Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extragalactic HI Surveys at Arecibo: the Future   Starting in the 1970s, the Arecibo 305m telescope has made seminal
contributions in the field of extragalactic spectroscopy. With the Gregorian
upgrade completed in the late 1990s, the telescope acquired a field of view.
Population of that field of view with a seven-feed array at L-band (ALFA)
increased by nearly one order of magnitude its survey speed. As a result, much
of the extragalactic astronomy time of the telescope is now allocated to survey
projects, which are briefly discussed. The next technical development stage for
the 305m telescope is foreseen as that of a 40 beam system that would take
advantage of phased array technology: AO40. This would further speed up the
survey performance of the telescope. It is shown how the figure of merit for
survey speed of AO40 would be comparable with that of SKA-precursor facilities,
planned for operation in the next decade. A number of scientifically desirable
new surveys that would become possible with AO40 are briefly discussed.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
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The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: physics
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The categories of this paper are: quant-ph