Suzaku Analysis of the Supernova Remnant G306.3-0.9 and the Gamma-ray View of Its Neighborhood

Abstract

We present an investigation of the supernova remnant (SNR) G306.3$-$0.9 using archival multi-wavelength data. The Suzaku spectra are well described by two-component thermal plasma models: The soft component is in ionization equilibrium and has a temperature $\sim$0.59 keV, while the hard component has temperature $\sim$3.2 keV and ionization time-scale $\sim$$2.6\times 10^{10}$ cm${}^{-3}$ s. We clearly detected Fe K-shell line at energy of $\sim$6.5 keV from this remnant. The overabundances of Si, S, Ar, Ca, and Fe confirm that the X-ray emission has an ejecta origin. The centroid energy of the Fe-K line supports that G306.3$-$0.9 is a remnant of a Type Ia supernova (SN) rather than a core-collapse SN. The GeV gamma-ray emission from G306.3$-$0.9 and its surrounding were analyzed using about 6 years of Fermi data. We report about the non-detection of G306.3$-$0.9 and the detection of a new extended gamma-ray source in the south-west of G306.3$-$0.9 with a significance of $\sim$13$\sigma$. We discuss several scenarios for these results with the help of data from other wavebands to understand the SNR and its neighborhood.

9 pages, 6 figures and 3 tables, accepted for publication in MNRAS

References in corpus (3)

• Discriminating the Progenitor Type of Supernova Remnants with Iron K-Shell Emission
• Searching for Overionized Plasma in the Gamma-ray Emitting Supernova Remnant G349.7$+$0.2
• Detailed study of SNR G306.3-0.9 using XMM-Newton and Chandra observations

Cited by in corpus (6)

• Evolutionary Models for 43 Galactic Supernova Remnants with Distances and X-ray Spectra
• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• Ionization age of iron ejecta in the Galactic Type Ia supernova remnant G306.3-0.9
• Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance
• Long-term evolution of non-thermal emission from Type Ia and core-collapse supernova remnants in a diversified circumstellar medium
• A New Gamma-Ray Source in the Vicinity of the Galactic Supernova Remnant G306.3$-$0.9