The AAOmega Spectrograph

The AAOmega spectrograph was successfully commissioned in January 2006. The spectrograph is a dual-beam system, with Blue and Red arms that cover the full wavelength range, 370nm to 850nm, or 470nm to 950nm using a redder dichroic, at low resolution and are tunable over these ranges at higher resolutions.

The AAOmega spectrograph is fed by one of two front-ends, either the Two Degree Field ("2dF") multi-object system or the SPIRAL integral field unit. These are described below:

The Two Degree Field system ("2dF") is the AAT's most complex astronomical instrument. It is designed to allow the acquisition of up to 392 simultaneous spectra of objects anywhere within a two degree field on the sky. It consists of a wide-field corrector, an atmospheric dispersion compensator and a robot gantry which positions optical fibres to 0.3 arcseconds on the sky.  A tumbling mechanism with two field plates allows the next field to be configured while the current field is being observed.

SPIRAL is a 512 element fibre-lenslet integral field unit (IFU). It has a field of view of 22.4 x 11.2 arcsec at a spatial resolution of 0.7 arcsec.

Proposal Preparation Tools

Observing preparation Tools

Reducing your data 

Information for Support Astronomers and expert users 

Resources for Instrument Astronomers 

The original 2dF observing system on which AAOmega is based was responsible for two large survey programs. The data for these are available from 2dF survey data.

Sarah Brough (