|Time:||Thursday, December 13, 2018, 02:00pm|
|Title:||The Hot Circum-Galactic Medium|
|Speaker:||Dr. Jiangtao Li (Univ. of Michigan)|
Circum-galactic medium (CGM) represents multi-phase gases and other matters [e.g., cosmic rays (CRs), magnetic field, dust, etc.] beyond the galactic disk and bulge, but typically within the virial radius of their dark matter halos. This multi-phase CGM plays a key role in the co-evolution of galaxies together with their ecosystem, as a reservoir providing fuels to continue star formation and a depository of energy and metal-enriched materials ejected by various forms of galactic feedback [e.g., from AGN, massive stellar wind, or supernovae (SNe)]. As the most extended and volume filling phase of the CGM, the X-ray emitting hot gas potentially contains a large fraction of the galactic baryon and energy budgets; its origin, spatial distribution, dynamical state, as well as physical and chemical properties are thus critical in determining how the CGM interacts with the galaxies. I will summarize what we have learned about the hot CGM from the existing X-ray observations. I will also present brief prospects on future works on the hot CGM with the existing and forthcoming X-ray missions, as well as the multi-phase CGM observed in multi-wavelength observations and the CGM study at the high redshift universe.
He is currently an assistant research scientist at the department of Astronomy at the University of Michigan, Ann Arbor, MI, U.S.A..
He received his PhD in astronomy in 2010.06 from the astronomy department of Nanjing University, China, jointly supervised by Prof. Q. Daniel Wang in University of Massachusetts, Amherst and Prof. Yang Chen in Nanjing University.
He then did his postdoctoral research with Prof. Q. Daniel Wang at the department of astronomy at the University of Massachusetts, Amherst, MA, U.S.A. from 2010.09 to 2012.07, with Dr. Anne Decourchelle at Service d'Astrophysique, CEA, Saclay, France from 2012.07 to 2014.10, and with Prof. Joel N. Bregman at the department of Astronomy at the University of Michigan, Ann Arbor, MI, U.S.A. from 2014.11 to 2018.01.
Host: Prof. Wei Cui