Bibcode
Díaz-García, L. A.; Cenarro, A. J.; López-Sanjuan, C.; Ferreras, I.; Varela, J.; Viironen, K.; Cristóbal-Hornillos, D.; Moles, M.; Marín-Franch, A.; Arnalte-Mur, P.; Ascaso, B.; Cerviño, M.; González Delgado, R. M.; Márquez, I.; Masegosa, J.; Molino, A.; Pović, M.; Alfaro, E.; Aparicio-Villegas, T.; Benítez, N.; Broadhurst, T.; Cabrera-Caño, J.; Castander, F. J.; Cepa, J.; Fernández-Soto, A.; Husillos, C.; Infante, L.; Aguerri, J. A. L.; Martínez, V. J.; del Olmo, A.; Perea, J.; Prada, F.; Quintana, J. M.; Gruel, N.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 582, id.A14, 31 pp.
Fecha de publicación:
10
2015
Revista
Número de citas
33
Número de citas referidas
30
Descripción
Aims: We present MUFFIT, a new generic code optimized to retrieve
the main stellar population parameters of galaxies in photometric
multi-filter surveys, and check its reliability and feasibility with
real galaxy data from the ALHAMBRA survey. Methods: Making use of
an error-weighted χ2-test, we compare the multi-filter
fluxes of galaxies with the synthetic photometry of mixtures of two
single stellar populations at different redshifts and extinctions, to
provide the most likely range of stellar population parameters (mainly
ages and metallicities), extinctions, redshifts, and stellar masses. To
improve the diagnostic reliability, MUFFIT identifies and removes from
the analysis those bands that are significantly affected by emission
lines. The final parameters and their uncertainties are derived by a
Monte Carlo method, using the individual photometric uncertainties in
each band. Finally, we discuss the accuracies, degeneracies, and
reliability of MUFFIT using both simulated and real galaxies from
ALHAMBRA, comparing with results from the literature. Results:
MUFFIT is a precise and reliable code to derive stellar population
parameters of galaxies in ALHAMBRA. Using the results from
photometric-redshift codes as input, MUFFIT improves the
photometric-redshift accuracy by ~10-20%. MUFFIT also detects nebular
emissions in galaxies, providing physical information about their
strengths. The stellar masses derived from MUFFIT show excellent
agreement with the COSMOS and SDSS values. In addition, the retrieved
age-metallicity locus for a sample of z ≤ 0.22 early-type galaxies in
ALHAMBRA at different stellar mass bins are in very good agreement with
the ones from SDSS spectroscopic diagnostics. Moreover, a one-to-one
comparison between the redshifts, ages, metallicities, and stellar
masses derived spectroscopically for SDSS and by MUFFIT for ALHAMBRA
reveals good qualitative agreements in all the parameters, hence
reinforcing the strengths of multi-filter galaxy data and optimized
analysis techniques, like MUFFIT, to conduct reliable stellar population
studies.
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