Soon to come is the Fibre Large Array Multi-Element Spectrograph (FLAMES), a project co-ordinated by ESO. It incorporates several complex components now being constructed at various research institutions in Europe and Australia.

One of these, a true technological feat, is a unique system of 15 deployable fiber bundles, the so-called Integral Field Units (IFUs). They can be accurately positioned within a sky field-of-view measuring no less than 25 arcmin in diameter, i.e., almost as large as the full Moon.

Each of the IFUs looks like an insect's eye and images a small sky area (3 x 2 arcsec2) with a multiple microlens. From each IFU, 20 narrow light beams are sent via optical fibres to an advanced spectrograph. All 300 spectra are recorded simultaneously by a sensitive digital camera.

A major advantage of this technique is that, contrary to the usual spectroscopic observations in which spectral information is obtained along a one-dimensional line on the sky, it now allows two-dimensional area spectroscopy.

This will permit extremely efficient spectral observations of many celestial objects, including faint galaxies, providing detailed information about their internal structure and motions. Such studies will have an important impact on our understanding, e.g., of the early evolution of galaxies, the main building blocks in the Universe.

The IFUs have been developed by a team of astronomers and engineers at the Observatoire de Paris-Meudon. All IFU components are now at the ESO Headquarters in Garching (Germany) where they are being checked and integrated into the instrument.

Related images:

The Giraffe Spectograph at ESO headquarters

Simulated observation with Integral Field Units

How the IFUs Function

IFU design

Simulated observed velocity field


[Contact: Francois Hammer, Gerardo Avila, Richard West]

31-Jan-2002