Artículo
Cluster halo shapes in CDM and SIDM models: unveiling the DM particle nature using a weak-lensing approach
Gonzalez, Elizabeth Johana
; Rodríguez Medrano, Agustín Miguel
; Pereyra, Luis Alberto
; Garcia Lambas, Diego Rodolfo




Fecha de publicación:
01/2024
Editorial:
Oxford University Press
Revista:
Monthly Notices of the Royal Astronomical Society
e-ISSN:
1365-2966
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Self-interacting dark matter (SIDM) is an alternative to the standard collisionless cold dark matter model (CDM), allowing for interactions between the dark matter particles through the introduction of a self-scattering cross-section. However, the observable effects between these two scenarios are hard to detect. In this work we present a detailed analysis of an application of galaxy-galaxy lensing to measure with high precision the shapes of cluster halos and how this approach can be used to obtain information regarding the nature of the dark matter particle. Using two sets of simulated data, SIDM and CDM simulations, we compute stacked shear maps centred on several subsets of halos with masses ≳ 1013.5 ⊙ . From these maps, we obtain the quadrupole profiles related to the mean projected elongation of the particle distribution from which the shape parameters are derived. Accounting for a radial shape variation, this technique provides an enhancement of the observed differences between the simulated data-sets. In particular, we obtain a higher slope of the power law for the shape-radial relation for the halos identified in the SIDM simulation, which are rounder towards the centre. Also, as approaching to the mean virial radius, the projected semi-axis ratios converge to similar values than in the CDM simulation. Moreover, we account for the impact of the neighbouring mass, where more strongly elongated distributions are found for the halos in the SIDM simulation, indicating that under dark matter self interaction, the large scale structure imprints a more coherent accretion process.
Palabras clave:
GRAVITATIONAL LENSING: WEAK
,
GALAXIES: HALOES
,
DARK MATTER
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Articulos(IATE)
Articulos de INST.DE ASTRONOMIA TEORICA Y EXPERIMENTAL
Articulos de INST.DE ASTRONOMIA TEORICA Y EXPERIMENTAL
Citación
Gonzalez, Elizabeth Johana; Rodríguez Medrano, Agustín Miguel; Pereyra, Luis Alberto; Garcia Lambas, Diego Rodolfo; Cluster halo shapes in CDM and SIDM models: unveiling the DM particle nature using a weak-lensing approach; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 528; 2; 1-2024; 3075-3091
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