EDP Sciences
Free access
Volume 401, Number 3, April III 2003
Page(s) 1023 - 1026
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030183

A&A 401, 1023-1026 (2003)
DOI: 10.1051/0004-6361:20030183

G0.087-0.087, a highly polarized flat spectrum filament near the Galactic CentreArc

W. Reich

Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
(Received 23 January 2003 / Accepted 31 January 2003 )

32 GHz observations with the Effelsberg 100-m telescope revealed a highly polarized Galactic Centre filament: G0.087-0.087, running parallel to the well-known Arc structure. It has a similar flat spectrum, but it is an order of magnitude weaker. G0.087-0.087 is about $2\farcm 5$ or 6.2 pc long and located at the western boundary of the expanding molecular cloud G0.11-0.11. This unusual cloud is also visible in X-rays and known to interact on its eastern periphery with the Arc. Acceleration of highly relativistic particles at the surface of G0.11-0.11 seems necessary to explain the properties of both structures. The new filament supports previous findings on the existence of a strong poloidal magnetic field throughout the Galactic Centre region.

Key words: Galaxy: center -- radiation mechanisms: non-thermal -- techniques: polarimetric

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© ESO 2003