The Star Formation Histories of galaxies: A tour through the STARLIGHT-SDSS database - AstrophysicsReport as inadecuate

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Abstract: Retrieving the Star Formation History SFH of a galaxy out of its integratedspectrum is the central goal of stellar population synthesis. Recent advancesin evolutionary synthesis models have given new breath to this old field ofresearch. Modern spectral synthesis techniques incorporating these advances nowallow the fitting of galaxy spectra on an angstrom-by-angstrom basis. Thesedetailed fits are useful for a number of studies, like emission line, stellarkinematics, and specially galaxy evolution. Applications of this semi-empiricalapproach to mega data sets are teaching us a lot about the lives of galaxies.The STARLIGHT spectral synthesis code is one of the tools which allows one toharness this favorable combination of plentifulness of data and models. Toillustrate this, we show how SFHs vary across classical emission linediagnostic diagrams. Systematic trends are present along both the star-formingand active-galaxy sequences. We also briefly describe experiments with newversions of evolutionary synthesis models. Last but not least, we announce thepublic availability of both STARLIGHT and a database of detailed spectral fitsand related products for over half a million galaxies from the SDSS. Thisfacility allows more physically inspired explorations of the parameter spacethan is possible in terms of raw observed properties, offering new ways tonavigate through the realm of galaxies.

Author: R. Cid Fernandes 1, W. Schoenell 1, J. M. Gomes 1, N V. Asari 1, M. Schlickmann 1, A. Mateus 2, G. Stasinska 3, L. Sodre 4, J. P.



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