Contact

For any technical issues, please contact Didier Vibert . For science related questions, contact Stéphane Arnouts.

Authors & Contributors

Early 2005, inspired by the work of Fernandez-soto et al. (1999), Bruno Milliard had the idea to use priors in visible band to better perform the GALEX DEEP fields photometry. Mireille Guillaume proposed to solve the Poisson likelihood with the EM algorithm and wrote with David Aymeric the first incarnation of the program. Mid 2005, the main IDL structure of the code has been written by Antoine Lllebaria. Early 2006, a basic complete working version has been tuned by Stéphane Arnouts. Mid 2006, additional modifications have been done by Benjamin Magnelli. December 2006, a big speed improvement has been done by David Schiminovich with a C version of the core of the EM algorithm. In 2007, Michel Zamojsky improved the prior information on the sources by including their deblended images (stamps). Since 2008, Didier Vibert took the management of the software project and Simon Conseil (funded by CNES) has worked on the software development: simulations, tests, data processing, quality analysis.

Input Data

• GALEX GR6

• CFHTLS T0007 data:

  Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/IRFU, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at Terapix available at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS.

References

The following references are available to cite this algorithm:

• [2010] Simon Conseil, Didier Vibert, Stéphane Arnouts, Bruno Milliard, Michel Zamojski, Antoine Llebaria, Mireille Guillaume, "EMphot: Photometric Software with Bayesian Priors. Application to GALEX.", 442, Astronomical Data Analysis Software and Systems XX (ADASSXX).
• [2009] Vibert, D., Zamojski, M., Conseil, S., Llebaria, A., Arnouts, S., Milliard, B., Guillaume, M., "Photometry in UV astronomical images of extended sources in crowded field using deblended images in optical visible bands as Bayesian priors"* in Computational Imaging VII, edited by Charles A. Bouman, Eric L. Miller, Ilya Pollak, Proceedings of SPIE Vol. 7246 (SPIE, Bellingham, WA 2009) 72460U.
• [2008] Llebaria A., Magnelli B., Arnouts S., Pollo A., Milliard B., Guillaume M., Multi-channel 2D Photometry with Super-resolution in Far UV Astronomical Images using Priors in Visible Bands, 2008, SPIE.
• [2006] Guillaume, M. , Llebaria, A., Aymeric, D., Arnouts,S., Milliard, B., 2006 SPIE, 6064, 332.

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