Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-29
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy and Astrophysics, Main Journal
Scientific paper
We present results of broad band {BVRI} observations of a sample of galaxies with a low surface brightness (LSB) disk and a bulge. These galaxies are well described as exponential disks and exponential bulges with no preferred value for either scale length or central surface brightness. The median {B} band disk scale length is 12.6 kpc (H_(0) = 75 km s^{-1} Mpc^{-1}) which is much larger than scale lengths of typical (disk dominated) LSB or high surface brightness (HSB) galaxies. Furthermore, the disk and bulge scale lengths are correlated, suggesting a coupling in the formation. Bulge dominated LSB galaxies are observed to be redder than disk dominated LSB galaxies and their bulge-to-disk ratios are increasing towards redder wavelengths. We find colors that are comparable to or bluer than HSB galaxies of the same morphological types. Bulge dominated LSB galaxies are therefore not faded HSB galaxies with no current star formation. We find that bulge dominated LSB galaxies fit in with the general trends defined by the HSB galaxies. The properties of these bulge dominated LSB galaxies show that LSB galaxies do not just come in two varieties. They cover the entire range in optical and morphological properties between late-type disk dominated LSBs and giant Malin-1-like LSBs. LSB galaxies thus also form a LSB Hubble sequence, parallel to the classical HSB one.
Beijersbergen Marco
de Blok J. G. W.
van der Hulst J. M.
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