AAOmega Data Reduction

The AAT and AAO-MQ supported 2dfdr software package handles basic reduction of AAOmega data. 2dfdr takes raw files from the telescope and extracts wavelength calibrated spectra for each fibre of 2dF.

A description of the data reduction process is included in the 2dF-AAOmega Manual under "Part IV: Data Reduction using 2dfdr".  Additional help with data reduction is available from your support astronomer (for visitor mode programs) or the instrument scientist (for service mode programs).

Depending on a particular program's science goals, additional processing may be required on the part of the astronomer. Such additional steps might include spectrophotometric flux calibration.  Users interested in measuring redshifts from their spectra may be interested in the AUTOZ program developed by Ivan Baldry.  More information is detailed in Baldry et al. (2014, MNRAS, 441, 2440).

Sample Data

Below is a sample data set suitable for testing your copy of 2dfdr and your understanding of the data reduction process.

The data set is low resolution data (580V and 385R gratings) so the output spectra can be spliced to demonstrate the continuous wavelength coverage.

In addition to the object/science frames, the data set includes fibre flat fields and arcs for both blue and red cameras, and bias and dark frames for the blue camera.

Note that this data is from before the 2013/2014 detector upgrade, and therefore the blue data have many imperfections. The current detectors have very few defects. For this new data, bias and dark frames are not generally helpful to final data quality.

 2dF+AAOmega Sample Dataset