[Okc-wp4] EO meeting this Thursday

[Francesco Taddia]

Hi all,

here the speaker, the updated title and the abstract of the next EO talk, which will be this Thursday:

Speaker: Victor Mikhalev

Title:PoGO+ measurement of Crab emissions in the hard X-ray band.
 
Abstract: PoGO+ is a purpose-built and calibrated balloon borne polarimeter flown from the north of Sweden in the summer of 2016. The polarization of emissions from the Crab, as measured during the flight in 2016 is reported for the energy range (~20-160 keV). The Crab is a complex system consisting of a central pulsar, a diffuse pulsar wind nebula, as well as structures in the inner nebula including a jet and torus. Source and background observations are interspersed allowing for a rigorous background subtraction eliminating systematic effects. The polarization vector is found to be aligned with the spin axis of the pulsar for a polarization fraction, PF = (20.9 ± 5.0)%. Contrary to measurements at higher energies, no significant temporal evolution of phase-integrated polarisation parameters is observed. Through phase selections the off-pulse (OP) and pulsar (P1, P2) can be studied separately. The polarization properties of nebula dominated OP are compatible with the phase-integrated results. The polarization parameters for the pulsar itself (P2) are measured and are consistent with observations at optical wavelengths. Additionally, the instrument design and analysis methodology is detailed.



cheers

/Francesco
-------------------------------------------
Francesco Taddia
Postdoctoral Researcher
Department of Astronomy
Stockholm University, Sweden
ftadd at astro.su.se <mailto:ftadd at astro.su.se>









> On 31 Aug 2017, at 13:26, Francesco Taddia <francesco.taddia at astro.su.se> wrote:
> 
> Dear all,
> 
> it is time to restart our extreme object meetings after the summer break.
> 
> Mark these first three dates on your calendar:
> 
> 1) Next Thursday, 7/9, Federica Bianco (Center for Urban Science and Progress
>  and NYU Center for Cosmology and Particle Physics) will talk about LSST and 
> the recent adventures of an astrophysicist in urban science.
> 
> 2) On 28/9, we will have a talk titled "Shedding new light on the Crab with polarized X-rays" by the PoGo+ collaboration.
> 
> 3) On 12/10 we want to have another EO meeting, and
> we kindly ask for volunteers to give a talk!
> 
> The meetings will be at 13:00-14:00, @ KTH meeting room on the 5th floor.
> 
> cheers
> 
> /Francesco
> -------------------------------------------
> Francesco Taddia
> Postdoctoral Researcher
> Department of Astronomy
> Stockholm University, Sweden
> ftadd at astro.su.se <mailto:ftadd at astro.su.se>
> 
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> -------------------------------------------------
> okc-wp4 at albanova.se mailing list

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