PHANGS–ALMA Data Processing and Pipeline

We describe the processing of PHANGS–ALMA survey and present pipeline, a public software package that processes calibrated interferometric total power data into science-ready products. is large, high-resolution CO(2–1) emission from nearby galaxies. The observations combine ALMA's main 12 m array, 7 observations, use mosaics dozens to hundreds individual pointings. u − v data, imaging deconvolution, linear mosaicking, combining interferometer noise estimation, masking, product creation, quality assurance. Our pipeline has general design can also be applied Very Large Array ALMA other spectral lines continuum emission. highlight our recipe for deconvolution complex line which combines multiscale clean, single-scale automatic mask generation in way appears robust effective. emphasize two-track approach masking creation. construct one set "broadly masked" products, have high completeness but significant contamination by noise, another "strictly confidence exclude faint, low signal-to-noise assurance tests, supported simulations, demonstrate m+7 deconvolved recover flux significantly closer than alone. In appendices, we measure stability calibration test performance popular short-spacing correction algorithms.