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

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

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..697b&link_type=abstract

Astronomy and Astrophysics, v.341, p.697-708 (1999)

Astronomy and Astrophysics

Astrophysics

30

Galaxies: Fundamental Parameters, Galaxies: Photometry, Galaxies: Spiral, Galaxies: Structure

Scientific paper

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 $calM u_{B,0}\sim23 magnitudes arcsec^{-2}$, 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.

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