Galaxy properties from J-PAS narrow-band photometry
Por:
Mejia-Narvaez, A., Bruzual, G., Magris, G. C., Alcaniz, J. S., Benitez, N., Carneiro, S., Cenarro, A. J., Cristobal-Hornillos, D., Dupke, R., Ederoclite, A., Marin-Franch, A., Mendes de Oliveira, C., Moles, M., Sodre, Jr., L., Taylor, K., Varela, J., Vazquez Ramio, H.
Publicada:
1 nov 2017
Resumen:
We study the consistency of the physical properties of galaxies
retrieved from spectral energy distribution (SED) fitting as a function
of spectral resolution and signal-to-noise ratio (SNR). Using a
selection of physically motivated star formation histories, we set up a
control sample of mock galaxy spectra representing observations of the
local Universe in high-resolution spectroscopy, and in 56 narrow-band
and 5 broad-band photometry. We fit the SEDs at these spectral
resolutions and compute their corresponding stellar mass, the mass-and
luminosity-weighted age and metallicity, and the dust extinction. We
study the biases, correlations and degeneracies affecting the retrieved
parameters and explore the role of the spectral resolution and the SNR
in regulating these degeneracies. We find that narrow-band photometry
and spectroscopy yield similar trends in the physical properties
derived, the former being considerably more precise. Using a galaxy
sample from the Sloan Digital Sky Survey (SDSS), we compare more
realistically the results obtained from high-resolution and narrow-band
SEDs (synthesized from the same SDSS spectra) following the same
spectral fitting procedures. We use results from the literature as a
benchmark to our spectroscopic estimates and show that the prior
probability distribution functions, commonly adopted in parametric
methods, may introduce biases not accounted for in a Bayesian framework.
We conclude that narrow-band photometry yields the same trend in the
age-metallicity relation in the literature, provided it is affected by
the same biases as spectroscopy, albeit the precision achieved with the
latter is generally twice as large as with the narrow-band, at SNR
values typical of the different kinds of data.
Filiaciones:
Mejia-Narvaez, A.:
Ctr Invest Astron, AP 264, Merida 5101A, Venezuela
Univ Los Andes, Posgrad Fis Fundamental, Merida, Venezuela
Bruzual, G.:
UNAM, IRyA, Campus Morelia,AP 3-72, Morelia 58089, Michoacan, Mexico
Magris, G. C.:
Ctr Invest Astron, AP 264, Merida 5101A, Venezuela
Alcaniz, J. S.:
Observ Nacl MCT, Rua Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil
Benitez, N.:
CSIC, IAA, Glorieta Astron S-N, E-18008 Granada, Spain
Carneiro, S.:
Univ Fed Bahia, Inst Fis, BR-40210340 Salvador, BA, Brazil
Cenarro, A. J.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Cristobal-Hornillos, D.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Dupke, R.:
Observ Nacl MCT, Rua Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil
Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
Ederoclite, A.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Marin-Franch, A.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Mendes de Oliveira, C.:
Sodre, L
Moles, M.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Taylor, K.:
Observ Nacl MCT, Rua Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil
Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Cidade Univ, BR-05508090 Sao Paulo, Brazil
Varela, J.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
Vazquez Ramio, H.:
Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, E-44001 Teruel, Spain
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