CFHT UM2025 - Presentation Details
Abstract Details
Title: SIGNALS Data Release
Presenter: Carmelle Robert
Abstract:
We present new calibrations for SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, and more broadly for datacubes from the imaging Fourier transform spectrometer SITELLE at the CFHT. Using Gaia spectra, all SIGNALS datacubes (SN1, SN2, and SN3) are calibrated with bright stars in the field through a cumulative flux study. This method improves the flux accuracy to an average value of 20, 10, and 5%, for SN1, SN2, and SN3 respectively, and ensure relative calibrations between filters. All three datacubes are cleared from sky spectrum contamination, while they are realigned with sub-pixel precision relative to SN3 using a translation-rotation-affine deformation model based on well-defined bright stars within each filter. The datacubes from the same target are matched to the same seeing conditions to accurately produce line ratio maps. Noise maps, well adapted to the complexity of SITELLE, are also created. This process will be presented along with the revised version of the emission region detection code.