A) Finding the first Black Holes in the Universe

The idea is that deep continuum searches for steep-spectrum sources
can lead to the discovery of the highest redshift quasars, i.e. those
where black holes lit up for the first time. An important question is
whether this happened concurrent with the first star formation or not
and whether BHs contributed to the epoch of reionization.

This requires large surveys and radio provides a unique and very
efficient filter to select the right targets. Disadvantage: optical
follow-up is required.

Here you want to maximize sensitivity at low frequencies and make a
deep (long-duration) survey. For the reasons mentioned above such a
survey requires more than one independent beam at the full array
sensitivity (this should be included in the requirements).  The long
baselines are required for follow-up observations to distinguish
starbursts from AGN. Simultaneous dual-frequency observations are
important for the classification of sources. The upper frequency
limit is not strict.

China: Grade 3
The basic survey is possible, however long baselines are missing and
independent survey beams are nor available.

Europe: Grade 4 
Baseline range and frequency coverage are only marginal but not
prohibiting - both can be improved. Independent beams are a big plus.

India: Grade 3
Independent survey beams are nor available.

Ozlens: Grade 3
Baseline range is marginal. Beams are not independent.

Ozcyli: Grade 5 
This assumes that the beams are steerable over a wide enough range to make
truly independent surveys possible.

USA: Grade 3
Independent survey beams are nor available.

Canada: Grade 2 
Independent survey beams are nor available and dual-frequency
observations are not possible.

Source: Heino Falcke, chair of WG5