IFPU Colloquium next week

[Rosanna Sain]

Dear All,

Next week William Forman and Christine Jones Forman from the 
Harvard-Smithsonian Center for Astrophysics will be visiting the IFPU 
and will be giving a double colloquium on Tuesday afternoon (details below).

They are world-renowned experts in X-ray cluster observations and they 
are eager to visit Trieste as they expect to meet many collaborators and 
friends. Researchers working on clusters and related fields are 
encouraged to spend some time between Monday and Wednesday at IFPU. We 
will circulate a similar email to the other institutes in Trieste.


Colloquia details:

*Location: Euler lecture room @ ICTP (!)*

*Time: 2:30pm*

*Christine Jones (Harvard-Smithsonian Center for Astrophysics)*

/Chandra, HST, and Radio Observations of Clusters of Galaxies
/
Clusters of galaxies are the most massive gravitationally bound objects 
in the Universe. While most of their mass is Dark Matter, the primary 
component of their visible matter is hot X-ray gas. A significant 
fraction of clusters are still growing through the infall of groups of 
galaxies or through the mergers of clusters. These cluster mergers are 
the most energetic events in the present Universe, after the Big Bang, 
releasing energies up to 10^64 ergs. Cluster mergers leave distinct 
signatures on the intracluster medium in the form of shocked gas and 
diffuse radio sources, relics. Most of the gravitational energy released 
during the merger is converted into shocks and gas turbulence in the 
cluster gas. This talk will highlight Chandra X-ray and radio results on 
the HST Frontier Fields clusters MACSJ017.5+3745, MACSJ1149.6+2223, and 
A2744, which are undergoing major mergers. Recent results on the merger 
of the A3411 and A3412 clusters show strong evidence for the electron 
re-acceleration at the merger site. Finally this talk will highlight 
results from the HST RELICS (Reionization Lensing Cluster Survey) which 
has led to the detection of very high redshift (z~10) galaxies which are 
strongly lensed by foreground clusters.


*Time: 4:00pm*
*
*
*William Forman (Harvard-Smithsonian Center for Astrophysics)
*
/Supermassive Black Holes (SMBH) at Work: The Effects of SMBH Outbursts 
on the Evolution of Gas Rich Galaxies, Groups, and Galaxy Clusters
/
Supermassive black holes (SMBHs) play key roles in galaxy and cluster 
evolution. This is most clearly seen in the "fossil record" that is 
imprinted in the gas rich atmospheres of early type galaxies, groups, 
and clusters by powerful SMBH outbursts. I will discuss the outburst 
history of M87 as chronicled in its radio and X-ray images and the 
implications of these outbursts for heating gas rich environments. Based 
on a simple shock model of M87's 12 Myr old outburst, I will present the 
properties of the outburst including its age, total energy, and 
duration. In addition to discussing the outburst around M87, I will 
review the results of a galaxy survey that shows the effects of SMBH 
feedback on early type galaxies and has interesting implications for the 
growth of SMBHs over cosmic time.  I conclude by describing a future 
X-ray mission, Lynx, whose sub-arcsecond angular resolution would allow 
us to study the evolution of SMBHs and hot, X-ray emitting atmospheres 
from high redshifts to the present.

**************************************