J/A+A/377/442 Chandra Deep Field South: R-band photometry (Wolf+, 2001)
Deep BVR photometry of the Chandra Deep Field South from the COMBO-17 survey
Wolf C., Meisenheimer K., Dye S., Kleinheinrich M., Rix H.-W., Wisotzki L.
<Astron. Astrophys. 377, 442 (2001)>
=2001A&A...377..442W 2001A&A...377..442W
ADC_Keywords: Surveys ; Regional catalog ; Photometry, CCD ; Magnitudes ;
Galaxies, photometry
Keywords: techniques: image processing - techniques: photometric - surveys -
catalogs - quasars: general - X-rays: general
Description:
Table2 is based on an object list that was created by applying
SExtractor software to an R-band image coadded from 36 frames with
15070s total exposure time taken in October 1999 using the Wide Field
Imager at the MPG/ESO 2.2-m telescope on La Silla, Chile. The field
measures 31.5'x30', is centered on 03:32:25-27:48:50 and contains the
Chandra Deep Field South. The average PSF is on the order of 0.75".
The catalog contains 63501 objects found by SExtractor with S/N>3. It
has not been cleaned for spurious detection of false objects arising
from scattered light or diffraction spikes of extremely bright stars.
Using this object list aperture magnitudes 'Bmag', 'Vmag' and 'Rmag'
were measured on B-, V- and R-band images taken in October 1999. These
are listed with its errors. Additionally an aperture magnitude 'R2mag'
with its error is included that is taken from R-band imaging from
February 2000 with an exposure time of 8440s taken in 21 frames,
yielding a total exposure time in the R-band of 23510s=6.5h. The
10-sigma magnitude limits for point sources are Bmag=24.9, Vmag=24.6,
Rmag=25.1 and R2mag=24.8. The aperture magnitudes were calculated by
counting the flux in an aperture with a Gaussian weighting function of
1.3" width. The flux is scaled to the total flux expected for stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 95 63501 BVR photometry in a 31.5'x30' field
around the Chandra Deep Field South
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See also:
II/253 : Chandra Deep Field South: multi-colour data (Wolf+, 2004)
J/A+A/375/1 : IR obs. of Chandra Deep Field + HDF-South (Saracco+, 2001)
J/A+A/384/81 : ESO Imaging Survey. CDF-S point sources (Hatziminaoglou+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Sequential number
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 18 F6.3 s RAs Right ascension (J2000) (1)
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000) (1)
33- 38 F6.3 mag Bmag ? Aperture magnitude in B (2)
40- 44 F5.3 mag e_Bmag ? Mean error (sigma) of Bmag
46- 51 F6.3 mag Vmag ? Aperture magnitude in V (2)
53- 57 F5.3 mag e_Vmag ? Mean error (sigma) of Vmag
59- 64 F6.3 mag Rmag ? Aperture magnitude in R (2)
66- 70 F5.3 mag e_Rmag ? Mean error (sigma) of Rmag
72- 77 F6.3 mag R2mag ? Aperture magnitude in R (3)
79- 83 F5.3 mag e_R2mag ? Mean error (sigma) of R2mag
85- 91 F7.3 mag ApCmag ? Aperture correction (4)
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Note (1): Internal accuracy ±0.15"
Note (2): From observations in October 1999, scaled to total flux for stars
Note (3): From observations in February 2000, scaled to total flux for stars
Note (4): The fluxes of extended objects are approximated by an aperture
correction : stars have a aperture correction close to zero while
extended objects reach down to negative values;
values below -100 have been removed.
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Acknowledgements:
Klaus Meisenheimer
(End) Martina Kleinheinrich [Max-Planck-Institut fuer Astronomie] 21-Jun-2001