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GOODS

ESO/GOODS Project

GOODS/EIS Release: Version 0.5

9 April 2002

Summary of reduced ISAAC fields	Data format
Overview and field layouts	Next data release
Notes on Version 0.5 Data Release	Data retrieval
Data processing method

This data release includes eight fully reduced VLT/ISAAC fields in J,H,K_s bands covering 50 arcmin² of the GOODS region in the Chandra Deep Field South (CDFS). These data were obtained as part of the ESO Large Programme LP168.A-0485(A) (PI: C.Cesarsky), and include four ISAAC fields observed in J & K_s bands as part of the ESO programmes 64.O-0643, 66.A-0572 and 68.A-0544 PI-ed by E.Giallongo, who kindly accepted to make part of these data public before the end of the proprietary period. Details of the on-going GOODS program at ESO are given at http://www.eso.org/science/goods/products.html .

Summary of reduced ISAAC fields

A preview of the individual ISAAC (J,H,K_s) fields is available in the following table; for an overview and field layout of this data release as well as other observations of CDFS/GOODS, see below.

Full mosaic
(8 ISAAC fields)

Preview

Field

Filter

Exp(h)

ZP(Vega)

N_frames

[Mosaic Icon]
Black&white J+H+K

[Mosaic Icon 2]
(J,H,K) color composite

GOODS_09

3.50

25.14

105

4.00

24.88

120

K_s

5.97

24.22

239

GOODS_10

3.40

25.05

5.03

24.60

151

K_s

5.78

24.09

208

GOODS_11

3.20

25.00

3.93

24.66

118

K_s

7.28

24.27

262

GOODS_14

3.50

25.13

105

3.87

24.68

116

K_s

6.05

24.31

242

GOODS_15

2.20

25.06

3.97

24.89

119

K_s

7.44

24.10

268

GOODS_16

2.95

24.70

3.97

24.65

119

K_s

7.94

23.64

286

GOODS_20

3.47

25.19

104

3.90

24.66

117

K_s

5.93

24.24

237

GOODS_21

4.20

25.14

126

4.80

24.67

144

K_s

5.95

24.20

238

Data in the J and K_s bands highlighted in yellow were obtained as part of programmes PI-ed by E.Giallongo in Periods 64, 66, 68.

Overview and field layouts

The 8 ISAAC fields which are part of this data release are superimposed onto a SOFI image (J+K) (part of a previous EIS data release).

Field layout of the planned ISAAC observations and other GOODS related observations (available or planned).

Each field is shortly named FNN
(e.g., F09 corresponds to GOODS_09).
Click onto the image to see it full size.

Click onto the image to see it full size, with description.

Breakdown of the Observing Blocks:

168.A-0485(A) [Cesarsky], 68.A-0544(A) [Giallongo], 66.A-0572(A), 64.O-0643(B)

Notes on Version 0.5 Data Release

Each field is the coaddition of N_frames images, it is photometrically and astrometrically calibrated and complies with the following Version 0.5 Release requirements:

Sky subtraction and source masking techniques ensure a flat photometric accuracy of 0.03 mag down to the faintest objects.
Absolute photometric accuracy (Zero Points): Photometric Standards, obtained as part of the "ISAAC Calibration Plan" on Paranal, were used to derive Zero Points (ZPs). We aknowledge Ranga-Ram Chary from the GOODS team for deriving photometric solutions. In one case (GOODS field 11/J-band), for which not enough standard stars were available, the ZP was boostrapped from previous SOFI/EIS data. Based on a comparison with independently derived ZPs from the EIS/SOFI Deep-2c data, we find field to field variations within 0.1 mag in J-band and within 0.2 mag in K_s-band. We do not have any independent comparisons for H-band at this time. Since we do not have a fully tested procedure to derive ZPs, we do not quote internal ZP errors in the headers (for this reason the keyword ZP_ERR is set to -1).
The airmass term in the photometric solution has been included in the ZP, so that mag(Vega)=-2.5*Log(flux)+ZP, where flux is the number of counts directly measurable the images (note that they are all normalized to 1 sec exposure).
Astrometric solutions for each field is based on a astrometric catalog derived from a WFI R-band image of the CDFS, which was locked on the USNO catalog. By comparing this astrometric solution with the SOFI/EIS Deep-2c field one, which was locked on the GSC2.1 catalog, we find RMS of 0.2 arcsec (or less) in all fields.

Data processing method

The ISAAC data have been homogeneously reduced using the EIS pipeline as described in Vandame et al. (astro-ph/0102300). Note that the problem reported in EIS data release pages has been fixed. This has been confirmed by comparing source catalogs extracted from SOFI and ISAAC images reduced by different groups using independent software.

Data format

Each FITS file in the release contains two extensions, the first one is the science frame, the second one is the weight map defined as a variance map (e.g. it should be used with SExtractor using the parameters: -WEIGHT_IMAGE weight_map.fits -WEIGHT_TYPE MAP_WEIGHT).

Note: Filenames of the 24 images retrievable from the archive are related to a time stamp. In order to associate these files to each GOODS field, this file can be used. For example, to rename the orginal filenames to more user friendly names one could use the unix command:

cat list_v05.txt | awk '{print "mv",$1,$2}' |csh

Next data release

Version 1.0 of all ISAAC data obtained until period P72, will be released in March 2004.
(See progress of observations)

Send comments to <goods@eso.org>
Last update: Mar 24, 2004