A morphological and color study of Fornax low surface brightness galaxies in the Washington system

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

43

Astronomical Models, Brightness, Dwarf Galaxies, Elliptical Galaxies, Galactic Structure, Globular Clusters, Stellar Composition, Stellar Luminosity, Astronomical Photometry, Charge Coupled Devices, Image Processing, Metallicity

Scientific paper

We present Washington charge coupled devices (CCD) surface photometry of a sample of low surface brightness dwarf galaxies in the Fornax Cluster. Their surface brightness profiles are not always well fitted by 'pure' exponential models; instead, the introduction of a shape parameter in the model profile produces very good fits. This shape parameter correlates with total magnitude; however, there may be selection effects involving the average surface brightness of the galaxies which lead to this correlation. The color profiles of these galaxies show no meaningful gradient, except for the brightest dwarf, which shows evidence of recent or current star-forming activity at its center. Integrated colors show a dissimilar behavior: the (M - T1) index is almost constant for the whole sample, while (C - T1), which is known to be a good metallicity indicator, correlates with the structural parameters, evidencing the existence of a luminosity-metal abundance relation among these dwarfs. This relation is consistent with that already known for Local Group early-type dwarfs. No difference is found between the colors of nucleated and nonnucleated galaxies of the same luminosity. Since total magnitudes correlate with central surface brightnesses and diameters, the more metal-rich dwarfs are also the largest and those of higher surface brightness. However, as the correlations between the different structural parameters are affected by selection effects, it is still not clear which of these parameters determine a galaxy's integrated colors, and hence its metallicity.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

A morphological and color study of Fornax low surface brightness galaxies in the Washington system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A morphological and color study of Fornax low surface brightness galaxies in the Washington system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A morphological and color study of Fornax low surface brightness galaxies in the Washington system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1494693

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.