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- W4384264593 abstract "Self-interacting dark matter (SIDM) has been proposed as an alternative to the standard collisionless cold dark matter to explain the diversity of galactic rotation curves and core-cusp problems seen at small scales. Here, we estimate the constraints on SIDM for a sample of 11 relaxed galaxy groups with X-ray observations from Chandra and XMM-Newton. We fit the dark matter density distribution to the Einasto profile and use the estimated Einasto $alpha$ parameter to constrain the SIDM cross-section, based on the empirical relation between the two, which was obtained in Eckert et al (2022). We obtain a non-zero central estimate for the cross-section per unit mass ($sigma/m$) for seven groups, with the most precise estimate obtained for NGC 5044, given by $sigma/m=0.165 pm 0.025~rm{cm^2/g}$, for dark matter velocity dispersion of about 300 km/sec. For the remaining four groups, we obtain 95% c.l. upper limits on $sigma/m < 0.16-6.61~rm{cm^2/g}$ with dark matter velocity dispersions between 200-500 km/sec, with the most stringent limit for our sample obtained for the group MKW 4, given by $sigma/m< 0.16~rm{cm^2/g}$ for dark matter velocity dispersion of about 350 km/sec." @default.
- W4384264593 created "2023-07-14" @default.
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- W4384264593 date "2023-07-11" @default.
- W4384264593 modified "2023-10-17" @default.
- W4384264593 title "Constraints on Self-Interacting dark matter from relaxed galaxy groups" @default.
- W4384264593 doi "https://doi.org/10.48550/arxiv.2307.05880" @default.
- W4384264593 hasPublicationYear "2023" @default.
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