Faint Hope

Hope against Hope

In the penultimate chapter of the Bible, in the opening statement of the very last speech God makes in the whole of the Christian Scriptures, God says: "Behold I am making all things new" (Rev 21:5). The prophet sees the old heavens and the old earth the universe as it now is passing away, and new heavens and a new earth, God's new creation of all things, coming into being. It is not that God r...

WHY OPTICALLY–FAINT AGN ARE OPTICALLY–FAINT: THE Spitzer PERSPECTIVE

Optically–faint X-ray sources (those with fX/fR> 10) constitute about 20% of X-ray sources in deep surveys, and are potentially highly obscured and/or at high redshift. Their faint optical fluxes are generally beyond the reach of spectroscopy. For a sample of 20 optically–faint sources in CDFS, we compile 0.4–24 μm photometry, relying heavily on Spitzer. We estimate photometric redshifts for 17...

"Hope, Danger's Comforter": Thucydides, Hope, Politics

Faint galaxy surveys.

Various K band galaxy surveys have now established 2.2-m galaxy counts from K = 10 to K = 23. The K band counts rise slightly faster than a Euclidean slope to K = 17, at which point they turn over; beyond this magnitude, galaxies also become much bluer. Spectroscopic samples are available between K = 10 and 20 and show that the conventional distance laws hold rather precisely out to a redshift ...

The Faint Radio Sky