期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 460, 期 4, 页码 4466-4482出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1286
关键词
galaxies: evolution; galaxies: formation; galaxies: haloes; galaxies: kinematics and dynamics; galaxies: structure
资金
- DNRF
- EU under Marie Curie International Incoming Fellowship [PIIF-GA-2013-62772]
- Science and Technology Facilities Council [ST/F001166/1]
- European Research Council [GA 267291, GA 278594]
- Interuniversity Attraction Poles Programme
- Belgian Science Policy Office [AP P7/08 CHARM]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grant [ST/H008519/1]
- STFC DiRAC Operations grant [ST/K003267/1]
- Durham University
- Science and Technology Facilities Council [ST/I001573/1, ST/M000966/1, ST/H008519/1, ST/I00162X/1, ST/M007006/1, ST/K00042X/1, ST/L00075X/1] Funding Source: researchfish
- STFC [ST/I00162X/1, ST/H008519/1, ST/L00075X/1, ST/K00042X/1, ST/M007006/1, ST/I001573/1] Funding Source: UKRI
We explore the co-evolution of the specific angular momentum of dark matter haloes and the cold baryons that comprise the galaxies within. We study over 2000 galaxies within the reference cosmological hydrodynamical simulation of the 'Evolution and Assembly of GaLaxies and their Environments' (EAGLE) project. We employ a methodology within which the evolutionary history of a system is specified by the time-evolving properties of the Lagrangian particles that define it at z = 0. We find a strong correlation between the evolution of the specific angular momentum of today's stars (cold gas) and that of the inner (whole) dark matter halo they are associated with. This link is particularly strong for the stars formed before the epoch of maximum expansion and subsequent collapse of the central dark matter halo (turnaround). Spheroids are assembled primarily from stars formed prior to turnaround, and suffer a net loss of angular momentum associated with the strong merging activity during the assembly of the inner dark matter halo. Stellar discs retain their specific angular momentum since they are comprised of stars formed mainly after turnaround, from gas that mostly preserves the high specific angular momentum it acquired by tidal torques during the linear growth of the halo. Since the specific angular momentum loss of the stars is tied to the galaxy's morphology today, it may be possible to use our results to predict, statistically, the maximum loss of specific angular momentum of the inner part of a halo given the morphology of the galaxy it hosts.
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