[Okc-wp4] Reminder: EO meeting this week on Thursday 24th

[Francesco Taddia]

TODAY!!!

> On 21 May 2018, at 13:28, Francesco Taddia <ftadd at astro.su.se> wrote:
> 
> Hi all,
> 
> two talks at the next EO meeting on Thursday 24th, 13:00, in the KTH meeting room (5th floor).
> Here speakers, titles and abstracts:
> 
> 1) Speaker: Magnus Axelsson
> 
> Title: Breaking the spectral degeneracies in black hole binaries with fast timing data
> 
> Abstract: The spectra of black hole binaries in the low/hard state are complex, with evidence for multiple different
> Comptonisation regions contributing to the hard X-rays, in addition to a cool disc component. However, it is difficult to
> constrain these components uniquely using spectral data alone. Using observations of Cygnus X-1, I will show that
> additional information from fast variability can break this degeneracy, and gives new insight into
> the physical processes active in the inner accretion flow.
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> 2) Speaker: Giovanni Camelio
> 
> Title: Disk formation from the collapse of a rotating neutron star
> 
> Abstract:
> An unstable rotating neutron star can collapse to a black hole.
> A particle in the Innermost Stable Circular Orbit (ISCO) of this black hole has
> the lowest possible angular momentum that prevents it to fall into the black hole.
> If the matter of the unstable neutron star has everywhere a specific angular
> momentum smaller than that of the ISCO, no particle will escape the collapse.
> Using this criterion, we estimate the mass of the disk that might form in a
> neutron star collapse for a variety of Equation Of States (EOSs).
> We find that for all considered EOSs the disk mass is too low to generate gamma
> ray bursts with significant energy.
> We checked our estimates with general relativistic dynamical simulations.
> 
> 
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> 
> cheers
> 
> /Francesco
> 
> 
> 
> 
> 
> 
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