Abundances in the Ejecta of Core Collapse Supernova Remnants, G350.1-0.3 and G349.7+0.2

Abstract

We present Suzaku results of the two Galactic supernova remnants (SNRs), G350.1-0.3 and G349.7+0.2. We find Al and Ni K alpha lines from both the SNRs for the first time, in addition to previously detected K-shell lines of Mg, Si, S, Ar, Ca and Fe. The spectra are well described by two optically thin thermal plasmas: a low-temperature (low-kT) plasma in collisional ionization equilibrium and a high-temperature (high-kT) plasma in non-equilibrium ionization. Since the low-kT plasma has solar metal abundances, it is thought to be of interstellar medium origin. The high-kT plasma has super-solar abundances, hence it is likely to be of ejecta origin. The abundance patterns of the ejecta components are similar to those of core-collapse supernovae with the progenitor mass of ~15-25 M_solar for G350.1-0.3 and ~35-40 M_solar for G349.7+0.2. We find extremely high abundances of Ni compared to Fe (Z_Ni/Z_Fe ~8). Based on the measured column densities between the SNRs and the near sky background, we propose that G350.1-0.3 and G349.7+0.2 are located at the distance of 9+/-3 kpc and 12+/-5 kpc, respectively. Then the ejecta masses are estimated to be ~13 M_solar and ~24 M_solar for G350.1-0.3 and G349.7+0.2, respectively. These values are consistent with the progenitor mass of ~15-25 M_solar and ~35-40 M_solar for G350.1-0.3 and G349.7+0.2, respectively.

9 pages, 6 figures, accepted for publication in PASJ

References in corpus (2)

• SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
• The (Re-)Discovery of G350.1-0.3: A Young, Luminous Supernova Remnant and Its Neutron Star

Cited by in corpus (17)

• The gas-to-extinction ratio and the gas distribution in the Galaxy
• Origin of central abundances in the hot intra-cluster medium - II. Chemical enrichment and supernova yield models
• Distances, Radial Distribution and Total Number of Galactic Supernova Remnants
• The Origin of the Iron-Rich Knot in Tycho's Supernova Remnant
• Discovery of Recombining Plasma in the Supernova Remnant 3C 391
• H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud
• X-ray bounds on cooling, composition, and magnetic field of the Cassiopeia A neutron star and young central compact objects
• Expansion and Age of the Supernova Remnant G350.1-0.3: High-Velocity Iron Ejecta from a Core-Collapse Event
• Long-term evolution of non-thermal emission from Type Ia and core-collapse supernova remnants in a diversified circumstellar medium
• Investigating the morphology of the supernova remnant G349.7+00.2 in the medium with a density gradient
• Searching for Overionized Plasma in the Gamma-ray Emitting Supernova Remnant G349.7$+$0.2
• On the origin of the asymmetry of the ejecta structure and explosion of G350.1$-$0.3
• An Exploration of X-ray Supernova Remnants in the Milky Way and Nearby Galaxies
• Discovery of new X-ray sources near the unidentified gamma-ray source HESS J1841-055
• The Black Hole Candidate Swift J1728.9$-$3613 and the Supernova Remnant G351.9$-$0.9
• Suzaku and Fermi view of the supernova remnant 3C 396
• Searches for continuous gravitational waves from young supernova remnants in the early third observing run of Advanced LIGO and Virgo