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: http://www.eso.org/science/goods/releases/20020408/
Дата изменения: Wed Mar 24 13:38:19 2004
Дата индексирования: Sun Sep 12 19:16:26 2010
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Поисковые слова: galactic cluster
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GOODS/EIS Release: Version 0.5
9 April 2002
This data release includes eight fully reduced VLT/ISAAC fields in
J,H,Ks 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 & Ks 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,Ks) 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 |
|
| GOODS_09 |
J |
3.50 |
25.14 |
105 |
H |
4.00 |
24.88 |
120 |
Ks |
5.97 |
24.22 |
239 |
| GOODS_10 |
J |
3.40 |
25.05 |
68 |
H |
5.03 |
24.60 |
151 |
Ks |
5.78 |
24.09 |
208 |
| GOODS_11 |
J |
3.20 |
25.00 |
64 |
H |
3.93 |
24.66 |
118 |
Ks |
7.28 |
24.27 |
262 |
| GOODS_14 |
J |
3.50 |
25.13 |
105 |
H |
3.87 |
24.68 |
116 |
Ks |
6.05 |
24.31 |
242 |
| GOODS_15 |
J |
2.20 |
25.06 |
44 |
H |
3.97 |
24.89 |
119 |
Ks |
7.44 |
24.10 |
268 |
| GOODS_16 |
J |
2.95 |
24.70 |
59 |
H |
3.97 |
24.65 |
119 |
Ks |
7.94 |
23.64 |
286 |
| GOODS_20 |
J |
3.47 |
25.19 |
104 |
H |
3.90 |
24.66 |
117 |
Ks |
5.93 |
24.24 |
237 |
| GOODS_21 |
J |
4.20 |
25.14 |
126 |
H |
4.80 |
24.67 |
144 |
Ks |
5.95 |
24.20 |
238 |
Data in the J and Ks bands highlighted in yellow were obtained as part
of programmes PI-ed by E.Giallongo in Periods 64, 66, 68.
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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).
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Field layout of the planned ISAAC observations and other GOODS related
observations (available or planned).
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Each field is shortly named FNN (e.g., F09 corresponds to GOODS_09).
Click onto the image to see it full size.
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Click onto the image to see it full size, with description.
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Breakdown of the Observing Blocks:
168.A-0485(A) [Cesarsky], 68.A-0544(A) [Giallongo], 66.A-0572(A), 64.O-0643(B)
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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.
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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 Ks-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)