Detection of the Mass-dependent Dual Type Transition of Galaxy Spins in IllustrisTNG Simulations

A numerical detection of the mass-dependent spin transition galaxies is presented. Analyzing a sample with stellar masses in range $10^{9}< (M_{\star}/M_{\odot})\le 10^{11}$ from IllustrisTNG300-1 simulations, we explore alignment tendency between galaxy baryon spins and three eigenvectors linearly reconstructed tidal field as function $M_{\star}$ its evolution redshift $0\le z \le 1.5$. Detecting significant signal occurrence spins, show that centrals differ satellites their type. As increases beyond certain threshold mass, preferred directions central transit minor to intermediate (type two) at $z=0.5$ $1$, while those major one) $z=1$ $1.5$. It also shown mass type depend on morphology, degree alignments total vectors well environmental density. Meanwhile, are found yield weak T1 transitions $z=0$, whose strength trend spins. The possible mechanisms responsible for T2 discussed.