SMA PAWS: An SMA M51 CO Isotopologues Large Program

These data are part of an SMA large program (SMA PAWS), wide-area, multi-line mapping survey targeting the 12CO, 13CO, and C18O (2-1) lines in the 1.3 mm window across the full disk of the nearby spiral galaxy M51 (resolution 4-5″ at 230 GHz translating to 170 pc). SMA's PIs are Kazimierz Sliwa and Adam Leroy. Analysis of the survey data is being led by Jakob den Brok (CfA) and Maria Jesus Jimenez-Donaire (ONA). The core goals of SMA-PAWS, in combination with data from PAWS (12CO(1-0), PI: Eva Schinnerer; Pety et al. 2013) and SWAN (13CO(1-0), C18O(1-0), PI: Eva Schinnerer and Frank Bigiel; Stuber et al. 2024), is to constrain the CO excitation and chemistry across M51 and to constrain the local physical conditions of the gas using the wealth of information on CO isotopologue line emission. We have processed the data following the methodology adopted for the PHANGS-ALMA Large Program (Leroy et al. 2021). Details will be presented in den Brok et al. 2024. The repository provides the following data products: data cubes, noise-per-channel maps, and integrated intensity (moment-0) maps for all lines, plus intensity-weighted velocity (moment-1) maps, line width (FWHM, moment-2) maps, equivalent width maps, and peak temperature maps for 12CO(2-1) and 13CO(1-0) only. For each moment map, we provide the corresponding uncertainty map as well. All line moments are calculated within a mask generated from the high S/N CO(1-0) data. The following acknowledgment would be appreciated: “This work made use of data from the SMA-PAWS (den Brok et al., 2024).” Acknowledgment of the SMA-PAWS survey is also appreciated if data are used in public presentations.