Star Formation at Redshift One: Preliminary results from an H-alpha Survey

Details Star Formation at Redshift One: Preliminary results from an H-alpha Survey Star Formation at Redshift One: Preliminary results from an H-alpha Survey

2004-07-12

arxiv.org/abs/astro-ph/0407218v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in the proceedings of the XXXIXth Rencontres de Moriond "Exploring the Universe"

Scientific paper

We present the first successful demonstration of multi-object near-infrared spectroscopy on high redshift galaxies. Our objective is to address the true star formation history of the universe at z~1, a crucial epoch which some have suggested is the peak of star formation activity. By using H-alpha -the same robust star formation indicator used at low-z - redshifted into the J- and H-bands, we can trace star formation without the systematic uncertainties of different calibrators, or the extreme dust extinction in the rest-UV, which have plagued previous efforts. We are using the instrument CIRPASS (the Cambridge Infra-Red PAnoramic Survey Spectrograph), in multi-object mode, which has been successfully demonstrated on the Anglo-Australian Telescope (AAT) and the William Herschel Telescope (WHT). CIRPASS has 150 fibres deployable over \~40arcmin on the AAT and ~15arcmin on the WHT. Here we present preliminary results from one of our fields observed with the WHT: H-alpha detections of z~1 galaxies in the Hubble Deep Field North.

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