Ellipticals with kinematically distinct cores : HST imaging of the nuclear structure of IC 1459

Details Ellipticals with kinematically distinct cores : HST imaging of the nuclear structure of IC 1459 Ellipticals with kinematically distinct cores : HST imaging of the nuclear structure of IC 1459

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428l..49f&link_type=abstract

The Astrophysical Journal, vol. 428, no. 2, pt. 2, p. L49-L52

Other

13

Astronomical Models, Elliptical Galaxies, Galactic Structure, Images, Interplanetary Dust, Kinematics, Nuclear Structure, Polar Cusps, Stellar Cores, Visual Discrimination, Cameras, Data Reduction, Density Distribution, Extremely High Frequencies, Hubble Space Telescope, Irregularities, Nonequilibrium Conditions, Optical Filters, Photometry

Scientific paper

The elliptical galaxy IC 1459 has one of the strongest counter-rotating core components of any observed elliptical. Here we present Hubble Space Telescope (HST) Planetary Camera images of the center of IC 1459. Before deconvolution, our V band images reveal a bright point source at the galaxy nucleus, and dust near the nucleus. After removal of the central point source, deconvolution and model fitting, we show that the central starlight profile is better fit by a 'cusp' model than an isothermal core model. The photometric properties of the stellar light are comparable to those of other ellipticals without counter-rotating core components. There is an indication of a central stellar disk, although its detection is complicated by the extensive dust. Although the velocity field of the emission-line gas is ordered, the dust distribution is very irregular, and indicates nonequilibrium motions. The irregular dust distribution suggests that material is currently infalling and may be fueling the active nucleus. There is no direct evidence which relates the dust and gas to the peculiar stellar kinematics.

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