The blue boxes indicate the regions to be observed by AGES.
As the survey name suggests, our aim is to probe selected galaxy environments studying their properties through observations of atomic hydrogen. Hydrogen is the primary ingredient from which stars form and looking at the morphology and kinematics of the gas tells us a great deal about star formation and galaxy evolution. The survey uses the largest and most sensitive single-dish telescope in the world : the 305m radio dish located at Arecibo, Puerto Rico.
The red boxes mark the positions of the Virgo1 and Virgo2 AGES fields.
To enhance the telescope further, a new receiver called the Arecibo L-band Feed Array (ALFA) was installed in 2004. This can observe seven different parts of the sky at once, making sensitive, large-area sky surveys much quicker than was previously possible.
Regions covered by the AGES survey are shown above. The survey has been awarded 2000 hours of time on the Arecibo telescope over the next few years. By the end of the survey we will have covered 200 square degrees of sky in 14 diverse regions. Our sensitivity is such that we can detect a few million solar masses of gas at the distance of the Virgo Cluster, equivalent to a very faint dwarf galaxy. So far we have completed substantial observations for the NGC 628 group, the NGC 7332/7339 galaxy pair, the Abell 1367 cluster, the NGC7448 group and the Virgo Cluster.
Further information can be found at: http://www.naic.edu/~ages/.