G25.5 + 0.2 - A very young galactic supernova remnant

Details G25.5 + 0.2 - A very young galactic supernova remnant G25.5 + 0.2 - A very young galactic supernova remnant

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..613c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Dec. 1, 1989, p. 613-623. Research supported by th

Astronomy and Astrophysics

Astronomy

21

Extragalactic Radio Sources, H Alpha Line, Radio Emission, Supernova Remnants, Very Large Array (Vla), Astronomical Catalogs, Flux Density, H Ii Regions, Nonthermal Radiation

Scientific paper

Radio emission has been detected from a compact source which satisfies the criteria for a very young galactic supernova remnant. The source, G25.5 + 0.2 has a partially-filled shell structure, a total integrated flux density at 20 cm of 315 mJy, and a flat spectrum between 2 and 20 cm. Observations at 843 and 327 MHz indicate thermal absorption at low frequencies with a turnover in the spectrum near 1 GHz. It is suggested that the lower limit for the age of the supernova remnant is 25 yr, while the upper limit is about 100 yr. It is concluded that G25.5 + 0.2 could be the youngest known supernova remnant in the Galaxy.

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