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Astron. Astrophys. 341, 697-708 (1999)

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Optical/near-IR surface photometry of blue low surface brightness galaxies

Nils Bergvall 1, Jari Rönnback 1, Josefa Masegosa 2 and Göran Östlin 1

1 Astronomiska observatoriet, Box 515, SE-75120 Uppsala, Sweden
2 Instituto de Astrofisica de Andalucia, CSIC, Apdo. 3004, E-18080 Granada, Spain

Received 16 February 1998 / Accepted 29 September 1998


We present luminosity profiles, colour profiles and disk parameters based on near-infrared JHK surface photometry of a sample of blue low surface brightness galaxies (BLSBGs). The results are discussed along with previously obtained optical data. We find that the morphological properties in optical and near-IR are quite similar. The luminosity profiles have exponential shapes modified by a small central bulge or, below [FORMULA]23 magnitudes arcsec-2, a trough. The blue LSBGs have scalelengths intermediate between normal LSB disks and gas rich dwarf galaxies. A correlation between scalelength and B-V colour is found for LSBGs in general. In comparison with normal late type disk galaxies our galaxies are bluer and smaller. At the same B scalelength, the two types differ in luminosity with 2 magnitudes, corresponding to a difference in mean star formation rate of a factor 5-10. Several photometric properties indicate that they contain very little dust and that, at the lowest surface brightnesses, the stellar population is homogeneous.

Key words: galaxies: fundamental parameters – galaxies: photometry – galaxies: spiral – galaxies: structure

Send offprint requests to: N. Bergvall (nils.bergvall@astro.uu.se)

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© European Southern Observatory (ESO) 1999

Online publication: December 16, 1998