New Science Verification targets that will demonstrate the Band 2 receivers are now listed on the Science Verification webpage. The possible targets are G31.41+0.31, Arp 220, SPT 0027-50 and HR 5907. The data are planned to be taken with about 25 antennas and will be released for public use; the release of any Science Verification data will also be preceded by a similar announcement. Please visit the above web page for more information.
Targets for Band 2 Science Verification announced
Published: 19 Nov 2025
ALMA image of Arp 220 cores over HST image of Arp 220. Credit: L. Barcos-Muñoz, N. Lira, J. Pinto - ALMA (NRAO/NAOJ/ESO) / Hubble Space Telescope - (NASA/ESA).
Details of the possible observations are as follows:
- G31.41+0.31: spectral scan at 1 km/s from 67 GHz to 90 GHz to demonstrate imaging capability at ~0.4” angular resolution for line forests and capability to detect complex organic molecules.
- Arp 220: spectral scan at 10 km/s covering CO isotopologues (12CO, 13CO and C18O) and dense gas tracers (HCN, HCO+, HNC) to demonstrate imaging capability at ~0.4” angular resolution and science capability of tracing CO and dense gas tracers with the same band.
- SPT 0027-50: Spectral scan covering CO (4-3) and CO (3-2) (plus HCN, HCO+, HNC and CI (1-0)) at 10 km/s spectral resolution to demonstrate unique redshift identification at z = 3.444 via more than one CO transition.
- HR 5907: continuum full polarization observations to demonstrate the capability of detecting circular polarization and changes within the frequency range covered by Band 2 thanks to the increased fractional bandwidth.