_ Stockholm high energy astrophysics group
Oskar Klein Centre

Stockholm high energy astrophysics group

 
High energy astrophysics group

Introduction

Members

Research

Master's projects

Archive of untriggered gamma-ray bursts

Links

Supported by
Swedish National Space Board

The high energy astrophysics group in Stockholm is a joint group comprising researchers at the Department of Astronomy at Stockholm University and the Particle and Astroparticle Physics group at the Royal Institute of Technology (KTH). The group is active in both observational and theoretical aspects of high energy astrophysics, with emphasis on radiation processes in highly energetic plasmas. Astrophysical sources studied by the group include gamma-ray bursts, X-ray binaries, pulsars, and active galactic nuclei (AGN). Observations are both space-based (RXTE, Swift, Fermi) and ground-based (NOT, ESO). We frequently make use of the wealth of archival data available, especially for systematic studies. The group is a Co-Investigator for the Joint European X-ray Monitor (JEM-X) on Integral, and involved in the Fermi Gamma-ray Space Telescope. We also participate in the development and construction of the X-ray polarimeter PoGOLite.

The group forms part of the Oskar Klein Centre, a collaboration between researchers from the Departments of Astronomy and Physics at Stockholm University and the Physics Department at the Royal Institute of Technology. The Oskar Klein Centre was in 2008 awarded a Linnaeus grant for strong research environments by the Swedish Research Council.

News

2-5/4, 2009: 100 hours of Astronomy and AlbaNova open house
9-10/2, 2009: Extreme Astrophysics for All in Lund.
2009-01-01: International Year of Astronomy begins!
2008-10-30: Magnus Axelsson defends his doctoral thesis, "X-ray variability in Galactic high-mass black hole binaries"
2008-10-23: New results on two black hole binaries
2008-08-26: GLAST changes name to Fermi Gamma-ray Space Telescope as NASA unveils "first light" image.
2008-06-11: Linnea Hjalmarsdotter defends her doctoral thesis, "Spectral states and accretion geometries in Galactic black hole binaries" (at the University of Helsinki).

Recent publications

Below is a list of our recent publications. For earlier publications or a complete overview, we refer to astro-ph or NASA ADS.

M. Axelsson, S. Larsson, L. Hjalmarsdotter 2009, "The aperiodic broad-band variability of Cygnus X-3", accepted for publication in MNRAS.

L. Hjalmarsdotter, A.A. Zdziarski, A. Szostek, D.C. Hannikainen 2008, "Spectral variability in Cygnus X-3", MNRAS, in press.

T. Kamae, V. Andersson, M. Arimoto, M. Axelsson, et al. 2008, "PoGOLite - A high sensitivity balloon-borne soft gamma-ray polarimeter", Astroparticle Physics, 30, 72

M. Axelsson, L. Hjalmarsdotter, L. Borgonovo, S. Larsson 2008, "Vanishing hardness-flux correlation in Cygnus X-1: signs of the disc moving out", Astronomy & Astrophysics, 490, 253.

M. Kiss, S. Larsson, et al. 2008, "The PoGOLite balloon-borne soft gamma-ray polarimeter", in Cool Discs, Hot Flows: The Varying Faces of Accreting Compact Objects, AIPC 1054.

L. Hjalmarsdotter, A.A. Zdziarski, S. Larsson, et al. 2008, "The nature of the hard state of Cygnus X-3", MNRAS, 384, 278.

"Cool Discs, Hot Flows: The Varying Faces of Accreting Compact Objects", 2008, ed. M. Axelsson, AIPC 1054.


Send comments to magnusa@astro.su.se.

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