Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397

Ohshiro, Yuken; Yamaguchi, Hiroya; Leung, Shing-Chi; Nomoto, Ken’ichi; Sato, Toshiki; Tanaka, Takaaki; Okon, Hiromichi; Fisher, Robert; Petre, Robert; Williams, Brian J.

doi:10.3847/2041-8213/abff5b

Cited by 19 publications

(14 citation statements)

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“…The observed solar Mn/Fe ratio in the Centaurus core and other systems indicate a significant contribution of SNeIa products to the Fe-peak elements. The latest hydrodynamic simulations (e.g., Leung & Nomoto 2018) predict that the extremely high-density core of near-𝑀 Ch SNeIa synthesises a higher fraction of neutronised isotopes like 55 Mn and 58 Ni than sub-𝑀 Ch ones, which is also confirmed by observational studies on SNIa remnants (e.g., Yamaguchi et al 2015;Ohshiro et al 2021).…”

Section: Abundance Pattern Of Fe-peak Elementssupporting

confidence: 54%

Chemical enrichment in the cool core of the Centaurus cluster of galaxies

Fukushima,

Kobayashi,

Matsushita

2022

Preprint

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Here we present results from over 500 kiloseconds Chandra and XMM-Newton observations of the cool core of the Centaurus cluster. We investigate the spatial distributions of the O, Mg, Si, S, Ar, Ca, Cr, Mn, Fe, and Ni abundances in the intracluster medium with CCD detectors, and those of N, O, Ne, Mg, Fe, and Ni with the Reflection Grating Spectrometer (RGS). The abundances of most of the elements show a sharp drop within the central 18 arcsec, although different detectors and atomic codes give significantly different values. The abundance ratios of the above elements, including Ne/Fe with RGS, show relatively flat radial distributions. In the innermost regions with the dominant Fe-L lines, the measurements of the absolute abundances are challenging. For example, AtomDB and SPEXACT give Fe = 0.5 and 1.4 solar, respectively, for the spectra from the innermost region. These results suggest some systematic uncertainties in the atomic data and response matrices at least partly cause the abundance drop rather than the metal depletion into the cold dust. Except for super-solar N/Fe and Ni/Fe, sub-solar Ne/Fe, and Mg/Fe, the abundance pattern agrees with the solar composition. The entire pattern is challenging to reproduce with the latest supernova nucleosynthesis models. Observed super-solar N/O and comparable Mg abundance to stellar metallicity profiles imply the mass-loss winds dominate the intracluster medium in the brightest cluster galaxy. The solar Cr/Fe and Mn/Fe ratios indicate a significant contribution of near-and sub-Chandrasekhar mass explosions of Type Ia supernovae.

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Section: Abundance Pattern Of Fe-peak Elementssupporting

confidence: 54%

Chemical enrichment in the cool core of the Centaurus cluster of galaxies

Fukushima,

Kobayashi,

Matsushita

2022

Preprint

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“…The abundance ratios of mature Type Ia SNRs with similar ages are also different from those of G306.3−0.9. Type Ia SNR 3C397 (Yamaguchi et al 2015;Leung & Nomoto 2018) does not show enhanced abundance ratios of Ca to other elements Ca/X but has a large Fe/Ca ratio (Safi-Harb et al 2005;Ohshiro et al 2021). W49B has been proposed as a Type Ia SNR (still under debate) and has a smooth abundance ratio trend of S/Si ∼ Ar/Si ∼ Ca/Si and Ca/Fe  1 (Zhou & Vink 2018;Siegel et al 2020).…”

Section: Comparisons With Other Type Ia Snrsmentioning

confidence: 99%

“…Statistically, Type Ia SNRs are more symmetric than CC SNRs in X-ray morphology (Lopez et al 2011), either due to a more symmetric explosion process or a more uniform environment. Nevertheless, a few SNRs with asymmetric morphologies have also been proposed to have a Type Ia origin, e.g., SNR 3C397 (Chen et al 1999;Yamaguchi et al 2015;Leung & Nomoto 2018;Martínez-Rodríguez et al 2020;Ohshiro et al 2021) and SNR W49B (Zhou & Vink 2018;Siegel et al 2020). It would be of interest to explore if the aspherical morphology resulted from an intrinsically asymmetric Type Ia explosion or a nonuniform ambient medium.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance

Weng

Zhou

Chen

et al. 2022

ApJ

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G306.3–0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newton and Chandra observation data. We divided the SNR into 13 regions and analyzed the spectra using two-temperature models (0.2 keV + 1 keV). Compared to the southwestern regions, the northeastern regions have higher metal abundances and a lower gas density. This suggests that the asymmetric morphology results from the nonuniform ambient environment. We found that neither Type Ia nor core-collapse SN models can account for the abnormally high abundance ratios of Ar/Si, Ca/Si, or the shape of the abundance curve. A comparison with the Ca-rich transient models suggests that G306.3–0.9 is likely to be the first identified Galactic Ca-rich transient remnant, although the theoretical production of element S is lower. We also note that the conclusion for the SNR’s origin relies on the measured abundance ratios and existing nucleosynthesis models. Between two groups of Ca-rich transient explosion models, we prefer the He shell detonation for an accreting white dwarf, rather than the merger of a white dwarf and a neutron star.

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“…The abundance ratios of mature Type Ia SNRs with similar ages are also different from those of G306.3−0.9. Type Ia SNR 3C 397 (Yamaguchi et al 2015;Leung & Nomoto 2018) does not show enhanced abundance ratios of Ca to other elements Ca/X but has a large Fe/Ca ratio (Safi-Harb et al 2005;Ohshiro et al 2021). W49B has been proposed as a Type Ia SNR (still under debate) and has a smooth abundance ratio trend of S/Si ∼ Ar/Si ∼ Ca/Si and Ca/Fe 1 (Zhou & Vink 2018;Siegel et al 2020).…”

Section: Comparisons With Other Type Ia Snrsmentioning

confidence: 99%

“…Nevertheless, a few SNRs with asymmetric morphologies have also been proposed to have a Type Ia origin, e.g. SNR 3C397 (Chen et al 1999;Yamaguchi et al 2015;Leung & Nomoto 2018;Martínez-Rodríguez et al 2020;Ohshiro et al 2021) and SNR W49B (Zhou & Vink 2018;Siegel et al 2020). It would be of interest to explore if the aspherical morphology resulted from an intrinsically asymmetric Type Ia explosion or a non-uniform ambient medium.…”

mentioning

confidence: 99%

Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance

Weng,

Zhou,

Chen

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

G306.3−0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newton and Chandra observation data. We divided the SNR into 13 regions and analyzed the spectra using two-temperature models (0.2 keV + 1 keV). Compared to the southwestern regions, the northeastern regions have higher metal abundances and a lower gas density. This suggests that the asymmetric morphology results from the non-uniform ambient environment. We found that neither Type Ia nor core-collapse SN models can account for the abnormally high abundance ratios of Ar/Si, Ca/Si, or the shape of the abundance curve. A comparison with the Ca-rich transient models suggests that G306.3−0.9 is likely to be the first identified Galactic "Ca-rich transient" remnant, although the theoretical production of element S is lower. We also note that the conclusion for the SNR's origin relies on the measured abundance ratios and existing nucleosynthesis models. Between two groups of Ca-rich transient explosion models, we prefer the He shell detonation for an accreting WD, rather than the merger of a white dwarf and a neutron star.

show abstract

Discovery of a Highly Neutronized Ejecta Clump in the Type Ia Supernova Remnant 3C 397

Cited by 19 publications

References 50 publications

Chemical enrichment in the cool core of the Centaurus cluster of galaxies

Chemical enrichment in the cool core of the Centaurus cluster of galaxies

Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance

Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance

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