Universität zu Köln

Garaldi, Enrico, Romano-Diaz, Emilio, Borzyszkowski, Mikolaj and Porciani, Cristiano (2018). ZOMG - III. The effect of halo assembly on the satellite population. Mon. Not. Roy. Astron. Soc., 473 (2). S. 2234 - 2251. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We use zoom hydrodynamical simulations to investigate the properties of satellites within galaxy-sized dark-matter haloes with different assembly histories. We consider two classes of haloes at redshift z = 0: 'stalled' haloes that assembled at z > 1 and 'accreting' ones that are still forming nowadays. Previously, we showed that the stalled haloes are embedded within thick filaments of the cosmic web, while the accreting ones lie where multiple thin filaments converge. We find that satellites in the two classes have both similar and different properties. Their mass spectra, radial count profiles, baryonic and stellar content, and the amount of material they shed are indistinguishable. However, the mass fraction locked in satellites is substantially larger for the accreting haloes as they experience more mergers at late times. The largest difference is found in the satellite kinematics. Substructures fall towards the accreting haloes along quasi-radial trajectories whereas an important tangential velocity component is developed, before accretion, while orbiting the filament that surrounds the stalled haloes. Thus, the velocity anisotropy parameter of the satellites (beta) is positive for the accreting haloes and negative for the stalled ones. This signature enables us to tentatively categorize the Milky Way halo as stalled based on a recent measurement of beta. Half of our haloes contain clusters of satellites with aligned orbital angular momenta corresponding to flattened structures in space. These features are not driven by baryonic physics and are only found in haloes hosting grand-design spiral galaxies, independently of their assembly history.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Garaldi, Enrico UNSPECIFIED UNSPECIFIED UNSPECIFIED Romano-Diaz, Emilio UNSPECIFIED UNSPECIFIED UNSPECIFIED Borzyszkowski, Mikolaj UNSPECIFIED UNSPECIFIED UNSPECIFIED Porciani, Cristiano UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-204248
DOI:	10.1093/mnras/stx2489
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	473
Number:	2
Page Range:	S. 2234 - 2251
Date:	2018
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DARK-MATTER SUBSTRUCTURE; TULLY-FISHER RELATION; DWARF GALAXIES; DENSITY PROFILE; ORBITAL POLES; THIN PLANE; MASS-LOSS; MILKY; SIMULATIONS; SUBHALOES Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20424