Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93..397c&link_type=abstract
The Astrophysical Journal: Supplement Series, vol. 93, no. 2, p. 397-424
Astronomy and Astrophysics
Astrophysics
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.
Cellone Sergio A.
Forte Juan Carlos
Geisler Doug
No associations
LandOfFree
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.
Profile ID: LFWR-SCP-O-1494693