GOODS Field Layout
Layout of the SIRTF GOODS fields. The red regions show the areas to be
covered by SIRTF IRAC (3.6 to 8 micron) observations. The color
saturation scales roughly with exposure time: we will acquire nearly
uniform 25 hour IRAC exposures over 10' x 16' fields, with an overlap
region roughly 10' x 4' with double (50 hour) exposure. In addition,
for the HDF-N GOODS field, we plan an ultradeep IRAC exposure
covering a pair of parallel 5' x 5' fields, with a total
exposure time of 75 hours, reaching a maximum of 100 hours
where the 50 hour strip overlaps the ultradeep fields.
The ultradeep IRAC observations are contingent upon in-flight
demonstration that systematics will not limit their sensitivity.
The SIRTF MIPS 24 micron fields are shown in blue, and closely
overlap the IRAC fields, with a nearly uniform exposure time of
10 hours. These observations are also contingent upon
on-orbit tests to quantify instrument performance and sky
confusion. The ultradeep (1 Msec) Chandra ACIS fields are
schematically outlined in green. Chandra roll angles are not
constrainted for the CDF-S, so the field is shown as a circle.
The HST HDF-N central WFPC2+NICMOS field is shown as a white
chevron; the surrounding WFPC2 flanking fields are not shown,
nor are WFPC2 pointings in the CDF-S.
Overlays of the SIRTF GOODS areas on the Chandra 1 Msec exposure maps.
The upper greyscale figures show exposure time maps for the Chandra
observations of the HDF-N and CDF-S. The darkest regions have
nearly 1 Msec of total exposure time. The HDF--N Chandra
observations will be increased to 2 Msec in CXO Cycle 3, with
an ultimate goal of reaching 5 Msec. The blue and red rectangles
show the approximate areas to be covered by the GOODS SIRTF
survey with the MIPS and IRAC instruments. The greyscales below
show the nominal exposure time maps for the SIRTF data. Note
the two "ultradeep" IRAC fields planned for the GOODS/HDF-N survey.
The grid of white boxes shows the tiling of HST/ACS fields
at one telescope orientation, superimposed on the Chandra
(outer greyscale) and SIRTF IRAC (inner greyscale) exposure
maps. The fields will be revisited approximately every 45 days
to enable a search for high redshift supernovae. The center inset
schematically shows how the rotated ACS pointings from alternate
visits will be tiled over the GOODS area. 15-16 ACS pointings
will be used to cover the 10'x16' GOODS area in each epoch.
Copyright © 2002 The Association of Universities for
Research in Astronomy, Inc. All Rights Reserved.