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Date and Time of the Query: 2019-08-24 T08:37:44 PDT
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For refcode 2001MNRAS.327..849R:
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Copyright by Royal Astronomical Society. 2001MNRAS.327..849R Recovering physical parameters from galaxy spectra using MOPED Christian Reichardt, Raul Jimenez and Alan F. Heavens Accepted 2001 June 20. Received 2001 May 9; in original form 2000 December 20 ABSTRACT We derive physical parameters of galaxies from their observed spectra using MOPED, the optimized data compression algorithm of Heavens, Jimenez & Lahav. Here we concentrate on parametrizing galaxy properties, and apply the method to the NGC galaxies in Kennicutt's spectral atlas. We focus on deriving the star formation history, metallicity and dust content of galaxies. The method is very fast, taking a few seconds of CPU time to estimate ~17 parameters, and is therefore specially suited to studying large data sets, such as the Anglo-Australian two-degree-field (2dF) galaxy survey and the Sloan Digital Sky Survey (SDSS). Without the power of MOPED, the recovery of star formation histories in these surveys would be impractical. In Kennicutt's atlas, we find that for the spheroidals a small recent burst of star formation is required to provide the best fit to the spectrum. There is clearly a need for theoretical stellar atmospheric models with spectral resolution better than 1 A if we are to extract all the rich information that large redshift surveys contain in their galaxy spectra. Keywords: methods: data analysis - methods: statistical - galaxies: fundamental parameters - galaxies: statistics - galaxies: stellar content.
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