Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7978l&link_type=abstract
HST Proposal ID #7978
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #7978 Extragalactic Astrophysics
Scientific paper
The STIS slitless grism survey can verify {or otherwise} the broad-band photometric redshift techniques at redshifts z > 5 by providing the first spectroscopically confirmed examples of very high redshift galaxies. Here we propose to determine redshifts of extremely faint galaxies in STIS grism spectra by means of broad-band redshift techniques and to verify these redshifts by identifying narrow-band emission, absorption, and continuum features in the same spectra. The deep STIS slitless grism images can detect galaxies as faint as AB{5835} 28.5, albeit at a signal-to-noise ratio of only S/N 0.3 per pixel. But integrated over a bandpass of, say, 250 pixels or 1250 Angstrom, a signal-to-noise ratio of S/N = 0.3 per pixel corresponds to a signal-to-noise ratio of S/N 5 per bandpass element, which is sufficient to derive ``photometric'' redshifts. We will apply a new optimal extraction method based on the exact two-dimensional spatial profiles of the spectra on the grism image, which are obtained from the direct image that accompanies every grism image. We expect more than 20 galaxies per field at redshifts z > 4 and more than three galaxies per field at redshifts z > 5.
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