J/AJ/130/1 Catalog of source parameters in NICMOS UDF (Thompson+, 2005)
The near-infrared camera and multi-object spectrometer ultra deep field:
observations, data reduction, and galaxy photometry.
Thompson R.I., Illingworth G., Bouwens R., Dickinson M., Eisenstein D.,
Fan X., Franx M., Riess A., Rieke M.J., Schneider G., Stobie E., Toft S.,
Van Dokkum P.
<Astron. J., 130, 1-12 (2005)>
=2005AJ....130....1T 2005AJ....130....1T
ADC_Keywords: Galaxies, IR ; Photometry, HST
Keywords: cosmology: observations - galaxies: fundamental parameters -
galaxies: photometry
Abstract:
This paper describes the observations and data reduction techniques
for the version 2.0 images and catalog of the Near-Infrared Camera and
Multi-Object Spectrometer Ultra Deep Field (NICMOS UDF) Treasury
program. All sources discussed in this paper are based on detections
in the combined NICMOS F110W and F160W bands only. The NICMOS images
are drizzled to 0.09"/pixel and aligned to the Advanced Camera for
Surveys UDF F850LP image, which was rebinned to the same pixel scale.
These form the NICMOS version 2.0 UDF images. The catalog sources are
chosen with a conservative detection limit to avoid the inclusion of
numerous spurious sources. The catalog contains 1293 objects in the
144"x144" NICMOS subfield of the UDF. The 5σ signal-to-noise
ratio level is an average 0.6" diameter aperture AB magnitude of 27.7
at 1.1 and 1.6µm. The catalog sources, listed in order of right
ascension, satisfy a minimum signal-to-noise ratio criterion of
1.4σ in at least seven contiguous pixels of the combined F110W
and F160W image. Ten of the sources detected by the source extraction
program SExtractor (SE) are not included in the catalog, leaving 1283
of the 1293 detected sources.
Description:
The NICMOS observations in the UDF (HST GO/9803) are centered on the
position 3h32m39.0s, -27°47'29.1" (J2000.0) at approximately the
center of the ACS UDF observations. The NICMOS UDF program consists of
144 orbits broken into two epochs: (1) 2003 August 30-September 14 and
(2) 2003 November 2-November 27.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 244 1283 Catalog of source parameters
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See also:
II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)
J/AJ/112/1335 : Hubble Deep Field observations (Williams+ 1996)
J/AJ/117/17 : Hubble Deep Field near-IR obs. (Thompson+, 1999)
Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [TIB2005] Running source number
6- 10 I5 --- ACS Closest ACS I-band number (Cat. II/258)
12- 15 I4 --- SEG Identification in segmentation image
17- 23 F7.2 pix Xpos The X pixel coordinate in Treasury image
25- 31 F7.2 pix Ypos The Y pixel coordinate in Treasury image
33- 44 F12.8 deg RAdeg Right Ascension in decimal degrees (J2000)
46- 57 F12.8 deg DEdeg Declination in decimal degrees (J2000)
59- 63 F5.1 deg PA [-90/90] Position angle
68- 73 F6.3 --- Ell Ellipticity
76- 82 F7.3 pix Rh Half-light radius (1)
85- 91 F7.3 pix FWHM Full-width at half-maximum (1)
94- 97 F4.2 --- Stel Stellarity (2)
100-106 F7.3 mag 435mag ?=99. ACS F435W band isophotal magnitude
108-114 F7.3 mag e_435mag ?=99. Error in 435mag
116-122 F7.3 --- q_435mag Signal-to-noise in 435mag
124-130 F7.3 mag 606mag ?=99. ACS F606W band isophotal magnitude
132-138 F7.3 mag e_606mag ?=99. Error in 606mag
140-146 F7.3 --- q_606mag Signal-to-noise in 606mag
148-154 F7.3 mag 775mag ?=99. ACS F775W band isophotal magnitude
156-162 F7.3 mag e_775mag ?=99. Error in 775mag
164-170 F7.3 --- q_775mag Signal-to-noise in 775mag
172-178 F7.3 mag 840mag ?=99. ACS F840W band isophotal magnitude
180-186 F7.3 mag e_840mag ?=99. Error in 840mag
188-194 F7.3 --- q_840mag Signal-to-noise in 840mag
196-202 F7.3 mag 1100mag NICMOS F110W band isophotal magnitude
204-209 F6.3 mag e_1100mag Error in 1100mag
211-217 F7.3 --- q_1100mag Signal-to-noise in 1100mag
219-225 F7.3 mag 1600mag NICMOS F160W band isophotal magnitude
227-232 F6.3 mag e_1600mag Error in 1600mag
234-240 F7.3 --- q_1600mag Signal-to-noise in 1600mag
242-243 I2 --- Sflag Error flag returned by SExtractor
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Note (1): Where the pixels are 0.1". The NICMOS observations in the UDF
are centered on the position 03:02:39.0-27:47:29.1 (J2000.0)
at approximately the center of the ACS UDF observations.
Note (2): Returned by SExtractor, which is between 0 and 1 with 0 meaning
the object is definitely an extended object and 1 meaning it is
consistent with a star.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 18-Oct-2005