Discovery of a galactic supernova remnant with ROSAT

Details Discovery of a galactic supernova remnant with ROSAT Discovery of a galactic supernova remnant with ROSAT

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..28p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L28-L31.

Astronomy and Astrophysics

Astronomy

42

Rosat Mission, Shock Waves, Supernova Remnants, X Ray Sources, X Ray Spectroscopy, Astronomical Spectroscopy, Classifications, Sky Surveys (Astronomy), Spaceborne Astronomy, X Ray Imagery

Scientific paper

A previously unknown supernova remnant has been discovered during the Rosat X-ray all-sky survey. The remnant, which is of almost perfect spherical shape with a diameter of 108 arcmin shows an X-ray flux of 1.9 x 10 to the -10th erg/sq cm/s between 0.1 and 2.4 keV, ranking it among the 10 brightest galactic supernova remnants. Based on the Sedov analysis the progenitor star went off 25,000 yrs ago expanding into a very low density medium of 0.01 atoms/cu cm. Both the low interstellar matter density and the intervening photoelectric absorption result in a distance estimate of about 3 kpc, which would place the remnant in the interarm region between the local Orion arm and Perseus arm suggesting a type-I event for the supernova. The classification as a galactic supernova remnant has been confirmed by follow-up radio observations, which revealed a radio surface brightness about a factor of 4 lower than that of any remnant known so far. If low radio brightness is common to old remnants radio surveys may have missed a substantial number, impacting on previous estimates about the galactic supernova rate and the energy input to the interstellar medium.

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