We have used GASPEX (Galaxy Spectrum Parameter EXtraction), a
non-parametric method to determine the non-negative values of the
coefficients that minimize
the sum of the squared residuals between a linear combination of a set
of pre-chosen spectra and the target galaxy SED (Mateu, Bruzual,
Magris 2007, in preparation). The model spectra are from the Bruzual
and Charlot (2003) models.
Our results are presented in 7 text files and 7 figures.
In each text file we show for each target spectrum:
The derived velocity dispersion after removing the intrinsic width of
the
STELIB stellar library
The B-V, g-r colors and the 4000A break for the target spectrum (OBS),
and for the derived spectrum (MOD)
The table contains:
column 1: The central value of each bin age
(yr))
column 2: The accumulated mass fraction from 14
Gyr to the bin centered in the column 1 value
column 3 - 8: Mass fraction formed in the indicated bin age with the
abundance (Z) labeled in each column
Summarizing the properties of each spectrum:
Spectrum 1 (ps, table):
Very old (age > 8Gyr), solar metallicity stellar population
Spectrum 2 (ps, table):
Old, mainly subsolar (84% Z=0.008) with traces of Z=0.004, and possibly
a 3% of solar stellar population
Spectrum 3 (ps, table):
Old, 80% solar and 15% Z=0.004, 2% of solar, younger (3-9 Gyr)
population
Spectrum 4 (ps, table):
Old, 60% solar 38% Z=0.004
Spectrum 5 (ps, table):
Intermediate age (>3 Gyr), solar and subsolar stellar population
Spectrum 6 (ps, table):
82% of solar metallicity and 9% of Z=0.008 mass with age > 9 Gyr,
and 8% of younger (3-9) Gyr of solar metallicity
Spectrum 7 (ps, table):
92% of old (> 9 Gyr), solar metallicity, 2% of Z=0.008 and 5% of
Z=0.004
Gladis Magris, Gustavo Bruzual, Juan Mateu