Statistics – Applications
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1716n&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #17.16; Bulletin of the American Astronomical Society, V
Statistics
Applications
Scientific paper
Light echoes provide a valuable window into interesting stellar phenomena and serve as a sensitive probe of the structure and composition of the circumstellar and interstellar media. Using a new difference imaging technique, we have obtained deeper, more detailed images of the light echoes around SN 1987A than previously available. Difference imaging is normally necessary to separate light echoes from the sky background, due to their low surface brightnesses. This approach has traditionally relied on single light-echo free template image which is subtracted from each epoch. Generally, this template must be constructed. We have developed a new method, based on the NN2 algorithm of Barris et al. (2005), that produces images containing absolute light echo fluxes from individual epochs, without the need for an echo-free template (Newman & Rest 2006). Applications of this method to the light echoes around SN 1987A have yielded high-quality images that reveal new detail and faint structures. From these images we have measured new values for parameters of the rings, including a faint outer ring reflected from dust more than 1 kpc in the foreground of the supernova. Implications for the three-dimensional interstellar dust structure are considered.
Becker Andrew C.
Challis Peter
Clocchiatti Alejandro
Cook Kem H.
Damke Guillermo
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