Tracking the Lyman alpha emission line in the CircumGalactic Medium in MUSE data

R. Bacher; P. Maho; F. Chatelain; O. Michel

doi:10.1051/eas/1678011

All issues

Volume 78-79 (2016)

EAS Publications Series, 78-79 (2016) 233-245

Abstract

Issue		EAS Publications Series Volume 78-79, 2016 Mathematical Tools for Instrumentation & Signal Processing in Astronomy


Page(s)		233 - 245
Section		Application: Tools in Action
DOI		https://doi.org/10.1051/eas/1678011
Published online		02 September 2016

Mathematical Tools for Instrumentation & Signal Processing in Astronomy
D. Mary, R. Flamary, C. Theys and C. Aime (eds)
EAS Publications Series, 78–79 (2016) 233-245

Tracking the Lyman alpha emission line in the CircumGalactic Medium in MUSE data

R. Bacher¹^,2, P. Maho¹, F. Chatelain¹ and O. Michel¹

¹ GIPSA-Lab, UMR, CNRS 5216, Grenoble University, 38400 Saint Martin d'Hères, France
² CRAL, UMR, CNRS 5574, 9 avenue Charles-Andre, 69230 Saint Genis-Laval, France

e-mail: raphael.bacher@gipsa-lab.fr

Abstract

Since 2014, the Multi Unit Spectroscopic Explorer (MUSE) instrument generates hyperspectral datacubes (300 by 300 pixels by 3600 wavelength in the visible range) of the deep Universe. One of the main purposes of the wide field spectrograph MUSE is to analyse galaxies and their surroundings by the study of their spectra. Galaxy spectra are composed of a continuum emission and of sparse emission (or absorption) peaks. On the contrary surrounding gas only contains peak such as the Lyman alpha emission line. Several methods are developed here to detect the gas signature as far as possible in the galaxy surroundings. These methods combined clustering approaches and several pre-processing steps.