CFHT MegaCam Two Deep Fields Imaging Survey (2DFIS) I: Overview
Binyang Liu, Wentao Luo, Martin Kilbinger, Shenming Fu, Ian Dell'Antonio, Liping Fu, Xian Zhong Zheng, Yi-fu Cai, Cheng Jia, Ning Jiang, Qinxun Li, Yicheng Li, Shurui Lin, Christopher J. Miller, Surhud S. More, Huiyuan Wang, Yibo Wang
TL;DR
This paper presents the Two Deep Fields Imaging Survey (2DFIS), a CFHT MegaCam program targeting a rotating cluster field RXCJ0110.0+1358 and a repeating FRB field FRB190417 to r ~ 26 mag in ugri for FRB host studies and cluster mass mapping via weak lensing. It describes the observing design and a data-processing workflow that combines the LSST Science Pipelines with CFHT adaptations to produce calibrated single-epoch images, multi-band coadds, and comprehensive source catalogs. The data products enable analyses of FRB host environments, cluster mass reconstruction, and related cosmological applications. As a first installment, the work lays the groundwork for future 2DFIS investigations and demonstrates a CFHT-focused, pipeline-driven approach to deep, wide-field imaging.
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.