J/A+A/462/553 EIS: optical deep public survey (Mignano+, 2007)
ESO imaging survey: optical deep public survey.
Mignano A., Miralles J.-M., Da Costa L., Olsen L.F., Prandoni I.,
Arnouts S., Benoist C., Madejsky R., Slijkhuis R., Zaggia S.
<Astron. Astrophys., 462, 553-563 (2007)>
=2007A&A...462..553M 2007A&A...462..553M
ADC_Keywords: Surveys ; Photometry, UBVRI
Keywords: catalogs - surveys - stars: general - galaxy: general -
radio continuum: general
Abstract:
This paper presents new five passbands (UBVRI) optical wide-field
imaging data accumulated as part of the DEEP Public Survey (DPS)
carried out as a public survey by the ESO Imaging Survey (EIS)
project. Out of the 3 square degrees originally proposed, the survey
covers 2.75 square degrees, in at least one band (normally R), and
1.00 square degrees in five passbands. The median seeing, as measured
in the final stacked images, is 0.97", ranging from 0.75" to 2.0". The
median limiting magnitudes (AB system, 2" aperture, 5σ detection
limit) are UAB=25.65, BAB=25.54, VAB=25.18, RAB=24.8 and
IAB=24.12mag, consistent with those proposed in the original survey
design. The paper describes the observations and data reduction using
the EIS Data Reduction System and its associated EIS/MVM library. The
quality of the individual images were inspected, bad images discarded
and the remaining used to produce final image stacks in each passband,
from which sources have been extracted. Finally, the scientific
quality of these final images and associated catalogs was assessed
qualitatively by visual inspection and quantitatively by comparison of
statistical measures derived from these data with those of other
authors as well as model predictions, and from direct comparison with
the results obtained from the reduction of the same dataset using an
independent (hands-on) software system. Finally to illustrate one
application of this survey, the results of a preliminary effort to
identify sub-mJy radio sources are reported. To the limiting magnitude
reached in the R and I passbands the success rate ranges from 66 to
81% (depending on the fields).
Description:
The subdirectory "cat" includes the science grade catalogs extracted
for each of the 3 regions (DEEP1, DEEP2, DEEP3), divided in 11 fields,
discussed in this paper and the log-files associated with each
catalog.
The catalog files are in FITS format containing the primary HDU and 4
tables (MASKS, FILTER, OBJECTS and FIELDS) with the format described
in Dietrich et al., 2006. The log files contain information about
parameters used in the extraction process as well as parameters for
quality assessment of the catalogs.
The subdirectory "ima" includes includes the science grade images
extracted for each of the 3 regions (DEEP1, DEEP2, DEEP3), divided in
11 fields, discussed in this paper and the log-files associated with
each image.
The images are in FITS format with two extensions, the first one
giving the actual image and the second one being a weight map.
The details of the field naming convention can be found at
http://www.eso.org/science/eis
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fields.dat 99 42 Fields (in 7 photometric bands)
deep1.dat 121 270434 deep1 field selected values, for guidance
deep2.dat 121 243525 deep2 field selected values, for guidance
deep3.dat 121 433540 deep3 field selected values, for guidance
desccat.dat 81 69 Content of file object in cat/*.fits files
cat/* . 84 *Science grade catalogs and corresponding logfiles
ima/* . 84 *Science grade images and corresponding logfiles
filter/* . 8 Transmissions of filters used
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Note on cat/*, ima/*: catalog or images are stored in FITS format
(extension .fits); log files are stored as gzipped tar files
(extension .tgz)
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See also:
J/A+A/379/740 : ESO Imaging Survey (EIS) (Arnouts+, 2001)
J/A+A/452/119 : EIS: infrared observations of CDF-S and HDF-S (Olsen+, 2006)
J/A+A/456/881 : EIS: infrared deep public survey (Olsen+, 2006)
Byte-by-byte Description of file: fields.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [DEEP]
5- 6 A2 --- Fld Deep field designation (Na)
8- 11 A4 --- Band Photometric band (G1)
13- 32 A20 --- Cat Catalog file name (in fits) (1)
34- 55 A22 --- Catlog Name of the tar.gz file containing the logs
as a series of image files, html and xml files
57- 76 A20 --- Image Image file name (in fits)
78- 99 A22 --- Imalog Name of the tar.gz file containing the logs
as a series of image files, html and xml files
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Note (1): Catalogues are stored as FITS files, with 4 extensions in
addition to the primary HDU:
-- MASKS 1 column
-- FILTER 4 columns - filter transmission and
response of the entire system
-- OBJECTS 69 columns - the actual object list
(columns described in the file "desccat.dat")
-- FIELDS 109 columns - general information about the field
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Byte-by-byte Description of file: deep1.dat deep2.dat deep3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [DEEP]
5- 6 A2 --- Fld Deep field designation (Na)
8- 11 A4 --- Band Photometric band (G1)
13 I1 --- --- [1] Field number
15- 19 I5 --- Seq Sequential number in Fld
21- 28 F8.4 mag magISO Isophotal magnitude in Band
30- 36 F7.4 mag magAUTO Kron-like elliptical aperture magnitude in Band
38- 48 F11.7 deg RAdeg Right ascension in decimal degrees, J2000
50- 60 F11.7 deg DEdeg Declination in decimal degrees, J2000
62- 68 F7.3 pix A Profile RMS along major axis
70- 76 F7.3 pix B Profile RMS along minor axis
78- 82 F5.1 deg Theta [-90,90] Position angle of major axis
84- 88 F5.3 --- Ell Ellipticity (1-B/A)
90- 93 F4.2 --- S/G Star/Galaxy classifier (0=galaxy, 1=star)
95-104 F10.3 pix FluxRad Fraction-of-light radii
106-121 A16 --- File Name of the FITS file containing the
complete data, in subdirectory cat
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Byte-by-byte Description of file: desccat.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Param Parameter name
21- 33 A13 --- Unit Unit of the parameter
34- 81 A48 ---- Expla Explanation of the parameter
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Byte-by-byte Description of file: filter/*
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Bytes Format Units Label Explanations
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1- 7 F7.2 nm lambda Transmission wavelength
9- 16 F8.5 --- T Tranmission value
18- 25 F8.5 --- lambdaR Response wavelength
27- 34 F8.5 --- R Response value
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Global notes:
Note (G1): The 7 photometric bands (also in the "filter" subdirectory) are:
in U : U841, U877
in B : B842
in V : V843
in R : R844
in I : I845, I879
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Acknowledgements:
Arturo Mignano, amignano(at)ira.inaf.it
(End) Patricia Vannier [CDS] 30-Jan-2007