Analysis of XMM-Newton Observations of Supernova Remnant W49B and Clues to the Progenitor

Abstract

W49B is a supernova remnant (SNR) discovered over 60 years ago in early radio surveys. It has since been observed over the entire wavelength range, with the X-ray morphology resembling a centrally-filled SNR. The nature of its progenitor star is still debated. Applying Smoothed Particle Inference techniques to analyze the X-Ray emission from W49B, we characterize the morphology and abundance distribution over the entire remnant. We also infer the density structure and derive the mass of individual elements present in the plasma. The morphology is consistent with an interaction between the remnant and a dense medium along the eastern edge, and some obstruction towards the west. We find a total mass of 130 $(\pm 16)$ M${}_{\odot }$ and an estimated ejecta mass of 1.2 $(\pm 0.2)$ M${}_{\odot }$. Comparison of the inferred abundance values and individual element masses with a wide selection of SN models suggests that deflagration-to-detonation (DDT) Type Ia models are the most compatible, with Fe abundance being the major discriminating factor. The general agreement between our abundance measurements and those from previous studies suggests that disagreement between various authors is more likely due to the choice of models used for comparison, rather than the abundance values themselves. While our abundance results lean toward a Type Ia origin, ambiguities in the interpretation of various morphological and spectral characteristics of W49B do not allow us to provide a definitive classification.

14 pages, 8 figures, 5 tables. Accepted to the Astrophysical Journal

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Cited by in corpus (10)

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• Chemical abundances in Sgr A East: evidence for a Type Iax supernova remnant
• Unusually high HCO+/CO ratios in and outside supernova remnant W49B
• Can the Fe K-alpha Line Reliably Predict Supernova Remnant Progenitors?
• Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance
• QUIJOTE scientific results -- V. The microwave intensity and polarisation spectra of the Galactic regions W49, W51 and IC443
• Simulating the shaping of point-symmetric structures in the jittering jets explosion mechanism
• Common envelope jets supernova with thermonuclear outburst progenitor for the enigmatic supernova remnant W49B
• An Exploration of X-ray Supernova Remnants in the Milky Way and Nearby Galaxies
• Probing the Diversity of Type Ia Supernova Remnants in 3-D Hydrodynamic Simulations with X-ray Spectral Synthesis