2/10/2021

High Energy Seminar

Wednesday, February 10, 2021 - 12:30pm

Zoom

Webcast Link:

Zoom here (do not use the "Live Webcast" link - the YouTube channel will only archive the Zoom recording)

Special Note:

Zoom link here.

Magnetic-field structure and electron heating at collisionless shocks

Speaker:

Martin Pohl

Institution:

U. Potsdam/DESY

Visitor Schedule

Abstract

X-ray spectra taken downstream of shocks in, e.g., supernova
remnants indicate weak electron-ion equilibration, some of which may
arise at the shock itself and some during passage through the
downstream region. We performed particle-in-cell simulation of
quasi-parallel collisionless shocks to identify the electron heating
processes at play and to establish their efficacy. We identified four
processes and developed simple models of their heating contribution
and its dependence on the shock parameters. We also found a new
empirical relation that describes the level of magnetic-field
amplification as a function of the Mach number.

A first view at the core of A1668: offset cooling and AGN feedback

Speaker2:

Thomas Pasini

Institution2:

U. Hamburg

Visitor Schedule

Abstract

In this talk, I will present the results of a multi-wavelength analysis performed by means of new radio (VLA), X-ray (Chandra) and Halpha (VIMOS) observations of the cool-core cluster A1668. We find evidences of spatial offsets between the different gas phases and the central radio galaxy. Two putative cavities are detected and analysed, comparing the corresponding power with the state-of-the-art correlation between cavity power and cooling luminosity. The results suggest that offsets are not interrupting or preventing the cooling. Finally, we discuss possible scenarios that could explain the observed features and environment of A1668.

Event Status:

Active

High Energy Seminars

Submitted by cfdrupaladm on July 29, 2015 - 5:04pm

Time:
Wednesday 12:30 - 1:30 PM

Location:
Zoom

Organizing Committee:
High Energy Seminar Committee

Live Webcast:
Video

Events

Submitted by cfdrupaladm on July 29, 2015 - 12:32pm