Sky Subtraction for Deep Surface Photometry of the Intergalactic Light from Clusters of Galaxies

Details Sky Subtraction for Deep Surface Photometry of the Intergalactic Light from Clusters of Galaxies Sky Subtraction for Deep Surface Photometry of the Intergalactic Light from Clusters of Galaxies

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111.1444m&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 765, pp. 1444-1450.

Astronomy and Astrophysics

Astronomy

6

Galaxies: Photometry, Cosmology: Gravitational Lensing, Galaxies: Intergalactic Medium, Methods: Data Analysis, Techniques: Image Processing

Scientific paper

A new observing procedure and method of analysis of CCD observations are presented. The observing procedure maximizes the on-source time without the need for observing separate blank sky fields. It is shown that a substantial improvement in the correction of sky and detector systematics can be achieved by explicitly separating the sky subtraction from the calibration of the spatial gain variations of the CCD, or flat-fielding. When we perform the sky subtraction before flat-fielding, the requirements on the latter are not as stringent. We test this method with deep I-band images obtained under extremely challenging observing conditions. Because of the presence of illumination gradients due to moonlight, a flat field with an accuracy of better than 10% could not be obtained. Nevertheless, a sky subtraction with an accuracy of approximately 0.1% of the sky brightness was achieved over the whole mosaic.

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