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Resolving SNR 0540-6944 from LMC X-1 with Chandra
The Astrophysical Journal
|June 13, 2000
Summary
Chandra observations reveal the supernova remnant SNR 0540-697 in the Large Magellanic Cloud. This study details its structure, temperature, and X-ray luminosity, providing new insights into this cosmic explosion.
Area of Science:
- Astronomy and Astrophysics
- X-ray Astronomy
Background:
- Supernova remnants (SNRs) are crucial for understanding stellar evolution and the interstellar medium.
- SNR 0540-697 in the Large Magellanic Cloud was previously obscured by the bright X-ray binary LMC X-1.
Purpose of the Study:
- To characterize the structure and spectrum of SNR 0540-697 using new Chandra X-ray data.
- To determine the physical properties and age of the supernova remnant.
Main Methods:
- Utilized data from the Chandra Advanced CCD Imaging Spectrometer for high-resolution X-ray imaging and spectroscopy.
- Analyzed X-ray emission to map the SNR's morphology and derive spectral parameters.
Main Results:
- Identified SNR 0540-697 as a thick-shelled structure approximately 19 pc in diameter.
- Observed a brightened region in the northeast sector of the remnant.
- Determined a plasma temperature of 0.31 keV and an X-ray luminosity of 8.4x10^33 ergs s^-1 (0.3-3.0 keV).
Conclusions:
- Estimated the age of SNR 0540-697 to be between 12,000 and 20,000 years.
- Acknowledged that environmental factors like cavity expansion could influence age estimates.
- The detailed X-ray analysis provides valuable data for understanding SNRs in the Large Magellanic Cloud.