Europa spectral images of HCN, SO2, H2CO and CH3OH observed using ALMA

This dataset contains observations of Europa carried out using the Atacama Large Millimeter/submillimeter Array (ALMA) on four dates in 2021, using the Band 7 receiver. The targeted spectral lines included HCN ($J=4-3$; 354.505 GHz), H$_2$CO ($J_{K_a,K_c}=5_{1,5}-4_{1,4}$; 351.769 GHz), SO$_2$ ($J_{K_a,K_c}=5_{3,3}-4_{2,2}$; 351.257 GHz), observed at 122~kHz resolution, and CH$_3$OH ($J_K = 4_0 - 3_{-1}\ E$; 350.688 GHz), observed at 61 kHz resolution. The interferometric data were cleaned and imaged using CASA, with a pixel size of 0.02'' and a clean mask of 1.1''. The resulting spatial resolution is ~0.15 arcseconds.

The data includes FITS image cubes and PDF spectral maps for each molecule, on each observing date. See FITS headers for further details. For each PDF, the ALMA beam FWHM is indicated lower left (dot-dashed ellipse); upper right axes show physical distances in the plane of the sky, while lower left axes show the spectral units for each sub-panel.