RASHIDI, Arash; YAHIA, Hussein; BONTEMPS, S.; SCHNEIDER, N.; BONNE, L.; HENNEBELLE, P.; SCHOLTYS, J.; ATTUEL, Guillaume; TURIEL, A.; SIMON, R.; CAILLY, A.; ZEBADUA, A.; CHERIF, A.; LACROIX, C.; MARTIN, Marie; EL AOUNI, Anass; SAKKA, Chiheb; MAJI, S.K.

doi:10.1051/0004-6361/202346499

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RASHIDI, Arash
Geometry and Statistics in acquisition data [GeoStat]

YAHIA, Hussein
Geometry and Statistics in acquisition data [GeoStat]

BONTEMPS, S.
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

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Article de revue

Ce document a été publié dans

Astronomy and Astrophysics - A&A. 2024-06-05

EDP Sciences

Résumé en anglais

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.< Réduire

Mots clés en anglais

ISM: structure

ISM: individual objects: Turbulence

ISM: clouds

magnetohydrodynamics

noise reduction

mathematical optimisation

multifractals

DOI

http://dx.doi.org/10.1051/0004-6361/202346499

Projet Européen

Collaborative Research Center 1601 sub-project B2, funded by the DFG, German Research Foundation – 500700252

Project ANR

GENeration et Evolution des Structures du milieu InterStellaire - ANR-16-CE92-0035

Origine

Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804