Revised 2-year plan for the UKIDSS GCS
N.C. Hambly on behalf of the GCS Working Group
August 2003
A revision of the plan for the UKIDSS GCS has been prompted by
- confirmation of availability of a WFCAM Z filter and new data concerning
the QE of Hawaii-2 detectors at short wavelengths resulting in increased
sensitivity estimates in the Z and Y bands;
- a small slip in the likely delivery date of WFCAM to Hawaii.
At an ad hoc meeting of the GCS Working Group in Cambridge on July 9th
2003, the following decisions were taken (full minutes of the meeting are
available at [1]):
- filter choice for all tragets is changed from JHKK to ZYJHKK, ie. a
50% increase in time requirement for the same areal coverage;
- final filter combinations are to be reviewed and optimised after the
first science frames have been analysed on a target-by-target basis,
ie. depending on factors such as target age, areal extent, distance and
reddening, one or more filters may be dropped for a given target;
- required areas to be kept as before; hence the lowest priority targets
fall outwith the current time allocations (2 yr and full plans) but may move
back in if filter coverage is revised (see previous item);
- IC 4665 is to be moved to priority 1 to fit in with the currently
projected start of WFCAM survey operations.
The revised two year plan is shown in Table 1.
Table:
Revised 2 year programme for the GCS. In practice, any given
pointing for the GCS will be observed at ZYJHK together or K only at
the two epochs (except for Orion where two epochs are not required). The
lowest priority targets 11 and 12 are currently outwith the two year plan
but may be reinstated if fewer filters are needed for any of the higher
priority targets in the final optimised programme (see text).
| Relative |
Target |
Bands/areas |
Time |
| priority |
|
(filters/sq.deg) |
(ks) |
| |
| 1 |
IC 4665 |
ZYJHK/0.8 |
0.83 |
| 2 |
Pleiades |
ZYJHK/79 |
83.3 |
| 3 |
Alpha Per |
ZYJHK/50 |
53.3 |
| 4 |
Praesepe |
ZYJHK/28 |
30.0 |
| 5 |
Taurus-Auriga |
ZYJHK/central 24 |
25.2 |
| 6 |
Orion |
ZYJHK/central 16 |
16.8 |
| 7 |
Sco |
ZYJHK/central 24 |
25.2 |
| 8 |
Per-OB2 |
ZYJHK/12.6 |
13.2 |
| 9 |
Hyades |
K only/291 |
61.0 |
| 10 |
Coma-Ber |
K only/78.5 |
16.5 |
| |
| |
|
2yr total: |
325.3 |
| |
| 11 |
Taurus-Auriga |
K only/remaining 362 |
76.0 |
| 12 |
Sco |
K only/remaining 130 |
27.3 |
| |
|
-
- 1
-
Minutes of the ad hoc GCS Working Group meeting at the IoA, Cambridge
on July 9th 2003;
http://www.roe.ac.uk/~nch/gcs/mins9jul03.txt
Revised 2-year plan for the UKIDSS GCS
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