Light Echoes of Ancient Supernovae in the Large Magellanic Cloud

Details Light Echoes of Ancient Supernovae in the Large Magellanic Cloud Light Echoes of Ancient Supernovae in the Large Magellanic Cloud

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...9e..17r&link_type=abstract

Supernovae: One Millennium After SN1006, 26th meeting of the IAU, Joint Discussion 9, 17-18 August 2006, Prague, Czech Republic,

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Scientific paper

In recent years, light echoes have been discovered around some nearby extragalactic supernovae well after the explosion, most notably the light echoes from SN 87A. However, to date no light echoes of historical SNe of Galactic or extragalactic origin have been discovered. In the SuperMACHO project, we have imaged the bar of the LMC repeatedly and used an automated pipeline to subtract point-spread function matched template images from the recent epoch images. The resulting difference images are remarkably clean of the constant (in time) stellar background and are ideal for searching for variable objects. Using these difference images, we have mapped the extensive light echo complex around SN 87A further out, and deeper, than has been previously possible. Besides the SN 87A light echoes, we found three other groups of light echoes associated with known supernova remnants (SNRs). These SNRs are three of the six youngest in the LMC, and are classified as likely SN Ia based on X-ray data (Hughes et al. 1995). By combining the position and apparent proper motions of the light echoes, we derive ages for the SNRs (Rest et al., Nature, 2005). Spectra of the light echoes taken with the GMOS spectrograph on the Gemini South telescope suggests that the explosion causing one of the SNRs was an overluminous Type-Ia supernova explosion.

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