3,393 research outputs found
Optimal Extraction of Fibre Optic Spectroscopy
We report an optimal extraction methodology, for the reduction of
multi-object fibre spectroscopy data, operating in the regime of tightly packed
(and hence significantly overlapping) fibre profiles. The routine minimises
crosstalk between adjacent fibres and statistically weights the extraction to
reduce noise. As an example of the process we use simulations of the numerous
modes of operation of the AAOmega fibre spectrograph and observational data
from the SPIRAL Integral Field Unit at the Anglo-Australian Telescope.Comment: Accepted for publication in PAS
Long-range correlation and multifractality in Bach's Inventions pitches
We show that it can be considered some of Bach pitches series as a stochastic
process with scaling behavior. Using multifractal deterend fluctuation analysis
(MF-DFA) method, frequency series of Bach pitches have been analyzed. In this
view we find same second moment exponents (after double profiling) in ranges
(1.7-1.8) in his works. Comparing MF-DFA results of original series to those
for shuffled and surrogate series we can distinguish multifractality due to
long-range correlations and a broad probability density function. Finally we
determine the scaling exponents and singularity spectrum. We conclude fat tail
has more effect in its multifractality nature than long-range correlations.Comment: 18 page, 6 figures, to appear in JSTA
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