The Radio Properties of Brightest Cluster Galaxies
Mike Hogan
University of Waterloo
AGN feedback from Brightest Cluster Galaxies (BCG), is believed to
counteract runaway
cooling in galaxy clusters, mainly via the mechanical action of radio-emitting jets.
Radio
observations are therefore crucial for understanding the processes at play in
cluster cores.
Using a large volume of radio data across a wide range of spectral, spatial and
temporal
frequencies, we find striking environmental differences between BCGs hosted by settled
“cool-core” clusters, and those in more dynamically disturbed systems. Furthermore, a
significant subset of sources are found to exhibit very active radio cores that
often only
become apparent at higher radio frequencies. Tracing HI in absorption against these
bright cores is a powerful technique to uncover the neutral gas content in the
vicinity of
the central black hole, and I will finish by discussing our successful search for such
absorption, and the gas properties deduced.
Date: | Thursday, 8 October 2015 |
Time: | 11:30 |
Where: | Université de Montréal |
| Pavillon Roger-Gaudry, local D-460 |
Contact: | Julie Hlavacek-Larrondo |
|