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Contents 1 CFHTLS-T0007 Executive Summary ii 2 Key new features in T0007 iii 3 T0007 processing description 1 3.1 A note on CCD numbering and nomenclature . . . . . . . . . . . . . . . . . . . . . . . 1 3.2 Detrending at CFHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3.3 Overview of T0007 processing at Terapix . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.4 Image evaluation and pre-selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.5 Astrometric calibration and initial photometric rescaling . . . . . . . . . . . . . . . . . 6 3.6 Production of the Wide and Deep stacks . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.7 Photometric calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.7.2 Choice of magnitude measurement method for calibration . . . . . . . . . . . . 13 3.7.3 Derivation of the MAG_IQ20 magnitudes . . . . . . . . . . . . . . . . . . . . . . 15 3.7.4 Quantifying the improvements using MAG_IQ20 compared to MAG_SNLS . . . . . 17 3.7.5 SNLS standard star catalogue . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.7.6 Calibrating the Deep survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.7.7 Photometric calibration of the Wide survey . . . . . . . . . . . . . . . . . . . . 22 3.7.8 Vega-AB conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.8 Final catalogue production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.9 Post-processing and quality control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4 Description of the CFHTLS T0007 Wide survey 27 4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.2 Seeing and image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.3 Depth and completeness limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 4.4 Photometric accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.4.1 Internal photometric errors of Wide stacks from simulations . . . . . . . . . . . 44 4.4.2 Error estimation from overlapping Wide tiles . . . . . . . . . . . . . . . . . . . 48 4.4.3 Comparing CFHTLS-T0007 with SDSS-DR8 . . . . . . . . . . . . . . . . . . 50 4.4.4 External photometric errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4.4.5 CFHTLS Wide photometric precision . . . . . . . . . . . . . . . . . . . . . . . 56 4.4.6 Stellar color-color plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 v
4.4.7 Color offsets between CFHTLS and SDSS . . . . . . . . . . . . . . . . . . . . 57 4.5 Astrometric accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 4.5.1 Astrometric calibration errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 4.5.2 Absolute astrometric accuracy of the CFHTLS stacks . . . . . . . . . . . . . . 60 4.6 Outliers, stacks with exceptions or anomalies . . . . . . . . . . . . . . . . . . . . . . . 62 5 Description of the CFHTLS T0007 Deep survey 69 5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 5.2 Astrometric accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 5.3 Photometric accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 5.3.1 Comparison with SDSS-DR8 . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 5.3.2 Internal photometric errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 5.4 Depth and completeness limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 6 Data products 85 6.1 Data set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 6.2 Data types and file naming conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 87 6.3 Content of CFHTLS source catalogues . . . . . . . . . . . . . . . . . . . . . . . . . . 92 6.4 The QualityFITS input and output products . . . . . . . . . . . . . . . . . . . . . . . . 98 6.5 Transfer to CADC and CDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 6.5.1 Data products at CADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 6.5.2 Data products at CDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 7 Acknowledgements 105 A CFHTLS T0007 Wide supplementary information 106 A.1 Complete list of Wide stacks coordinates, filters and exposure time . . . . . . . . . . . 106 A.2 List of images in each Wide stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 A.3 CFHTLS T0007 Wide configuration files . . . . . . . . . . . . . . . . . . . . . . . . . 125 A.3.1 SCAMP configuration files for T0007 Wide . . . . . . . . . . . . . . . . . . . . 125 A.3.2 SWarp stack configuration file for T0007 Wide . . . . . . . . . . . . . . . . . . 133 A.3.3 SWarp chi2-image configuration file for T0007 Wide . . . . . . . . . . . . . . . 135 A.3.4 SExtractor .ldac catalogue configuration file for T0007 Wide . . . . . . . . . 137 A.3.5 SExtractor DUAL MODE .cat catalogue configuration file for T0007 Wide . . . . 139 B CFHTLS T0007 Deep supplementary information 141 vi
Page 1: T0007 : The Final CFHTLS Release Pa
Page 4 and 5: patches are provided. Sources from
Page 8 and 9: B.1 Rescaling factors applied to de
Page 10 and 11: 33 Galaxy counts for the four Wide
Page 12 and 13: 30 Description of parameters listed
Page 14 and 15: B A B A B A B A B A B A B A B A B A
Page 16 and 17: constraints. Two series of Deep sta
Page 18 and 19: evealed minor problems (such as unu
Page 20 and 21: een preferable because of the highe
Page 22 and 23: Figure 5: Outputs of the SCAMP cali
Page 24 and 25: Figure 7: CFHTLS T0007 absolute pho
Page 26 and 27: Figure 8: Seeing FWHM distribution
Page 28 and 29: Figure 10: Aperture correction (def
Page 30 and 31: Filter u g r i z - ApCorr - ApCorr
Page 32 and 33: Figure 14: Photometric calibration
Page 34 and 35: Figure 17: Photometric calibration
Page 36 and 37: Figure 18: Matching between one L99
Page 38 and 39: • four (u, g, r , i/y, z) Wide pa
Page 40 and 41: W1 W2 N N E E W3 W4 N N E E Figure
Page 42 and 43: CFHTLS Reference center Total Total
Page 44 and 45: Each tile is centered at a well-def
Page 46 and 47: Field Parameter u ∗ g r i y z W1
Page 48 and 49: Figure 23: Distribution of exposure
Page 50 and 51: Figure 25: Distribution of the medi
Page 52 and 53: All CFHTLS Wide images: (mean CCD s
Page 54 and 55: 50% completeness are given for poin
Page 56 and 57:
80% completeness limit (stars) 26.0
Page 58 and 59:
10 5 W1 W2 W3 10 5 W1 W2 W3 N gal 0
Page 60 and 61:
Wide Field Magnitude range u ∗ g
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Wide Field Magnitude range u ∗ g
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paths. From the joint effort betwee
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Wide field External magnitude offse
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Wide field External rms errors with
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Figure 38: Comparison of one CFHTLS
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4.5.2 Absolute astrometric accuracy
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4.6 Outliers, stacks with exception
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Figure 40: Mean RA-DEC offsets betw
Page 78 and 79:
Figure 42: Mean RA-DEC offsets betw
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W Cartesian CFHTLS Special filter V
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accurately reflect the integration
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Field Parameter u ∗ g r i y z D1-
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Field Parameter u ∗ g r i y z D1-
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76 Figure 43: Comparison of the (u
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Figure 44: Estimation of the intern
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5.4 Depth and completeness limits T
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D2 u−band (25% best−seeing imag
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log Ngal 0.5 mag −1 deg −2 5 4
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- there is one chi2 image per Wide
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File name Content Data Size Number
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File name Content Data Size Number
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6.3 Content of CFHTLS source catalo
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stacks made with the y-(i.MP9702) f
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Id Parameter Description Units Comm
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6.4 The QualityFITS input and outpu
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Figure 48: QFITS-out page of the W4
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102
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Figure 51: Upper panel: CFHTLS all-
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A CFHTLS T0007 Wide supplementary i
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Table 31 - Continued from previous
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A.2 List of images in each Wide sta
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Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
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DISTORT_GROUPS 1,1 # Polynom group
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#--------------------------- Photom
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#--------------------------- Photom
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#--------------------------- Photom
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#--------------------------- Backgr
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#--------------------------- Backgr
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#------------------------- Star/Gal
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#--------------------------- Star/G
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B.2 CFHTLS T0007 Deep configuration
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SCAMP astrometric run using interna
Page 158 and 159:
SCAMP photometric run (D1,D2,D3,D4)
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B.2.2 SWarp stack configuration fil
Page 162 and 163:
B.2.3 SWarp chi2-image configuratio
Page 164 and 165:
B.2.4 SExtractor .ldac catalogue co
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B.2.5 SExtractor DUAL MODE .cat cat
Page 168 and 169:
Acronyms & Abbreviations ASCII CADC
Page 170 and 171:
References Astier, P., et al. 2006,
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