The Monogem Ring: A Nearby SNR Similar to the Local Bubble ?
Abstract
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.
- Publication:
-
The Local Bubble and Beyond II
- Pub Date:
- August 2009
- DOI:
- 10.1063/1.3211819
- Bibcode:
- 2009AIPC.1156..231P
- Keywords:
-
- 98.35.Jk;
- 95.80.+p;
- 95.85.Nv;
- 95.40.+s;
- 97.60.Bw;
- Galactic center bar circumnuclear matter and bulge;
- Astronomical catalogs atlases sky surveys databases retrieval systems archives etc.;
- X-ray;
- Artificial Earth satellites;
- Supernovae