Oulun yliopisto


Juri Poutanen, Professor of Astronomy

Juri Poutanen

Group members
Research news
Curriculum Vitae
Astrophysical calculator
Cosmological calculator

HEAD in Stockholm
Publications and citations of Finnish Astronomers 1995-2007

Welcome to the high-energy astrophysics group. After 12 years in Oulu, we are now in the process of moving to Tuorla Observatory, University of Turku. This is almost in the tropics, since it lies at 60.4 degrees North only.

The astrophysics group studies accretion-powered high energy sources such as neutron stars and black holes as well as gamma-ray bursts. Our strength is the combination of observational and theoretical research. We are actively involved in the analysis of the data on accreting black holes, ultraluminous X-ray sources and accreting millisecond pulsars obtained with the X-ray and gamma-ray observatories such as RXTE, XMM-Newton, INTEGRAL and Fermi. We also develop theoretical models for boundary layers around neutron stars and super-Eddington accretion disks around black holes. We have pioneered theoretical modelling of the light curves from rapidly rotating neutron stars and have developed state-of-the-art computer code for modelling the radiative processes in relativistic plasmas. 

 We work on the analysis of the Fermi/LAT data from blazars, which are supermassive blackholes with relativistic jets pointing towards us and emitting most of the energy in the GeV range. We have found that their spectra have significant breaks in the GeV range that are well described by the absorption of the gamma-rays due to the photon-photon pair production on He II Lyman recombination continuum and lines. This has resolved a long-standing question of gamma-ray production and proved that gamma-rays are produced within the broad-band line region. We have also proposed a novel particle acceleration mechanism--"photon breeding"-- that operates in relativistic jets emanating from active galactic nuclei.

The official web site of the astrophysics group is astrophysics.fi
It contains information about the group members, publications, teaching, and a general introduction to the high-energy astrophysics in English and Finnish.

Finnish Doctoral Programme in Astronomy and Space Physics

Contact details:

Tuorla Observatory, University of Turku, Väisäläntie 20, FIN-21500 Piikkiö, Finland
Fax: +358-2 333 5070, GSM: +358-400-640684, E-mail: juri.poutanen at utu.fi

[Faculty of Sciences] > [Dept. of Physics ] >  [Astronomy] > [Astrophysics]