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The SAMI Galaxy Survey: First detection of a transition in spin orientation with respect to cosmic filaments in the stellar kinematics of galaxies

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arxiv 1909.12371 v1 pith:FZVHGPGJ submitted 2019-09-26 astro-ph.GA astro-ph.COastro-ph.IM

C. Welker , J. Bland-Hawthorn , J. Van de Sande , C. Lagos , P. Elahi , D. Obreschkow , J. Bryant , C. Pichon
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L. Cortese S. N. Richards S. M. Croom M. Goodwin J. S. Lawrence S. Sweet A. Lopez-Sanchez A. Medling M. S. Owers Y. Dubois J. Devriendt
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classification astro-ph.GAastro-ph.COastro-ph.IM
keywords cosmicfilamentsmassstellarfilamentgalaxiesspinalignment
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We present the first detection of mass dependent galactic spin alignments with local cosmic filaments with over 2 sigma confidence using IFS kinematics. The 3D network of cosmic filaments is reconstructed on Mpc scales across GAMA fields using the cosmic web extractor DisPerSe. We assign field galaxies from the SAMI survey to their nearest filament segment in 3D and estimate the degree of alignment between SAMI galaxies kinematic spin axis and their nearest filament in projection. Low-mass galaxies align their spin with their nearest filament while higher mass counterparts are more likely to display an orthogonal orientation. The stellar transition mass from the first trend to the second is bracketed between log stellar masses 10.4 and 10.9, with hints of an increase with filament scale. Consistent signals are found in the HorizonAGN cosmological hydrodynamic simulation. This supports a scenario of early angular momentum build-up in vorticity rich quadrants around filaments at low stellar mass followed by progressive flip of spins orthogonal to the cosmic filaments through mergers at high stellar mass. Conversely, we show that dark-matter only simulations post-processed with a semi-analytic model treatment of galaxy formation struggles to reproduce this alignment signal. This suggests that gas physics is key in enhancing the galaxy-filament alignment.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The role of filaments in the large-scale conformity signal

    astro-ph.GA 2026-07 accept novelty 6.0 of 10

    Filamentary regions of the cosmic web are the primary contributors to the residual large-scale conformity signal of low-mass central galaxies in both SAG and TNG300.

  2. Constraints on the population level distribution of nearby Dark Matter halo shapes with extragalactic streams

    astro-ph.GA 2026-07 conditional novelty 5.5 of 10

    A gold subsample of 17 photometry-only extragalactic streams yields a mildly oblate dark-matter halo population with mean flattening μ_q ≈ 0.72 and scatter σ_q ≈ 0.34.

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