Catalogue Notes

Astrometry
The DEEP HDF astrometry page describes the procedure used in the astrometric solution.
I814 Magnitudes
The photometry for most objects results from integrating the light within circular apertures out to 3 arc sec, as described by Phillips et al. (1997). For the 51 compact galaxies that were analysed by Phillips et al. (1997) and Guzmán et al. (1997), the I814 magnitudes were recalculated using elliptical apertures out to 8 arc sec. In the database no discrimination between both measures is made at present.
V-I Colours
Colours in the HDF used the photometry available in the catalog of Version 1 Drizzled HDF images.
For the Flanking Fields, colours were obtained using Keck V band images . The latter was calibrated using HDF galaxies in common, as described by Phillips et al. 1997, ApJ 489, 543. To obtain (V606-I814) colours were it was necessary to calculate a transformation relating the V606 - I814 colours with V(LRIS)- V606, because of the different bandpasses of the LRIS V and HST V606 filters. This transformation, calculated by R. Guzmán, is shown in the figure below. The HST images were degraded until their seeing matched that of the ground-based images. The magnitude were then calculated using 1.12 arc sec. The transformation itself is denoted by the solid line in the plot. A postscript version of this plot is also available.

December 1999