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

Details G0.087-0.087, a highly polarized flat spectrum filament near the Galactic Centre Arc G0.087-0.087, a highly polarized flat spectrum filament near the Galactic Centre Arc

2003-02-18

arxiv.org/abs/astro-ph/0302348v1

Astron.Astrophys.401:1023-1026,2003

Astronomy and Astrophysics

Astrophysics

4 pages with 4 figures. Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030183

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 2.5' 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.

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