G359.87+0.18: A Young SNR Candidate Near the Galactic Center?

F. Yusef-Zadeh W. D. Cotton S. P. Reynolds

(1) Department of Physics and Astronomy, Northwestern University, Evanston, Il. 60208 (zadeh@nwu.edu) (2) National Radio Astronomy Observatory, Charlottesville, VA 22903 (bcotton@aoc.nrao.edu) (3) Physics Department, North Carolina State University, Box 8202, Raleigh, NC 27695-8202 (steve\reynolds@ncsu.edu)

Paper: to appear in ApJL

EPrint Server: astro-ph/9802361


Sub-arcsecond radio continuum observations of the Galactic center region at lambda 6 and 2cm reveal a 0.5'' diameter source with a shell-like morphology. This source is linearly polarized at a level of 16% at lambda 6cm and has a steep nonthermal spectrum with spectral index 1.6 between lambda 6 and 2 cm. The distance to this source is not known but the large rotation measure value of 3000 rad m-2 suggests that G359.87+0.18 is likely to be located in the inner Galaxy or at an extragalactic distance. We discuss possible interpretations of this object as a recent supernova, a very young supernova remnant, a nova remnant, or an extragalactic source. All possibilities are highly problematic.

Preprints available from the authors at ZADEH@OSSENU.ASTRO.NWU.EDU , or the raw TeX (no figures) if you click here.

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