Welcome to the Gaia-ESO archive at CASU

Gaia-ESO is a public spectroscopic survey, targeting ≥ 100,000 stars, sampling all major components of the Milky Way, from halo to star forming regions, providing the first homogeneous overview of the distributions of kine- matics and elemental abundances. This alone will revolutionise knowledge of Galactic and stellar evolution. When combined with Gaia astrometry the survey will quantify the formation history and evolution of young, mature and ancient Galactic populations.

From this archive you will be able to search and download processed data. Data are in multi-extension FITS files which contain both images with spectral data and tables with meta-data and derived information about each object. Processing information will all be written to the relevant FITS header. The database allows users to receive data in two forms:

• A FITS file with several image extensions and some table extensions. Each row in the image represents a spectrum taken in a particular OB. This may be a single exposure or it might be a summed (stacked) spectrum. But it will be all the spectra for a given configuration.
• A FITS file with a single image extension and several table extensions. This will be the format for a spectrum of a single object. Again, this may be from a single exposure of that object or a summed spectrum. There will be several versions of the spectrum representing different levels in the reduction.

In order to download data you need a username and password. If you don't have one please contact the project PI.