Galaxy spin alignment in filaments and sheets: observational evidence
TL;DR: In this paper, the authors used the SDSS to investigate the spin axes of spiral and elliptical galaxies relative to their surrounding lament/sheet orientations and found that the spin axis of spiral galaxies is aligned with the host lament, with no correlation between spiral spin and sheet normal.
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Abstract: Galaxies properties are known to be aected by their environment. One important question is how their angular momentum reects the surrounding cosmic web. We use the SDSS to investigate the spin axes of spiral and elliptical galaxies relative to their surrounding lament/sheet orientations. To detect laments a marked point process with interactions (the \Bisous model") is used. Sheets are found by detecting \attened" laments. The minor axes of ellipticals are found to be preferentially perpendicular to hosting laments. A weak correlation is found with sheets. These ndings are consistent with the notion that elliptical galaxies formed via mergers which predominantly occurred along the laments. The spin axis of spiral galaxies is found to align with the host lament, with no correlation between spiral spin and sheet normal. When examined as a function of distance from the lament axis, a much stronger correlation is found in outer parts, suggesting that the alignment is driven by the laminar infall of gas from sheets to laments. When compared with numerical simulations our results suggest that the connection between DM halo and galaxy spin is not straightforward. Our results provide an important input to the understanding of how galaxies acquire their angular momentum. Subject headings: galaxies: formation | galaxies: spiral | large-scale structure of universe | methods: observational | methods: statistical
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