Spectrophotometric properties of galaxies: automatic measurement and analysis tools for large surveys.

Details Spectrophotometric properties of galaxies: automatic measurement and analysis tools for large surveys. Spectrophotometric properties of galaxies: automatic measurement and analysis tools for large surveys.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..609l&link_type=abstract

%J SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Bar

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a new pipeline designed to derive the physical properties of emission-line galaxies from ongoing massive spectroscopic surveys (e.g. VVDS, z-COSMOS, ...). The first tool performs a stellar continuum fitting and subtraction of a large amount of spectra in a minimum waste of time. It then measures all the parameters (flux, EW, etc) of emission-lines together with the "spectroscopic" magnitudes and colors. The second software takes all these measurements and derive a number of physical properties like chemical abundances, dust extinction, spectral classification, etc. The pipeline is designed to be fully automatic and flexible, with many configurable options.
As an example, we show the first results of a project aiming to derive the physical properties of emission-line galaxies at intermediate redshifts (z=0.2~0.7). The sample has been selected mainly among CFRS galaxies with the addition of galaxies observed in and behind lensing clusters. Optical medium-resolution spectra have been acquired with the FORS1/2 spectrographs on the VLT. We took advantage of this sample to test the efficiency of our pipeline compared to manual measurements. We also check that it will give good results on lower resolution spectra, which is the case of ongoing large surveys. We finally present a set of scientific results drawn from this sample.

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