Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..111s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 111-118.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Photometry, Galactic Structure, Mass To Light Ratios, Spiral Galaxies, Galactic Evolution, Transparence
Scientific paper
Surface photometry of 17 inclined Sa-Sb galaxies with prominent bulges from the ESO-LV Data Base has been analyzed with the aim of detecting the possible effects of a hypothetical absorbing layer bisecting the central bulge. Our method is based on looking for an asymmetry between the photometric profiles of the two semi-minor axes, and is complementary to the surface brightness inclination test which, for early spirals with bright bulges, is confused by the very presence of these bulges. None of the galaxies in our sample shows evidence of a continuous, near-opaque layer reaching the very center. Our conclusions are strengthened by two additional, well-studied objects, M 31 and M 104; our results indicate a lower obscuration in the central regions of early spirals with strong bulges compared to later types, and contribute to discriminate between competing models of light obscuration within galactic disks.
Morenas Vincent
Simien Francois
Valentijn Edwin. A.
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