J/ApJS/203/24 Structural parameters of galaxies in CANDELS (van der Wel+, 2012)
Structural parameters of galaxies in CANDELS.
van der Wel A., Bell E.F., Haussler B., McGrath E.J., Chang Y.-Y., Guo Y.,
Mcintosh D.H., Rix H.-W., Barden M., Cheung E., Faber S.M., Ferguson H.C.,
Galametz A., Grogin N.A., Hartley W., Kartaltepe J.S., Kocevski D.D.,
Koekemoer A.M., Lotz J., Mozena M., Peth M.A., Peng C.Y.
<Astrophys. J. Suppl. Ser., 203, 24 (2012)>
=2012ApJS..203...24V 2012ApJS..203...24V
ADC_Keywords: Galaxies, photometry ; Morphology ; Surveys
Keywords: catalogs - galaxies: high-redshift - galaxies: statistics -
galaxies: structure - surveys
Abstract:
We present global structural parameter measurements of 109533 unique,
HF160W-selected objects from the CANDELS multi-cycle treasury
program. Sersic model fits for these objects are produced with GALFIT
in all available near-infrared filters (HF160W, JF125W and, for a
subset, YF105W). The parameters of the best-fitting Sersic models
(total magnitude, half-light radius, Sersic index, axis ratio, and
position angle) are made public, along with newly constructed
point-spread functions for each field and filter. Random uncertainties
in the measured parameters are estimated for each individual object
based on a comparison between multiple, independent measurements of
the same set of objects. To quantify systematic uncertainties, we
create a mosaic with simulated galaxy images with a realistic
distribution of input parameters and then process and analyze the
mosaic in an identical manner as the real data.
Description:
In this paper we describe the measurements of structural parameters of
109533 unique objects in the Cosmic Assembly Near-infrared Deep
Extragalactic Legacy Survey (CANDELS) WFC3/IR data, representing
roughly 2/3 of the full survey. Our online materials will be updated
with the final 1/3 of the survey once observations have been completed
by the end of 2013. A full description of the CANDELS observing
program is given by Grogin et al. (2011ApJS..197...35G 2011ApJS..197...35G) and Koekemoer
et al. (2011ApJS..197...36K 2011ApJS..197...36K). CANDELS is a WFC3 and parallel ACS, 902
orbit HST imaging survey; here we concentrate on the WFC3 data only,
which cover 800arcmin2 and are distributed over five widely
separated fields (GOODS-S, GOODS-N, COSMOS, UDS and EGS).
In table 1, structural parameters for three fields are summarized,
namely, the UDS field (Lawrence et al. 2007MNRAS.379.1599L 2007MNRAS.379.1599L - see Cat.
II/314), the Cosmological Evolution Survey field (COSMOS; Scoville et
al. 2007ApJS..172....1S 2007ApJS..172....1S - see Cat. II/284) (both 9'x24' and each at
"wide" depth), and the GOODS-South field (GOODS-S; Giavalisco et al.
2004, Cat. II/261); "wide" is over 4'x10' and "deep" is over 7'x10'.
The CANDELS observations are augmented by previously obtained WFC3/IR
data from the ERS program (Windhorst et al. 2011ApJS..193...27W 2011ApJS..193...27W) in
the northern part of the GOODS-S field (4'x9' at a 2 orbit depth in
F098M, F125W, and F160W) and the UDF program (Bouwens et al.
2010ApJ...709L.133B 2010ApJ...709L.133B) embedded in the GOODS-S deep area (1 pointing
with ∼15 orbits in F105W and F125W, and 28 orbits in F160W).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 149 253996 GALFIT fitting results and derived uncertainties
table4.dat 59 6492 GALFIT fitting results for the F160W "wide"
sample in GOODS-South
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
VII/246 : GOODS Morphological Catalog (Bundy+, 2005)
II/261 : GOODS initial results (Giavalisco+, 2004)
J/ApJ/691/705 : AGN host galaxy morphologies in COSMOS (Gabor+, 2009)
J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009)
J/ApJ/689/687 : GOODS-N spectroscopic survey (Barger+, 2008)
J/ApJ/680/70 : Distant spheroids in the GOODS fields (MacArthur+, 2008)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
J/AJ/134/1103 : MUSYC deep near-infrared imaging (Quadri+, 2007)
J/ApJ/644/30 : HST Observations of 2 high-z clusters (Blakeslee+, 2006)
J/ApJ/635/243 : Sample of GOODS/CDFS early-type galaxies (Ferreras+, 2005)
J/ApJ/604/521 : Luminosities and masses of galaxies at z∼3 (Trujillo+, 2004)
J/AJ/125/1107 : Ultra-deep near-IR observation in HDF-S (Labbe+, 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Fld Field name (COSMOS, GOODSS or UDS)
8 A1 --- F [HJY] Filter (H, J or Y)
10- 14 I5 --- ID [1/38671] Identifier in Field using Filter
16- 25 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
27- 36 F10.6 deg DEdeg Declination in decimal degrees (J2000)
38 I1 --- Q [0/3] GALFIT model quality flag, 0=good (1)
40- 48 F9.4 mag mag ?=-999 Observed magnitude in filter "F"
50- 58 F9.4 mag e_mag ?=-999 Uncertainty in mag (2)
60- 68 F9.4 arcsec r ?=-999 Half-light semi-major axis
70- 80 F11.4 arcsec e_r ?=-999 Uncertainty in r (2)
82- 90 F9.4 --- n ?=-999 Sersic index
92-102 F11.4 --- e_n ?=-999 Uncertainty in n (2)
104-112 F9.4 --- q [0/1]?=-999 Projected axis ratio
114-122 F9.4 --- e_q ?=-999 Uncertainty in q (2)
124-130 F7.2 deg PA [-360/360]?=-999 Position angle (3)
132-140 F9.2 deg e_PA ?=-999 Uncertainty in PA (2)
142-149 F8.2 --- S/N [0/42095] Signal-to-noise ratio
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Note (1): Flag as follows (see Section 4.3 for details):
0 = good;
1 = suspicious;
2 = bad;
3 = non-existent.
Note (2): The listed uncertainties are based on population statistics and
derived as described in Section 5.1 and correspond to the half-width
of the 68%-confidence interval (i.e., these are 1σ error bars in
the case of gaussianity).
Note (3): 0 corresponds to North and 90 corresponds to East.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [2989/33818] Identifier
7- 13 F7.4 mag F160W [17.2/29.5] HST/WFC3 F160W band AB magnitude
15- 22 F8.4 pix r [0.3/326.5] Half-light semi-major axis
(1pix=0.06arcsec)
24- 29 F6.4 --- n [0.2/8.0] Sersic index
31- 36 F6.4 --- q [0/1] Projected axis ratio
38- 47 F10.6 deg PA [-90/90] Position angle (1)
49- 59 F11.6 --- S/N [0/2142] Signal-to-noise
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Note (1): 0 corresponds to North and 90 corresponds to East.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Dec-2012