Probing Dark Matter with Galactic Substructure
by Oren Slone
Princeton University and New York University
at Particles and Fields Seminar
Mon, 27 Dec 2021, 14:00
Sacta-Rashi Building for Physics (54), room 207
Observational capabilities of small-scale structures within galaxies has been increasing rapidly in recent years. New and exciting astrophysical data-sets now enable the identification of many such structures within our Milky Way and this data will grow substantially over the next decade. These structures include dwarf satellite galaxies orbiting our Galaxy, cold stream-like objects and other remnants of merger events with the Milky Way. The wealth of new data offers a novel probe of the dark matter components of these objects, allowing one to gain knowledge of the particle nature of the dark matter model itself. In this talk I will discuss a number of avenues with which to utilize the data to study dark matter structure and differentiate between classes of dark matter theories. I will show that satellite galaxies and remnants of merger events with the Milky Way, such as the Sagittarius Stream and dark matter disks from highly disrupted dwarfs, provide valuable information. A particularly interesting finding is that dark matter disks tend to alter the angular momentum of the stellar disk of our Galaxy in a predictable fashion, even for a collisionless cold dark matter model. The resulting tilting motion of the stellar disk will be observable with data from the Gaia Space Telescope and can be used to infer properties of the merger event and its dark matter content. I will highlight a number of results and discuss additional avenues which my group will pursue in upcoming years.
The seminar will be in hybrid format. Zoom link will be sent by email.
Created on 21-12-2021 by Palti, Eran (palti)
Updaded on 26-12-2021 by Palti, Eran (palti)