We report the results of a deep 3D imaging survey of the Hubble Deep Field North using the Taurus Tunable Filter and the William Herschel Telescope .
This survey was designed to search for new line emitting populations of objects missed by other techniques and to measure the cosmic star-formation rate density from a line-selected survey .
We observed in three contiguous sequences of narrow band slices in the 7100 , 8100 and 9100Å regions of the spectrum , corresponding to a cosmological volume of up to 1000 Mpc ^ { 3 } at z = 1 , down to a flux limit of \sim 2 \times 10 ^ { -17 } ergs cm ^ { -2 } s ^ { -1 } .
The survey is deep enough to be highly complete for low line luminosity galaxies .
Cross-matching with existing spectroscopy in the field results in a small line-luminosity limited sample , with very highly redshift identification completeness containing seven [ OII ] , H \beta and H \alpha emitters over the redshift range 0.3 – 0.9 .
Treating this as a direct star-formation rate selected sample we estimate the star-formation history of the Universe to z = 1 .
We find no evidence for any new population of line emitting objects contributing significantly to the cosmological star-formation rate density .
Rather from our complete narrow-band sample we find the star-formation history is consistent with earlier estimates from broad-band imaging surveys and other less deep line-selected surveys .