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EA: Spin alignment around Illustris voids – Dávila Kurbán

April 20 @ 10:30 am 10:45 am CMT

Using a set of well–behaved novel statistical parameters we study the alignment signal of galactic spins with respect to the centre of voids identified in the TNG-300 simulation. We explore this signal in different samples of galaxies, varying their distance from the void centre, mass, spin norm, local density, and velocity. We find a signal of over 9 sigmas of massive, high-spin, and low radial velocity galaxies to be aligned perpendicularly to the void-centric direction for distances varying from 0.9 to 1.4 void radii. Furthermore, we find that, in these subdense environments, local density is irrelevant to the alignment signal, while the largest impact on the alignment is due to radial velocity: galaxies that lose linear momentum with the void expansion seem to be strongly aligned perpendicularly to the centre of the void.

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