Subhaloes are anisotropically distributed and aligned with the smooth matter distribution of their host haloes

Mezini, Lorena; Zentner, Andrew R.; Wang, Kuan; Fielder, Catherine

doi:10.1093/mnras/staf331

Subhaloes are anisotropically distributed and aligned with the smooth matter distribution of their host haloes

Journal Article · Sat Feb 22 00:00:00 EST 2025 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/staf331· OSTI ID:2530498

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ABSTRACT

We investigate the distributions of subhaloes about their hosts in two suites of zoom-in N-body simulations of halo growth – one suite focused on Milky Way-Mass haloes ($$\sim 10^{12} \, \mathrm{M}_{\odot }$$) and another focused on cluster-mass haloes ($$\sim 10^{15} \, \mathrm{M}_{\odot }$$) in the Symphony simulation suite. We find, in agreement with previous work on this subject, that subhaloes are distributed anisotropically about their host haloes. In particular, the positions of subhaloes lie preferentially near the major axes of their host haloes, possibly implying that satellite galaxies will exhibit a similar alignment. Furthermore, we show that in two-dimensional projection subhaloes are more likely to be observed near the halo centre (where the central galaxy presumably resides) when the host halo is projected nearly along its major axis. This projection effect is significant. Within projected radii of a few per cent of the virial radius of the host halo, the fraction of mass in subhaloes is $$\sim 175~{{\ \rm per\ cent}}$$ larger for Milky Way-mass haloes and as much as $$\sim 195~{{\ \rm per\ cent}}$$ larger for cluster haloes when projected along the major axis as compared to the average from a random projection. This result has consequences for many applications including the interpretation of gravitational lenses. Finally, we find that the orbital angular momentum vector of subhaloes is aligned with the angular momentum vector of their host halo, indicating that a significant component of a halo’s angular momentum may be carried in its subhaloes. This has consequences for galaxy formation models which use host halo angular momentum as a proxy for galaxy momentum.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2530498

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 538; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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LSST: From Science Drivers to Reference Design and Anticipated Data Products Ivezić, Željko; Kahn, Steven M.; Tyson, J. Anthony The Astrophysical Journal, Vol. 873, Issue 2 https://doi.org/10.3847/1538-4357/ab042c	journal	March 2019
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Lopsided Satellite Distributions around Isolated Host Galaxies in a ΛCDM Universe Samuels, Adam; Brainerd, Tereasa G. The Astrophysical Journal, Vol. 947, Issue 2 https://doi.org/10.3847/1538-4357/acc069	journal	April 2023
The PAndAS View of the Andromeda Satellite System. IV. Global Properties Doliva-Dolinsky, Amandine; Martin, Nicolas F.; Yuan 袁, Zhen 珍 The Astrophysical Journal, Vol. 952, Issue 1 https://doi.org/10.3847/1538-4357/acdcf6	journal	July 2023
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