Computer Science
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..296h&link_type=abstract
THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 296-302 (2
Computer Science
2
Star Formation, Galaxies, Colour, Stellar Spectra, Origin, Formation, Evolution, Age, And Star Formation, Hertzsprung-Russell, Color-Magnitude, And Color-Color Diagrams, Stellar Content And Populations, Radii, Morphology And Overall Structure
Scientific paper
We present results from a study of the star formation history (SFH) of a sample of Low Surface Brightness (LSB) galaxies. The LSB sample resulted from a search around the HDF-S (field size: 0.6 deg2) using SExtractor in combination with a median filter technique. For the selection of the LSB galaxy candidates we used color-color diagrams (U-B vs. B-R). From the color-color diagram LSB candidates were selected based on their different location in comparison to the High Surface Brightness (HSB) galaxy redshift tracks. With this method and a lower diameter limit of 10 arcsec we derived a sample of 7 LSB galaxies. For this sample we derived spectral energy distributions (SEDs) from 3500 Å to 7000 Å using ESO 3.6m telescope. The measured SEDs we compared to synthetic spectra extracted from the synthesis evolution model PEGASE (Rocca & Volmerange 1997). The synthetic spectra were derived assuming exponential declining SFR using decay times between 500 Myr and 5 Gyr. Comparing a library of nearly 3000 sunthetic SEDs to the measured spectra we were able to derive ages between 2 to 5 Gyrs for the dominant stellar population. Applying the same method to a sample of HSB galaxies results in an averaged stellar population of about 10 to 14 Gyr. Therefore LSB galaxies tend to show much younger averaged stellar populations. This implies that the major star formation event of LSB galaxies took place at much later stages at (z ~ 0.2 to 0.4) while for the HSB galaxies this tends to happen at redshifts arround z ~ 2 to 4.
Bomans Dominik J.
Dettmar Ralf-Juergen
Haberzettl Lutz
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