the Hyper Suprime-Cam
Subaru Strategic Program website
A unique component of HSC-SSP is a narrow-band survey of Deep and UltraDeep fields. A narrow-band filter is sensitive to emission lines at specific redshifts and it detected Halpha emission from the galaxy here located at z=0.24. The narrow-band image is in green and it nicely shows where the stars are being formed.
to unveil the nature of Dark Matter and Dark Energy