Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..363..184n&link_type=abstract
The Nature of V838 Mon and its Light Echo ASP Conference Series, Vol. 363, Proceedings of the conference held 16-19 May, 2006 in
Astronomy and Astrophysics
Astronomy
Scientific paper
Due to their faint surface brightnesses, difference imaging is necessary to separate most light echoes from the sky background. Difference images, however, provide only the relative fluxes between two epochs. Obtaining absolute fluxes for individual epochs has traditionally relied on a single template image free of light echoes. Generally this must be constructed, since such an observation is usually unavailable. Here we present an application of the NN2 method of tet{barris:nn2} to extract the relative fluxes of light echoes across a range of epochs from a series of difference images. This method requires no privileged image and makes maximal use of the observational data. Statistical methods to estimate the zero-flux level and thus the absolute flux are also presented. The efficacy of the technique is demonstrated by an application to the light echoes around SN 1987A.
Newman Andrew B.
Rest Armin
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