Is the Cygnus Loop two supernova remnants?

Details Is the Cygnus Loop two supernova remnants? Is the Cygnus Loop two supernova remnants?

2002-05-25

arxiv.org/abs/astro-ph/0205443v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Astron. Astrophys., accepted

Scientific paper

10.1051/0004-6361:20020787

The Cygnus Loop is classified as a middle-aged supernova remnant (SNR) located below the Galactic equator (l=74, b=-8.6) and 770 pc away from us. Its large size and little confusion with Galactic emission makes it an ideal test ground for evolutionary and structural theories of SNRs. New radio continuum mapping of the Cygnus Loop at 2695 MHz with the Effelsberg 100-m telescope provides indications that the Cygnus Loop consists of two separate SNRs. Combining this result with data from the literature we argue that a secondary SNR exists in the south with a recently detected neutron star close to its center. Two interacting SNRs seem to be the best explanation to account for the Cygnus Loop observations at all wavelengths.

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