2000/01/11 by V. Kolokotronis, Vaggelis Kolokotronis, Kolokotronis, Vaggelis +8
Engineering · Physics and Astronomy · #Advanced Semiconductor Detectors and Materials #Advanced X-ray Imaging Techniques #Astrophysics (astro-ph) #FOS: Physical sciences #X-ray Spectroscopy and Fluorescence Analysis #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0001184
To be published in the proceedings of the "Large-Scale Structure in the X-ray Universe" meeting, Santorini 1999
arxiv created 2000/01/11 · openalex publication_date 2000/01/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a detailed study of the morphological features of 22 rich galaxy clusters. We systematically compare cluster images and morphological parameters in an attempt to reliably identify possible substructure in both optical and X-ray images. To this end, we compute moments of the surface-brightness distribution to estimate ellipticities, center-of-mass shifts and orientations. We find important correlations between the optical and X-ray morphological shape parameters. Most of our clusters (17) have a good 1-to-1 correspondence between the optical and the X-ray images and at least 9 appear to have strong indications of substructure. This corresponds to a percentage of about 40% in good accordance with other similar analyses. Finally, 4 out of 22 systems seem to have distinct subclumps in the optical which are not verified in the X-ray images, and thus are suspect of being due to optical projection effects. We assess the significance of results using Monte Carlo simulations.