Disclaimer

Tartarus (Version 3.1) is a significant improvement over the previous Versions 1 and 2. The 611 sequences for which products have been made available are complete in the sense that either: the target object was not detected, in which case an upper limit on GIS2 source counts is given; or the intended AGN target was detected and the data were fully analysed. The products available in Tartarus should be of publishable quality without the need for the data to be re-reduced. However, while every effort has been made to ensure the accuracy of the processing, the Tartarus Team cannot guarantee that the Tartarus products are entirely without errors.

Users of Tartarus products should, in particular, be aware of the rudimentary nature of the spectral fitting and the way in which source and background regions are defined.

For the fitting of spectra, Tartarus uses only a very simple absorbed or unabsorbed power-law model. Users are thus suggested to examine closely the spectral-fitting images and results to determine the validity of the best-fitting models. The best-fitting model parameters are not provided for those fits having a reduced-chi-squared greater than 15. Users are able to easily re-fit the spectra with an arbitrary model using the spectral files provided.

The source and background regions are, in general, defined automatically by the processing scripts. Images for all sequences have be visually examined, and, for some sequences, a "custom region" has been determined by-eye. The use of a custom region is noted in the list of warnings for each sequence. Users are suggested to examine the regions being used, and the Tartarus Team welcomes any suggestions regarding the definitions of these regions.