CFHT MegaCam Two Deep Fields Imaging Survey (2DFIS) I: Overview

TL;DR

The 2DFIS survey uses CFHT MegaCam to capture deep, wide-field images of two distinct regions, enabling studies of FRB environments and galaxy cluster mass distributions through advanced data processing and analysis.

Contribution

This paper introduces the survey's observing strategy, data processing workflow, and data products, tailored for CFHT/MegaCam, supporting diverse astrophysical research.

Findings

Deep imaging reaching r~26mag enables faint counterpart searches.

High-quality photometry and shape measurements facilitate weak-lensing analysis.

Comprehensive data products support studies of FRB environments and galaxy clusters.

Abstract

We present the Two Deep Fields Imaging Survey (2DFIS), a wide-field imaging program conducted with the Canada-France-Hawaii Telescope (CFHT) targeting two astrophysically distinct regions: one containing a repeating fast radio burst (FRB) source and another hosting a candidate of a rotating galaxy cluster. Achieving a depth of r~26mag, the survey enables a search for faint optical counterparts and environmental signatures associated with the FRB, while high-quality photometric and galaxy shape measurements in the cluster field support a weak-lensing analysis of its mass distribution. This paper describes the observing strategy and data processing methodology adopted for 2DFIS, including the use of the LSST Science Pipelines with survey-specific adaptations for CFHT/MegaCam data. We outline a complete workflow for transforming raw CFHT exposures into science-ready data products, including calibrated single-epoch images, multi-band coadded mosaics, and extensive source catalogs. These data products provide the foundation for ongoing and future studies of FRB host environments, cluster mass reconstruction, and related cosmological applications.