SIMBAD references

A new galactic supernova remnant has been found in the ROSAT X-ray All-Sky Survey data. The object has a near circular, centrally filled shape and a diameter of ∼15arcmin. The classification as SNR is confirmed by the existence of optical filaments, ring-like infrared emission and an elliptical radio source. The X-ray emission appears to be of thermal origin but the spectral fitting of the X-ray spectrum does not yield unambiguous results for the interstellar absorbing column density and the electron temperature of the plasma. Optical line ratio measurements indicate an expansion velocity of ∼500km/s, which supports the X-ray parameters of N_H∼5x10²¹cm^–2 and kT∼0.3keV. This suggests a distance of ∼5kpc, a Sedov-age of ∼8700years and an explosion kinetic energy of ∼1.6x10⁵⁰erg.