The Monogem Ring: A Nearby SNR Similar to the Local Bubble ?

Computer Science – Databases

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Galactic Center, Bar, Circumnuclear Matter, And Bulge, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., X-Ray, Artificial Earth Satellites, Supernovae

Scientific paper

The ``Monogem Ring'' is a large (D~25.0°), old (t~1.0×105 yr) supernova remnant (SNR) located above the Galactic plane close to the anti-center direction. The Monogem Ring (MR) has a very soft X-ray spectrum and is one of the most prominent features in the ROSAT All-Sky Survey R1+R2 Band (100-284 eV) map. The MR has been associated with the pulsar PSR 0656+14, which has a well-constrained distance from parallax measurements. Adopting a distance of 300 pc, we have modeled the MR as the remnant of a single SNe with an explosion energy of Eo = 0.2×1051 ergs, an initial ambient density of 5.2×10-3 cm-3, and an age of 8.6×104 yr. Comparison to multiple-SNe models of the Local Bubble indicate that the MR is a younger, less energetic explosion which went off in a lower density medium. We also present the first Suzaku spectrum of the MR ring which is consistent with a low-temperature (kT = 0.20 keV) plasma close to ionization equilibrium with a sub-solar O abundance.

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