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Based on a consensus recommendation of a Scientific Advisory Committee to the STScI Director Steven Beckwith, supported by planning documents from a local Working Group, the parameters below have been adopted for the HST/ACS Ultra Deep Field.

Pointing

The UDF will consist consists of a single ultra-deep field (412 orbits in total) within the CDF-S GOODS area. The pointing will be RA(J2000)=3 32 39.0 and Decl.(J2000)=-27 47 29.1 These coordinates have been were changed slightly in May 2003 due to guide star availability and implementation issues. We have attempted to include in the field both a spectroscopically confirmed z=5.8 galaxy and a spectroscopically confirmed type Ia SN at z=1.3. The pointing avoids the gaps with the lowest effective exposure on the Chandra ACIS image of CDFS.

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Relative Depth of UDF w.r.t other HST surveys

Survey

(1)

Camera + Filter

(2)

Pivot Lamdda

(3)

No. of Orbits

(4)

Lim AB Mag

(5)

Depth increase

w.r.t  the HDF

(6)

UDF

ACS, F435W (B)

4311.80

56

28.7

1.0

UDF

ACS, F606W (V)

5915.38

56

29.0

0.9

UDF

ACS, F775W (i)

7697.34

150

29.0

1.4

UDF

ACS, F850LP (z)

9103.29

150

28.4

N/A

GOODS

ACS, F435W (B)

4311.80

3.0

27.2

-0.7

GOODS

ACS, F606W (V)

5915.38

2.5

27.5

-0.8

GOODS

ACS, F775W (i)

7697.34

2.5

26.8

-0.8

GOODS

ACS, F850LP (z)

9103.29

5.0

26.7

N/A

HDF

WFPC2, F300W (U)

2992.0

-

26.98

-

HDF

WFPC2, F450W (B)

4556.47

-

27.86

-

HDF

WFPC2, F606W (V)

6001.06

-

28.21

-

HDF

WFPC2, F814W (i)

8001.61

-

27.60

-

ACS Phase II and Status

The phase II is accessible on the web as DD proposal 9978

Data will be were taken between September 24, 2003 and January 16, 2004.

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