Subhalo Abundance Matching And Its Cosmological Applications |
| TYPE | Astrophysics Seminar |
| Speaker: | Vimal Simha |
| Affiliation: | Durham University |
| Organizer: | Hagai Perets |
| Date: | 12.02.2014 |
| Time: | 14:30 - 15:30 |
| Location: | Lidow 620 |
| Abstract: | Subhalo abundance matching (SHAM) is a technique for assigning luminosities to simulated dark matter substructures by assuming a strictly monotonic relationship between galaxy luminosity and halo mass at the epoch of accretion. We carry out matched N-body and smoothed particle hydrodynamics (SPH) simulations of a cosmological volume, finding good agreement between SHAM and SPH galaxy stellar masses and luminosities at a wide range of epochs, albeit with relatively small amounts of scatter. By populating N-body simulations with galaxies using SHAM, we generate predictions for the clustering of galaxies as a function of cosmology, and use this to place constraints on the matter density of the Universe ( ΩM ) and the amplitude of clustering (σ8). This technique provides a powerful constraint on the cosmological parameters using only low redshift data that is complementary to other commonly used methods. |