clearly seen in the observed velocity field. Analysis of both the velocity field and the shapes of isophotes give discrepant values for the inclination of the system, ranging from 47 deg to 50 deg from photometry to 55 deg to 58 deg from kinematics. A likely value of the inclination could be 52 deg if the inner and outer rings are intrinsically elongated and aligned perpendicular to each other.
Buta Ron
Cobb Melinda Lewis
Crocker Deborah A.
Purcell Guy B.
Rautiainen Pertti
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