Supernova Remnants in Magellanic Clouds
Summary
Supernova remnants (SNRs) in the Large and Small Magellanic Clouds provide an unparalleled laboratory for studying the late stages of stellar evolution and the interaction of explosive ejecta with the interstellar medium. Owing to the relatively close distances and low foreground extinction, these neighbouring dwarf galaxies allow high-resolution imaging and spectroscopy across the electromagnetic spectrum. Surveys in radio, optical and X-ray bands have established a census of more than thirty confirmed SNRs in the Small Magellanic Cloud and over fifty in the Large Magellanic Cloud, spanning ages from a few hundred to tens of thousands of years. Analysis of emission-line ratios (notably [S ii]/Hα and [O i]/Hα) and kinematic measurements reveal a broad range of shock velocities and ambient densities. Detailed abundance studies trace the nucleosynthetic yields of core-collapse and Type Ia explosions, while high-resolution mapping of filamentary structures and cavities elucidates how supernova feedback drives turbulence, heats gas and regulates star formation on galactic scales.
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Supernova Remnants in Magellanic Clouds publication trend
The graph below shows the total number of articles in supernova remnants in magellanic clouds across all publications each year (not limited to Nature Index journals).
Technical terms
Supernova remnant (SNR): The expanding debris and shock-heated gas left over from a supernova explosion.
H ii region: A cloud of ionised hydrogen around young, hot stars emitting copious ultraviolet radiation.
[S ii]/Hα ratio: The intensity ratio of sulphur to hydrogen emission lines, used to distinguish shock-excited gas from photoionised gas.
Sedov phase: A self-similar adiabatic expansion stage of an SNR where energy losses are negligible.
Shock-ionisation: The process by which fast-moving ejecta or winds heat and ionise ambient gas, producing characteristic emission lines.
References
- The supernova remnant population of the Small Magellanic Cloud. Astronomy & Astrophysics (2019).
- The Dark Energy Camera Magellanic Clouds Emission-line Survey. The Astrophysical Journal (2024).
- The Large Magellanic Cloud Supernova Remnant MCSNR J0550-6823. The Astrophysical Journal (2023).
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