Physics Program and Dean of the College Present
Supermassive Black Holes and Exotic Physics in Galactic Nuclei
Friday, November 16, 2018
Hegeman 107
12:00 pm – 1:00 pm EST/GMT-5
12:00 pm – 1:00 pm EST/GMT-5
Shuo Zhang
Massachusetts Institute of Technology
Supermassive black holes (SMBHs) may spend the majority of their lives accreting at low rates through radiatively inefficient, advection-dominated accretion flow. Therefore, low-luminosity SMBHs could greatly outnumber their more active cousins, active galactic nuclei, thus are essential for our understanding of SMBH activity cycles and their relationship to galaxy evolution. In particular, SMBHs harbored in local galaxies are found to be remarkably under-luminous. The best studied under-luminous SMBH is the closest such object to Earth, Sagittarius A*, located in the nucleus of our Milky Way galaxy. In this talk, I will discuss how I have been probing the outburst history of Sagittarius A* and how I plan to apply these techniques to other SMBHs in nearby galaxies such as Andromeda. The Galactic nucleus of the Milky Way galaxy also serves as an ideal lab to probe exotic physics. I would like to introduce a new research direction of mine, to probe Galactic cosmic-rays at MeV through PeV energy scales. This research has far-reaching implications for a range of fields of study: the origin of Galactic cosmic-rays, particle acceleration mechanisms and dark matter searches, aiming to eventually answer the question whether Galactic cosmic-rays are from normal astrophysical sources or of more exotic origin such as dark matter annihilation.Massachusetts Institute of Technology
For more information, call 845-752-7302, or e-mail [email protected].
Time: 12:00 pm – 1:00 pm EST/GMT-5
Location: Hegeman 107