2023MNRAS.519L..87D

Query : 2023MNRAS.519L..87D

2023MNRAS.519L..87D - Mon. Not. R. Astron. Soc., 519, L87-L91 (2023/February-2)

A correlation between accreted stellar kinematics and dark-matter halo spin in the ARTEMIS simulations.

DILLAMORE A.M., BELOKUROV V., EVANS N.W. and FONT A.S.

Abstract (from CDS):

We report a correlation between the presence of a Gaia-Sausage-Enceladus (GSE) analogue and dark-matter (DM) halo spin in the ARTEMIS simulations of Milky Way-like galaxies. The haloes which contain a large population of accreted stars on highly radial orbits (like the GSE) have lower spin on average than their counterparts with more isotropic stellar velocity distributions. The median modified spin parameters λ' differ by a factor of ∼1.7 at the present day, with a similar value when the haloes far from virial equilibrium are removed. We also show that accreted stars make up a smaller proportion of the stellar populations in haloes containing a GSE analogue, and are stripped from satellites with stellar masses typically ∼4 times smaller. Our findings suggest that the higher spin of DM haloes without a GSE-like feature is due to mergers with large satellites of stellar mass ∼1010M⊙, which do not result in prominent radially anisotropic features like the GSE.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: formation - galaxies: haloes - galaxies: kinematics and dynamics - galaxies: structure

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 Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

Query : 2023MNRAS.519L..87D

Basic data :
NAME Gaia Enceladus-Sausage -- Stellar Stream
Other object types: otypes_help 		St* (), G (2018Natur)
ICRS coord. (ep=J2000) : 		No Coord.

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 187 		Display criteria :

Identifiers (8) :
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NAME Gaia-Enceladus NAME Gaia Enceladus-Sausage
NAME Gaia Sausage-Enceladus NAME Gaia Sausage

References (860 between 1850 and 2026) (Total 860)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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