The Cosmic Ballet: spinning in the web

TYPEAstrophysics Seminar
Speaker:Punyakoti (Punya) Ganeshaiah Veena
Affiliation:Department of Physics, Technion
Time:14:30 - 15:30
Location:Lidow 620

All the celestial objects, from small asteroids and planets to large galaxies and even the long filaments of the cosmic web are rotating. According to the classical tidal torque theory, in the early Universe, as matter began to clump together, the resulting anisotropic distribution of matter torqued up proto-galaxies. Simultaneously, the matter overdensities collapsed to form the large-scale filaments, clusters, walls and voids of the cosmic web that we see today. As a result, we expect a correlation between galaxy spin and the cosmic web. During the talk, I will discuss the role of the cosmic web environment in establishing the rotation of haloes and galaxies using large cosmological simulations and using NEXUS and Bisous formalisms to detect the cosmic web. I will present the correlations between the spin-axis of haloes/galaxies with the orientation of the cosmic web environment that they are growing in. I will also discuss in detail the spin transition from parallel to perpendicular as a function of the halo or galaxy mass with respect to the spine of the host filament and show how these trends evolve with cosmic time and filament properties.