Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171...66d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 66-76.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Models, Astronomical Photometry, Disk Galaxies, Galactic Evolution, Galactic Structure, Barred Galaxies, Brightness Distribution, Density Distribution, Spectral Energy Distribution, Spectrum Analysis, Spiral Galaxies
Scientific paper
Surface photometry of the edge-on SO galaxy NGC 1381, located in the core of the Fornax cluster, is presented. Examination of the brightness profiles parallel and perpendicular to the equatorial plane indicates that this galaxy has several distinct components, including a bar and an outer ring. In contrast to earlier expectations, no evidence is seen for a thick disk population and so it is argued that the overall box-shaped appearance of the galaxy is probably due to the projection of the outer ring onto the plane of the sky. Support for this model comes from the fact that the existence of an outer ring and a box-shaped nucleus are consistent with the results of the theoretical investigations on the dynamical evolution of barred galaxies. It is found that NGC 1381 has a low-luminosity disk similar to those found in other neighboring SO galaxies in the central regions of the Fornax cluster. This finding is in agreement with the hypothesis that the relations between disk-to-bulge luminosity ratio and galaxy density is due primarily to variations in the disk luminosity.
da Costa Luiz Nicolaci
de Carvalho Reinaldo R.
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