4.1 Article

ConvPhot: A profile-matching algorithm for precision photometry

Journal

NEW ASTRONOMY
Volume 12, Issue 4, Pages 271-288

Publisher

ELSEVIER
DOI: 10.1016/j.newast.2006.10.004

Keywords

methods : data analysis; techniques : image processing; techniques : photometric

Ask authors/readers for more resources

We describe in this paper a new, public software for accurate PSF-matched multiband photometry for images of different resolution and depth, that we have named ConvPhot, of which we analyse performances and limitations. It is designed to work when a high resolution image is available to identify and extract the objects, and colours or variations in luminosity are to be measured in another image of lower resolution but comparable depth. To maximise the usability of this software, we explicitly use the outputs of the popular SEx-tractor code that is used to extract all objects from the high resolution detection image. The technique adopted by the code is essentially to convolve each object to the PSF of the lower resolution measure image, and to obtain the flux of each object by a global chi(2) minimisation on such measure image. We remark that no a priori assumption is done on the shape of the objects. In this paper we provide a full description of the algorithm, a discussion of the possible systematic effects involved and the results of a set of simulations and validation tests that we have performed on real as well as simulated images. The source code of ConvPhot, written in C language under the GNU Public License, is released worldwide. (c) 2006 Elsevier B.V. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.1
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available