Astrophysics Seminar

Prof. Dr. Romain Tesyssier

Location: 
Kaplun Building, seminar room, 2nd floor
Thu, 08/12/2011 - 12:30 to 15:00

Subject: "Radiative cooling, radiative transfer and chemistry" Subject: "Adaptive Mesh Refinement"

"Astrophysics Seminar: Simulating non standard-cosmologies / Constrained simulations of the local Universe"

Location: 
Kaplun building, Room No. 200
Tue, 11/11/2014 - 12:30 to 13:30

Lecturer: Dr. Edoardo Carlesi Affiliation: Racah Institute of Physics, Hebrew University of Jerusalem Abstract: In the first part of this introductory talk I will describe my PhD work on N- Body/Hydro simulations of non standard cosmological models (of interacting dark matter-dark energy), which I did under the supervision of prof. Alexander Knebe at the Universidad Autonoma in Madrid. After reviewing the key features of these models as well as their numerical implementation into an N-Body code, I will discuss the main differences that could help distinguish these cosmologies

"Astrophysics Seminar: Evolving Galaxies across Cosmic Time: The Individual and Ensemble Perspective"

Location: 
Kaplun building, Room No. 200
Tue, 09/12/2014 - 12:30 to 13:30

Lecturer: Mr. Sandro Tacchella Affiliation: ETH Zurich Abstract: We have gained many new insights in the formation of the first galaxies at very high redshifts (z~8-10) and the major buildup of the most massive ellipticals, bulges and disks at the peak of cosmic star formation rate (z~2) in the last century. I will show how we need to study individual galaxies as well as the whole population to understand how galaxies form and evolve with time. I start with a simple model that links the galaxy properties to the underlying dark matter population and

Astrophysics Seminar: "The Black Hole - Bulge mass relation in Megamaser host galaxies"

Location: 
Kaplub building, Room No. 200
Tue, 22/12/2015 - 12:30 to 13:30

Lecturer: Dr. Ronald Läsker Affiliation: University of Turku Abstract: In this talk, I will present revised scaling relations of masses (MBH) of Supermassive Black Holes (BHs) with galaxy and bulge properties, focusing on bulge masses (Mbul) in low-mass and late-type galaxies where the bulge is only a minor component. By means of HST/WFC3 optical and near-infrared data, we analyzed BH host galaxies with MBH precisely known by their nuclear Megamaser emission. Due to the superior image quality and detailed analysis techniques, we are able to decompose

"Astrophysics Seminar: Magnetars and the Neutron Star Zoo"

Location: 
Kaplun building, Room No. 200
Tue, 28/04/2015 - 12:30 to 13:30

Lecturer: Prof. Victoria Kaspi Affiliation: McGill University Abstract: The last decade has shown us that the observational properties of neutron stars are remarkably diverse. From conventional radio pulsars like that in the Crab nebula to the powerful "magnetars" that emit sudden bursts of X-rays and gamma-rays, from the so-called Isolated Neutron Stars to Central Compact Objects, observational manifestations of neutron stars are surprisingly varied, with most properties totally unpredicted. The challenge is to establish an overarching physical theory of

"Astrophysics Seminar: Electromagnetic counterparts of compact binary mergers"

Location: 
Kaplun building, Room No. 200
Tue, 17/02/2015 - 12:30 to 13:45

Lecturer: Dr. Kenta Hotokezaka Affiliation: Racah Institute of Physics Hebrew University of Jerusalem Abstract: In this talk, I will focus on a compact binary merger, which is one of the most promising sources for the next generation gravitational- wave (GW) laser interferometers such as advanced LIGO, advanced Virgo, and KAGRA. The follow-up observation of electromagnetic (EM) counterparts will play an important role to confirm the event, to identify the host galaxy, and to study the nature of the GW sources. I will discuss mass ejection

Astrophysics Seminar: "Probing Core Magnetism in Stars via Asteroseismology"

Location: 
Kaplun building, Room No. 200
Tue, 01/03/2016 - 12:30 to 13:30

Lecturer: Prof. Lars Bildsten Affiliation: The Kavli Institute for Theoretical Physics, University of California, Santa Barbara Abstract: Additional details of the upcoming Astrophysics' seminars can be found on the following link. ‏האירוע הזה כולל שיחת וידאו ב-Google Hangouts.

"Astrophysics Seminar: Phenomenological model of radiatively efficient relativistic shocks"

Location: 
Kaplun building, Room No. 200
Tue, 07/07/2015 - 12:30 to 13:30

Lecturer: Prof. Evgeny Derishev Affiliation: Institute of Applied Physics, Nizhny Novgorod, Russia Abstract: We present a phenomenological model for emission from relativistic shocks. This model works best for those shocks, where dissipation of magnetic energy and radiative cooling of electrons take place on timescales shorter than the dynamical timescale. The model predicts that the ratio of synchrotron to inverse Compton emissivities is close to unity within the emitting region and that most of the IC radiation is absorbed in front of the shock and serves as a source of