The core of the nearby S0 galaxy NGC 7457 imaged with the HST planetary camera

Details The core of the nearby S0 galaxy NGC 7457 imaged with the HST planetary camera The core of the nearby S0 galaxy NGC 7457 imaged with the HST planetary camera

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369l..41l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 369, March 10, 1991, p. L41-L44.

Astronomy and Astrophysics

Astrophysics

64

Galactic Nuclei, Galactic Structure, Spiral Galaxies, Astronomical Photometry, Calibrating, Diffraction Limited Cameras, Hubble Space Telescope, Image Processing, Luminosity

Scientific paper

We have observed the nearby S0 galaxy NGC 7457 with the Planetary Camera of the Hubble Space Telescope. Spatial structure is observable at the the diffraction-limited resolution of the 2.4m HST primary despite the effects of spherical aberration. The central distribution of starlight appears consistent with a gamma ~-1.0 power law for r < 600 pc, plus a possible addtional stellar nucleus with L~1 x 10^7 Lsol (V band). We find no evidence of a core to limits r_c < 0.052" = 3.4 pc (Ho = 80 km/s/Mpc), in contrast to a priori estimiates of r_c ~ 30 pc based on total galaxy luminosity. The center of NGC 7457 remains unresolved at HST resolution and has a central luminosity density rho_0 > 3 x 10^4 Lsol pc^-3 (V band). This is now the second densest core known after M32. From the ground, NGC 7457 resembles any number of unresolved elliptical galaxies, which suggests that compact dense cores may be common. The images of NGC 7457 demonstrate the HST can still provide unique and astrophysically interesting information on the central structure of galaxies.

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