The 2dF positioner configuring a test field. The fibres run from the edge to locations corresponding to the target objects. (Click for full resolution image. Photo: Barnaby Norris)
The 2dF system is currently feeding the AAOmega spectrograph. This provides a powerful survey capability in the optical domain (0.37 to 0.95 μm) at low (1,000) to moderate (up to 10,000) spectral resolutions. An improved throughput fiber feed, with dual fibres for each target, will be installed to connect 2dF to both the HERMES spectrograph, and to AAOmega, in the coudé laboratory. (It is only intended to use one spectrograph at a time, although this is a mainly a limitation of the detector infrastructure, and having dual fibres does make simultaneous observation in the future a theoretical possibility.) Each 140 μm diameter fiber core covers 2 arcsecond on the sky. Two 400-fibre bundles (one for each field plate) will be connected to two interchangeable input slits in the HERMES slit assembly.