Berlin 2005 – wissenschaftliches Programm

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EP: Extraterrestrische Physik

EP 20: Poster-Session III: Astrophysik

EP 20.4: Poster

Dienstag, 8. März 2005, 09:00–19:00, Poster TU BH

The radio halo of the starburst galaxy NGC 253 — •Volker Heesen¹, Marita Krause², Rainer Beck², Marian Soida³, and Ralf-Jürgen Dettmar¹ — ¹Astronomical Institute of the Ruhr-University Bochum, D-44780 Bochum, Germany — ²Max-Planck Institute for Radioastronomy, D-53121 Bonn, Germany — ³Astronomical Observatory of the Jagiellonian University, 30244 Krakow, Poland

We have conducted 3.6cm and 6cm radio continuum observations with with the Effelsberg 100m telescope. Additionally, we compiled 40h of filling time with the VLA in D-configuration. The polarized emission reveals a prominent radio halo with the magnetic field lines mainly aligned parallel to the disk. In the south-east of NGC 253 a huge spur dominates, where the magnetic field lines are along the spur. The radio spur coincides with a extension of flat spectral index from the disk into the halo. There, young accelerated cosmic ray (CR) electrons are advected by a collimated thermally driven galactic outflow (chimney). Estimating the magnetic field strength and the plasma β, we investigate the possibility of fast magnetic reconnection in the halo.