Nicole Vogt » The Groth Survey Strip Spectroscopic Sample
The figure shown below displays the distribution of our spectroscopic survey
of the Groth Survey Strip, a rectangular region observed with HST+WFPC2 in
V606 and I814 and extending across 4 by 40 arc-minutes on the sky. This
region has been partially observed in HST+WFPC2 B at the top end, and has also
been observed in many ground-based optical and IR passbands. This diagram
contains a portion of our total redshift survey, lacking the last year's
redshifts.
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The primary plot shows the distribution of galaxies along the strip, versus redshift on the x axis. As we look back in redshift, the size of the region that we are sampling becomes larger and larger in co-moving size. Red points show galaxies in the general redshift survey, which extends down to I_AB = 24, while the blue points represent disk galaxies targeted to obtain spatially resolved velocity profiles. The yellow bands show regions of high overdensity, some extending quite far on the sky in co-moving distance.
The far right plot shows the distribution of the galaxies on the sky. We have observed the top end of the strip very thoroughly, targeted the bottom end next, and then filled in the central regions with less observing time (i.e. less galaxies were observed per unit area).
The lower plot is a histogram in redshift, showing the distribution of both the general redshift survey (red) and of the disk sample (blue). Peaks in the general survey are marked in yellow, as in the primary plot. We have omitted the galaxies in the sample at higher redshifts (sample extends to redshift z ~ 3).
The three-in-one display for the GSS sample survey was designed by Dr. A. C. Phillips at Santa Cruz - thanks Drew!