Séminaire Doctoral / Seminar PhD |
| « Detection of intra-cluster diffuse light: presenting DAWIS » |
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Amaël Ellien |
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The Intracluster light (ICL) is a diffuse component of galaxy
clusters or groups in the visible and NIR wavelengths. It is composed of stars that do not belong to any specific galaxy, but that are more related to the global gravitational potential of their cluster/group. The very low surface brightness of this diffuse component (few percent of the sky background) and the various sources of contamination (scattered light in the detector, blending into galaxy light profiles...) make its detection a challenge. Here we choose a multiscale approach to the problem and create DAWIS, a Detection Algorithm with Wavelets for Intracluster light Surveys. We apply it to the core of MACSJ0717, a massive galaxy cluster which is part of the Hubble Frontier Field, and to its south-east cosmic filament. |
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vendredi 3 mai 2019 - 16:00 Salle Entresol Daniel Chalonge, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |