Description of turbulent dynamics in the interstellar medium: Multifractal microcanonical analysis. II. Sparse filtering of Herschel observation maps and visualization of filamentarystructures at different length scales
Language
en
Article de revue
This item was published in
Astronomy and Astrophysics - A&A. 2024-06-05
EDP Sciences
English Abstract
We present significant improvements to our previous work on noise reduction in Herschel observation maps by defining sparse filtering tools capable of handling, in a unified formalism, a significantly improved noise reduction ...Read more >
We present significant improvements to our previous work on noise reduction in Herschel observation maps by defining sparse filtering tools capable of handling, in a unified formalism, a significantly improved noise reduction as well as a deconvolution in order to reduce effects introduced by the limited instrumental response (beam). We implement greater flexibility by allowing a wider choice of parsimonious priors in the noise-reduction process. More precisely, we introduce a sparse filtering and deconvolution approach approach of type $l^2$-$l^p$, with $p > 0$ variable and apply it to a larger set of molecular clouds using Herschel $m data in order to demonstrate their wide range of application. In the Herschel data, we are able to use this approach to highlight extremely fine filamentary structures and obtain singularity spectra that tend to show a significantly less log -normal behavior and a filamentary nature in the less dense regions. We also use high-resolution adaptive magneto-hydrodynamic simulation data to assess the quality of deconvolution in such a simulated beaming framework.Read less <
English Keywords
ISM: structure
ISM: individual objects: Turbulence
ISM: clouds
magnetohydrodynamics
noise reduction
mathematical optimisation
multifractals
European Project
Collaborative Research Center 1601 sub-project B2, funded by the DFG, German Research Foundation – 500700252
ANR Project
GENeration et Evolution des Structures du milieu InterStellaire - ANR-16-CE92-0035
Origin
Hal imported