SPECTRAL ENERGY DISTRIBUTION FITTING WITH MARKOV CHAIN MONTE CARLO: METHODOLOGY AND APPLICATION TO <i>z</i>=3.1 Lyα-EMITTING GALAXIES

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dc.contributor.authorAcquaviva, Viviana
dc.contributor.authorGawiser, Eric
dc.contributor.authorGuaita, Lucia
dc.date.accessioned2025-01-21T00:00:48Z
dc.date.available2025-01-21T00:00:48Z
dc.date.issued2011
dc.description.abstractWe present GalMC, a Markov Chain Monte Carlo (MCMC) algorithm designed to fit the spectral energy distributions (SEDs) of galaxies to infer physical properties such as age, stellar mass, dust reddening, metallicity, redshift, and star formation rate. We describe the features of the code and the extensive tests conducted to ensure that our procedure leads to unbiased parameter estimation and accurate evaluation of uncertainties. We compare its performance to grid-based algorithms, showing that the efficiency in CPU time is similar to 100 times better for MCMC for a three-dimensional parameter space and increasing with the number of dimensions. We use GalMC to fit the stacked SEDs of two samples of Lyman alpha emitters (LAEs) at redshift z = 3.1. Our fit reveals that the typical LAE detected in the IRAC 3.6 mu m band has age = 0.67 [0.37-1.81] Gyr and stellar mass = 3.2 [2.5-4.2] x 10(9) M-circle dot, while the typical LAE not detected at 3.6 mu m has age = 0.06 [0.01-0.2] Gyr and stellar mass = 2 [1.1-3.4] x 10(8) M-circle dot. The SEDs of both stacks are consistent with the absence of dust. The data do not significantly prefer exponential with respect to constant star formation history. The stellar populations of these two samples are consistent with the previous study by Lai et al., with some differences due to the improved modeling of the stellar populations. A constraint on the metallicity of z = 3.1 LAEs from broadband photometry, requiring Z < Z(circle dot) at 95% confidence, is found here for the first time.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/737/2/47
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.1088/0004-637X/737/2/47
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95358
dc.identifier.wosidWOS:000294013600001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies: fundamental parameters
dc.subjectgalaxies: statistics
dc.subjectmethods: statistical
dc.titleSPECTRAL ENERGY DISTRIBUTION FITTING WITH MARKOV CHAIN MONTE CARLO: METHODOLOGY AND APPLICATION TO <i>z</i>=3.1 Lyα-EMITTING GALAXIES
dc.typeartículo
dc.volumen737
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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