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Title: SPATIAL DISTRIBUTION OF MG-RICH EJECTA IN LMC SUPERNOVA REMNANT N49B

Abstract

The supernova remnant (SNR) N49B in the Large Magellanic Cloud is a peculiar example of a core-collapse SNR that shows the shocked metal-rich ejecta enriched only in Mg without evidence for a similar overabundance in O and Ne. Based on archival Chandra data, we present results from our extensive spatially resolved spectral analysis of N49B. We find that the Mg-rich ejecta gas extends from the central regions of the SNR out to the southeastern outermost boundary of the SNR. This elongated feature shows an overabundance for Mg similar to that of the main ejecta region at the SNR center, and its electron temperature appears to be higher than the central main ejecta gas. We estimate that the Mg mass in this southeastern elongated ejecta feature is ∼10% of the total Mg ejecta mass. Our estimated lower limit of >0.1 M {sub ⊙} on the total mass of the Mg-rich ejecta confirms the previously suggested large mass for the progenitor star ( M  ≳ 25 M {sub ⊙}). We entertain scenarios of an SNR expanding into a nonuniform medium and an energetic jet-driven supernova in an attempt to interpret these results. However, with the current results, the origins of the extended Mg-richmore » ejecta and the Mg-only-rich nature of the overall metal-rich ejecta in this SNR remain elusive.« less

Authors:
;  [1]
  1. Box 19059, Department of Physics, University of Texas at Arlington, Arlington, TX 76019 (United States)
Publication Date:
OSTI Identifier:
22661369
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 834; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CURRENTS; ELECTRON TEMPERATURE; GRAVITATIONAL COLLAPSE; JETS; MAGELLANIC CLOUDS; MAGNESIUM; MASS; SPATIAL DISTRIBUTION; STARS; SUPERNOVA REMNANTS; X RADIATION

Citation Formats

Park, Sangwook, and Bhalerao, Jayant, E-mail: s.park@uta.edu. SPATIAL DISTRIBUTION OF MG-RICH EJECTA IN LMC SUPERNOVA REMNANT N49B. United States: N. p., 2017. Web. doi:10.3847/1538-4357/834/2/189.
Park, Sangwook, & Bhalerao, Jayant, E-mail: s.park@uta.edu. SPATIAL DISTRIBUTION OF MG-RICH EJECTA IN LMC SUPERNOVA REMNANT N49B. United States. doi:10.3847/1538-4357/834/2/189.
Park, Sangwook, and Bhalerao, Jayant, E-mail: s.park@uta.edu. Tue . "SPATIAL DISTRIBUTION OF MG-RICH EJECTA IN LMC SUPERNOVA REMNANT N49B". United States. doi:10.3847/1538-4357/834/2/189.
@article{osti_22661369,
title = {SPATIAL DISTRIBUTION OF MG-RICH EJECTA IN LMC SUPERNOVA REMNANT N49B},
author = {Park, Sangwook and Bhalerao, Jayant, E-mail: s.park@uta.edu},
abstractNote = {The supernova remnant (SNR) N49B in the Large Magellanic Cloud is a peculiar example of a core-collapse SNR that shows the shocked metal-rich ejecta enriched only in Mg without evidence for a similar overabundance in O and Ne. Based on archival Chandra data, we present results from our extensive spatially resolved spectral analysis of N49B. We find that the Mg-rich ejecta gas extends from the central regions of the SNR out to the southeastern outermost boundary of the SNR. This elongated feature shows an overabundance for Mg similar to that of the main ejecta region at the SNR center, and its electron temperature appears to be higher than the central main ejecta gas. We estimate that the Mg mass in this southeastern elongated ejecta feature is ∼10% of the total Mg ejecta mass. Our estimated lower limit of >0.1 M {sub ⊙} on the total mass of the Mg-rich ejecta confirms the previously suggested large mass for the progenitor star ( M  ≳ 25 M {sub ⊙}). We entertain scenarios of an SNR expanding into a nonuniform medium and an energetic jet-driven supernova in an attempt to interpret these results. However, with the current results, the origins of the extended Mg-rich ejecta and the Mg-only-rich nature of the overall metal-rich ejecta in this SNR remain elusive.},
doi = {10.3847/1538-4357/834/2/189},
journal = {Astrophysical Journal},
number = 2,
volume = 834,
place = {United States},
year = {Tue Jan 10 00:00:00 EST 2017},
month = {Tue Jan 10 00:00:00 EST 2017}
}