Astrophysics Seminar

Astrolunch: Doron Kushnir (Weizmann)

Sun, 28/06/2020 - 12:30 to 13:30

Title: An accurate and efficient numerical calculation of detonation waves in supernovae simulations reveals that sub-Chandra models are in tension with observations

Astrolunch: Sivan Ginzburg (Berkeley)

Tue, 26/05/2020 - 16:00 to 17:00

NOTE THE UNUSUAL TIMING!!
Title: Black Widow Evolution
Abstract: Black widows are millisecond pulsars with low-mass companions (~2% the mass of the sun) on short orbits of several hours. When the first black widow was discovered in 1988, it was proposed that its companion is the remnant of a main sequence star that had been evaporated by the pulsar’s high energy radiation. I will present new observations from the last decade that challenge this picture, and discuss how the growing population of black widows can be explained consistently.

Astrolunch (remote): Kartick Sarkar (HUJI)

Tue, 24/03/2020 - 12:30 to 13:30

Title: Complete evolution of a supernova remnant
Abstract: Understanding the supernovae remnants or shocks in general reveals a great deal about the interstellar medium (ISM) including hints to the galactic evolution. Dynamics and evolution of SN remnants is a classical problem and have been studied numerous times in the literature but never with a self-consistent atomic physics. In this talk, I will discuss our efforts to study the textbook problem but with a self-consistent chemical network that is coupled to hydrodynamics and radiative transfer.

Astrolunch: Adi Zitrin (BGU)

Tue, 19/05/2020 - 12:00 to 13:00

THE SEMINAR WILL EXCEPTIONNALLY BE AT 12:00
Title: Recent developments in strong lensing science: from cosmic telescopes to cosmic microscopes

Astrolunch: Ana Acebron (BGU)

Tue, 07/04/2020 - 12:30 to 13:30

Title: Exceptional lensing clusters in recent HST surveys
Abstract: Massive gravitational lensing galaxy clusters have recently been targeted with the Hubble Space Telescope (HST) within the RELICS and BUFFALO surveys. Such observations, with varying strategies regarding depth and area, allow us to detect galaxies which would otherwise be too faint as well as modelling the dark matter distribution in these foreground structures. I will present the main science cases and recent results from these lensing cluster observations.