Other
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..466h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 466-470
Other
25
Astronomical Photography, Astronomical Photometry, Gravitational Lenses, Image Processing, Image Reconstruction, Algorithms, Charge Coupled Devices, Light Curve
Scientific paper
An image processing technique based on Lucy's algorithm (1974) was developed and tested on charge coupled device frames (CCD) of Q2237+0305 obtained at Observatoire du mont Megantic on 1990 July 27 in full width at half maximum (FWHM) approximately 1.5 sec seeing and on 1990 October 16 (FWHM approximately 1.7 sec). Magnitudes were successfully obtained for the four components of this image which all lie within 1 arcsec of the lensing galaxy nucleus. Historical light curves (1986-1991) are constructed for the four images with the implementation of a 'bootstrap' method. This also allows refinements to the estimates of differential extinction between the components and can detect microlensing events at the less than 0.1 mag level. The results of our photometry agree well with the trends defined by other observations taken in superior seeing at the same epoch.
Houde Martin
Racine Rene
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