A projected Nesterov-Kaczmarz approach to stellar population-kinematic distribution reconstruction in Extragalactic Archaeology
- Author(s)
- Fabian Hinterer, Simon Hubmer, Prashin Jethwa, Kirk M. Soodhalter, Glenn van de Ven, Ronny Ramlau
- Abstract
In this paper, we consider the problem of reconstructing a galaxy's stellar population-kinematic distribution function from optical integral field unit measurements. These quantities are connected via a high-dimensional integral equation. To solve this problem, we propose a projected Nesterov-Kaczmarz reconstruction (PNKR) method, which efficiently leverages the problem structure and incorporates physical prior information such as smoothness and non-negativity constraints. To test the performance of our reconstruction approach, we apply it to a dataset simulated from a known ground truth density, and validate it by comparing our recoveries to those obtained by the widely used pPXF software.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Johannes Kepler Universität Linz, Johann Radon Institute for Computational and Applied Mathematics (RICAM) , Trinity College Dublin
- Journal
- SIAM Journal on Imaging Sciences
- Volume
- 16
- Pages
- 192-222
- No. of pages
- 31
- ISSN
- 1936-4954
- DOI
- https://doi.org/10.1137/22M1503002
- Publication date
- 03-2023
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103004 Astrophysics, 101014 Numerical mathematics, 102003 Image processing
- Keywords
- ASJC Scopus subject areas
- Applied Mathematics, General Mathematics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/d5ca85db-d403-42b5-a6ec-0d3207b900bc