Galaxy properties from J-PAS narrow-band photometry

DOI: 
10.1093/mnras/stx1758
Publication date: 
01/11/2017
Main author: 
Mejía-Narváez, A.
IAA authors: 
Benítez, N.
Authors: 
Mejía-Narváez, A.;Bruzual, G.;Magris, C. G.;Alcaniz, J. S.;Benítez, N.;Carneiro, S.;Cenarro, A. J.;Cristóbal-Hornillos, D.;Dupke, R.;Ederoclite, A.;Marín-Franch, A.;de Oliveira, C. Mendes;Moles, M.;Sodre, L.;Taylor, K.;Varela, J.;Ramió, H. Vázquez
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
471
Pages: 
4722-4746
Abstract: 

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.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032269365&doi=10.1093%2fmnras%2fstx1758&partnerID=40&md5=28dcef2e712e4500dc904a08e9abf816
ADS Bibcode: 
2017MNRAS.471.4722M
Keywords: 
methods: data analysis;methods: statistical;galaxies: evolution;galaxies: formation;galaxies: stellar content