Seminar on “High-Energy Cosmic Ray Acceleration in Relativistic Jets”

Artistic impression of a super-massive black hole with relativistic jets. Credit: ESA/NASA/AVO/Padovani

Guest: Dr. Athina Meli, Department of Physics and Astronomy, University of Gent, Belgium

When: Wednesday, March 22nd, 2017, from 11h00

Where: Institute of Space Science (Auditorium)

Abstract:

The Fermi acceleration mechanism at shocks is invoked to explain non-thermal cosmic-rays in Supernova Remnants, Active Galactic Nuclei Jets and Gamma ray Bursts. The importance of achieving the highest observed cosmic-ray energies by such a mechanism in extragalactic astrophysical environments is a recurring theme. Moreover, relativistic shocks, either single or multiple, have been inferred by observations to be forming within a high-speed plasma jet in extragalactic, relativistic sources. The acceleration of cosmic-rays via the Fermi acceleration mechanism in these shocks is believed to be responsible for the observed cosmic-ray power-law distributions and consequently for the radiation of gamma-rays and neutrinos. In this talk, I will focus on the relativistic cosmic-ray shock acceleration mechanism by giving an overview, will present Monte Carlo test-particle simulation studies for relativistic single and multiple shocks, and will briefly discuss the secondary production and extragalactic propagation of the accelerated high-energy cosmic-rays, giving some insights of their relevance to a multi-messenger physics approach.

Contact person: Ioana Duțan <idutan [at] spacescience [dot] ro>

 

“ISS Talks” with Prof. Henric Krawczynski from Washington University in Saint Louis and McDonnell Center for the Space Sciences

IMG_9117
Image credit: Washington University in Saint Louis

Prof. Henric Krawczynski from Washington University in Saint Louis and McDonnell Center for the Space Sciences will hold the “X-Ray Spectropolarimetric Observations of Black Holes and Neutron Stars with X-Calibur” seminar on 18 June at 11 a.m. in the Studio Room, Tower Building.

Read more

Seminar on the effects of dust on the photometric parameters of disks and bulges in spiral galaxies

Spiral galaxy NGC 1232. Image credit: ESO
Spiral galaxy NGC 1232. Image credit: ESO

Dr. Bogdan Adrian Pastrav (the Astronomical Institute of Romanian Academy – AIRA, the Institute of Space Science – ISS) will hold the “The effects of dust on the photometric parameters of disks and bulges in spiral galaxies” seminar on Wednesday, 6 May 2015, starting 11 a.m., in the Studio Room (Tower building, second floor).

The seminar will focus on the results of a study made to quantify the effects of dust on the derived photometric parameters of disks (old and young stellar disks) and bulges: disk scale-lengths, axis-ratios, central surface-brightness, bulge effective radii, and Sersic indices.

Read more

Care este raza Schwarzschild a unei particule cuantice? ISS Talks cu Prof. Dr. Roberto Casadio de la Universitatea din Bologna

Casadio_RobertoPe 2 septembrie 2013, începând cu ora 11:00, Institutul de Științe Spațiale (ISS) organizează un colocviu ce îl are ca invitat pe Prof. Dr. Roberto Casadio de la Universitatea din Bologna. Prezentarea va aborda tema razei Schwarzschild a unei particule cuantice, fiind susținută în limba engleză. Colocviul are loc în Sala Studio din clădirea IFA, etajul 2.

Read more

Prof. Dr. Benjamin Harms, de la Universitatea din Alabama, USA susține la ISS un colocviu despre o teorie comprehensivă pentru energia întunecată, inflație și găuri negre

Marți, 4 iunie 2013, începând cu ora 11:00, Institutul de Științe Spațiale (ISS) organizează un colocviu ce îl are ca invitat pe Prof. Dr. Benjamin Harms de la Universitatea din Alabama, S.U.A.

Prof. Benjamin C. Harms (c) University of Alabama
Prof. Benjamin C. Harms (c) University of Alabama

Prezentarea se va ține în limba engleză. Sumarul se regăsește mai jos. Colocviul se adresează unui public avizat. Cei care doresc mai multe informații sunt rugați să trimită un email la Octavian Micu, octavian.micu at spacescience.ro.

Read more

Social Widgets powered by AB-WebLog.com.