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

TL;DR

This study analyzes the supernova remnant G306.3-0.9 using X-ray and gamma-ray data, revealing its Type Ia origin, ejecta composition, and a new gamma-ray source nearby, enhancing understanding of its properties and environment.

Contribution

It provides the first detailed multi-wavelength analysis of G306.3-0.9, identifying its supernova type and discovering a new gamma-ray source in its vicinity.

Findings

G306.3-0.9 is a Type Ia supernova remnant.

Detected Fe K-shell line indicating ejecta origin.

Found a new extended gamma-ray source near the remnant.

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\times10^{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.