The first detection of weak gravitational shear in infrared observations: Abell 1689
The first detection of weak gravitational shear in infrared observations: Abell 1689
We present the first detection of weak gravitational shear at infrared wavelengths, using observations of the lensing cluster Abell 1689, taken with the SofI camera on the ESO-NTT telescope. The imprint of cluster lenses on the shapes of the background galaxy population has previously been harnessed at optical wavelengths, and …