A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups

K., Gopika and Desai, Shantanu (2021) A test of constancy of dark matter halo surface density and radial acceleration relation in relaxed galaxy groups. Physics of the Dark Universe, 33. ISSN 2212-6864

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The dark matter halo surface density, given by the product of the dark matter core radius (rc) and core density (ρc) has been shown to be a constant for a wide range of isolated galaxy systems. Here, we carry out a test of this ansatz using a sample of 17 relaxed galaxy groups observed using Chandra and XMM-Newton, as an extension of our previous analysis with galaxy clusters. We find that ρc∝rc−1.35, with an intrinsic scatter of about 27.3%, which is about 1.5 times larger than that seen for galaxy clusters. Our results thereby indicate that the surface density is discrepant with respect to scale invariance by about 2σ, and its value is about four times greater than that for galaxies. Therefore, the elevated values of the halo surface density for groups and clusters indicate that the surface density cannot be a universal constant for all dark matter dominated systems. Furthermore, we also implement a test of the radial acceleration relation for this group sample. We find that the residual scatter in the radial acceleration relation is about 0.32 dex and a factor of three larger than that obtained using galaxy clusters. The acceleration scale which we obtain is in-between that seen for galaxies and clusters. © 2021 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Additional Information: This work was partially funded by DARPA under Grant HR0011-06-2-0001. The views, opinions, and/or findings contained in this article/presentation are those of the author/presenter and should not be interpreted as representing the official views or policies, either expressed or implied, of the Defense Advanced Research Projects Agency or the Department of Defense. We thank Young-Suk Lee for her parser and Stan Chen for his language modeling software.
Uncontrolled Keywords: Constant halo surface density; Dark matter; Galaxy groups; Radial acceleration relation
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 04 Aug 2022 07:41
Last Modified: 04 Aug 2022 07:41
URI: http://raiith.iith.ac.in/id/eprint/10084
Publisher URL: http://doi.org/10.1016/j.dark.2021.100874
OA policy: https://v2.sherpa.ac.uk/id/publication/24554
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