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CFHTLS Reference center Total Total sky Filters Comment field RA DEC pointings coverage name [J2000] [J2000] [n×p] [deg 2 ] W1 02:18:00 −07:00:00 9×8 8.5×7.5 u ∗ , g, r, i/y, z 16 y W2 08:57:49 −03:19:00 5×5 4.8×4.7 u ∗ , g, r, i/y, z New center; 2y W3 14:17:54 +54:30:31 7×7 6.7×6.6 u ∗ , g, r, i/y, z 7 y W4 22:13:18 +01:19:00 25 23.3 u ∗ , g, r, i/y, z SE-NW elongated; 7 y Table 3: Overview of the CFHTLS Wide fields. The pointings “n×p” refer to the numbers of tiles along the horizontal and vertical axes of MegaCam (i.e. the E-W and N-S axes). Sky coverage is expressed along RA and DEC axes. Filter Median number Median exposure time Mean limiting magnitude Mean image quality of exposures [seconds] [MegaCam AB system] [ ′′ ] u ∗ 5 3000 25.2 0.85 g 5 2500 25.5 0.78 r 4 2000 25.0 0.71 i/y 7 4300 24.8 0.64 z 6 3600 23.9 0.68 Table 4: Mean properties of the CFHTLS Wide survey. The i and y are not split into two sub-samples. The Mean limiting magnitude corresponds to the 80% completeness limit for point-like sources. The Mean image quality is the mean FWHM of stellar sources over all stacks. 30
3 arc−min. 3 arc−min 57 arc−min. RA offset Ref Ref 4 arc−min. 56 arc−min. DEC offset N Pre−wide survey fields E 0.5 arc−min CFHTLS Wide pointing and dithering strategy 1 deg. Figure 21: Offsets between adjacent pointings (left) and dithering (right) inside a pointing of the CFHTLS Wide survey. Each pointing (or tile) overlaps along the RA and DEC directions with its nearest neighbors. In addition to the large offsets, the observations at each CFHT Wide reference position ("Ref" and green filled circles) are split into an observing sequence of exposures, with a small dither between each. The dithering pattern depends on the number of exposure per sequence and is different for each filter (see Table 4). In all configurations the dithered positions (black filled circles) are among those located inside a 30"×180" ellipse centered at the reference position of a Wide pointing. This is illustrated on the right hand of the figure (drawn from the CFHT dithering pattern plot: http://www.cfht.hawaii.edu/Instruments/Imaging/MegaPrime/specsinformation.html. The details of this figure are given at this URL). The offsets and the dithers along the DEC direction are sufficiently large to fill the central horizontal gap (83 ′′ high) between the CCDs (see Fig. 2) with a fraction of exposures of each sequence. The dash-dot-dot blue squares on the left show the positions of Pre-Wide images. They are shifted by a half-MegaCam field of view, in both directions, in order to provide very large overlaps between pointings and ease the astrometric calibration. The Pre-Wide images are short exposures (3 mn) only done in r-band. 31
Page 1: T0007 : The Final CFHTLS Release Pa
Page 4 and 5: patches are provided. Sources from
Page 6 and 7: Contents 1 CFHTLS-T0007 Executive S
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 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
Page 62 and 63: Wide Field Magnitude range u ∗ g
Page 64 and 65: paths. From the joint effort betwee
Page 66 and 67: Wide field External magnitude offse
Page 68 and 69: Wide field External rms errors with
Page 70 and 71: Figure 38: Comparison of one CFHTLS
Page 72 and 73: 4.5.2 Absolute astrometric accuracy
Page 74 and 75: 4.6 Outliers, stacks with exception
Page 76 and 77: Figure 40: Mean RA-DEC offsets betw
Page 78 and 79: Figure 42: Mean RA-DEC offsets betw
Page 80 and 81: W Cartesian CFHTLS Special filter V
Page 82 and 83: accurately reflect the integration
Page 84 and 85: Field Parameter u ∗ g r i y z D1-
Page 86 and 87: Field Parameter u ∗ g r i y z D1-
Page 88 and 89: 76 Figure 43: Comparison of the (u
Page 90 and 91: 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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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
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SCAMP photometric run (D1,D2,D3,D4)
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B.2.2 SWarp stack configuration fil
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B.2.3 SWarp chi2-image configuratio
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B.2.4 SExtractor .ldac catalogue co
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B.2.5 SExtractor DUAL MODE .cat cat
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Acronyms & Abbreviations ASCII CADC
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References Astier, P., et al. 2006,
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