2024ApJ...968L..13Z

Query : 2024ApJ...968L..13Z

2024ApJ...968L..13Z - Astrophys. J., 968, L13 (2024/June-2)

Self-interacting Dark Matter Interpretation of Crater II.

ZHANG X., YU H.-B., YANG D. and AN H.

Abstract (from CDS):

The satellite galaxy Crater II of the Milky Way is extremely cold and exceptionally diffuse. These unusual properties are challenging to understand in the standard model of cold dark matter. We use controlled N-body simulations to investigate the formation of Crater II in self-interacting dark matter (SIDM), where dark matter particles can scatter and thermalize. Taking the orbit motivated by the measurements from Gaia Early Data Release 3, we show a strong self-interacting cross section per particle mass of 60 cm2 g–1 is favored for Crater II. The simulated SIDM halo, with a 1 kpc core, leads to both a low stellar velocity dispersion and a large half-light radius for Crater II. These characteristics remain robust regardless of the initial stellar distribution.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dark matter - Dwarf spheroidal galaxies - Galaxy dark matter halos

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0

Query : 2024ApJ...968L..13Z

Basic data :
NAME Crater II Dwarf Galaxy -- Galaxy
Other object types: otypes_help 		G (2016MNRAS)
ICRS coord. (ep=J2000) : 		11 49 14.4 -18 24 47 (Optical) [ ] D 2016MNRAS.459.2370T
FK4 coord. (ep=B1950 eq=1950) : 		11 46 41.8 -18 08 06 [ ]
Gal coord. (ep=J2000) : 		282.9084 +42.0276 [ ]
Morphological type: 		-3 D 2018MNRAS.479.4136K
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Hierarchy : number of linked objects
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NAME Crater II Dwarf Galaxy NAME Crater 2 Dwarf Galaxy

References (176 between 1850 and 2026) (Total 176)
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