[Astro] Seminar 12/6

[Jesse Golden-Marx]

Hi Everyone,
      I just wanted to remind you all about today's seminar from Dr. Roland Timmerman at 3:45 in C12.  Following the seminar, we will have tea and cake in C10.  Please bring your mugs for tea.  Hope to see many of you there.

In peace,
Jesse
________________________________
From: Jesse Golden-Marx (staff)
Sent: Monday, June 10, 2024 9:12 AM
To: astro at nottingham.ac.uk <astro at nottingham.ac.uk>
Subject: Seminar 12/6

Hi Everyone,
      Our seminar speaker this week is Dr. Roland Timmerman (visiting from Durham).  He's arriving in Nottingham on Tuesday evening, so will be in the office all day.  If you are interested in meeting with him, please either let me know or stop by A108, where he'll be sitting.  If anyone is interested in joining for lunch (around 12:30 on Wednesday), please let me know by Tuesday evening.  As usual we can subsidize a few post-graduates to attend.

Roland's talk is titled: A fresh look on AGN feedback with the International LOFAR Telescope

The abstract is provided below.

On Wednesday, the timings of the events are:

Arrival ~ 10:00am
Lunch ~ 12:30pm
meet the speaker for postgrads at 15:00, finishing at 15:30
seminar at 15:45 in C12
post-seminar Tea and Cakes

Cheers,
Jesse and Luke



Abstract: Clusters of galaxies are the most massive gravitationally bound structures in our Universe and form the nodes of the Cosmic Web. In addition to the up to thousands of member galaxies, galaxy clusters are permeated by the hot ionized diffuse plasma of the intracluster medium (ICM), which forms the dominant baryonic component of the cluster. The ICM releases strong X-ray emission due to thermal bremsstrahlung, causing this medium to cool down. As the ICM cools down, it sinks down the gravitational well of the cluster and accretes onto the central galaxy. Here, it fuels the supermassive black hole located in the core of the galaxy, creating an Active Galactic Nucleus (AGN). This AGN subsequently produces two relativistic jets which shoot into the surrounding ICM to re-energize this medium, which prevents a runaway cooling event and moderates star formation. To understand the formation and evolution of galaxy clusters, it is critical to understand this feedback cycle. The LOw Frequency ARray (LOFAR) is one of the world's leading observatories at low radio frequencies. With its pan-European baselines reaching up to 2000 km in length, it is capable of achieving sub-arcsecond angular resolution at frequencies below 200 MHz. Recent developments of the Long Baseline Working Group have enabled the calibration of these baselines, unlocking the highest resolutions (~0.3 arcseconds) attainable with LOFAR. This has provided an unparalleled view of the radio sky, enabling a wide variety of research for the first time. In particular, the combination of high angular resolutions and excellent sensitivity at low frequencies is ideal for imaging active galactic nuclei and their jetted outflows. In this talk, I will present a brief overview of the ongoing technical work with the calibration of LOFAR followed by a variety of recent results, and I will finish with a brief outlook on LOFAR's future following the upcoming upgrade.






Jesse Golden-Marx, Ph.D.
Senior Research Associate

Centre for Astronomy & Particle Theory
School of Physics & Astronomy
University of Nottingham
University Park, Nottingham, UK
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