Generating on-the-fly large samples of theoretical spectra through N-dimensional grid - Astrophysics > Instrumentation and Methods for AstrophysicsReport as inadecuate




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Abstract: Many analyses and parameter estimations undertaken in astronomy require alarge set > 10^5 of non-analytical, theoretical spectra, each of thesedefined by multiple parameters. We describe the construction of anN-dimensional grid which is suitable for generating such spectra. Thetheoretical spectra are designed to correspond to a targeted parameter grid butotherwise to random positions in the parameter space, and they are interpolatedon-the-fly through a pre-calculated grid of spectra. The initial grid isdesigned to be relatively low in parameter resolution and small in occupiedhard disk space and therefore can be updated efficiently when a new model isdesired. In a pilot study of stellar population synthesis of galaxies, the meansquare errors on the estimated parameters are found to decrease with thetargeted grid resolution. This scheme of generating a large model grid isgeneral for other areas of studies, particularly if they are based onmulti-dimensional parameter space and are focused on contrasting modeldifferences.



Author: Ching-Wa Yip Johns Hopkins

Source: https://arxiv.org/







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