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Figure 18: Matching between one L99 image an a CFHTLS Wide tile (stacks are represented by a simplified notation). Upper panel and inset: magnitude difference between W1 and L99; lower panels, magnitude errors and FLUX_RADIUS measurements for both stacks; right panel, histogram of differences. Grey and black dots represent all objects and those used for computation of statistics and rescaling factors respectively. Visual inspection of these control plots allows one to ensure that the sample for final statistics is drawn from non-saturated stars with unblended photometry in both catalogues, following the selection criteria outlined in the text. 24
filter u g r i.MP9701 (i) i.MP9702 (y) z m ab 10.211 9.592 9.343 9.253 9.256 9.241 m bd17 9.769 9.691 9.218 8.914 8.947 8.774 δ ab 0.442 -0.099 0.125 0.339 0.309 0.467 Table 2: Offsets between AB magnitudes and the SNLS Vega-based MegaCam calibration. It follows that the AB offsets required to bring SNLS magnitudes to AB system, δ ab = m ab − m |x0 , are : δ ab = −2.5 log 10 ∫ λT(λ)φbd17 (λ)dλ ∫ λT(λ)φab (λ)dλ − m bd17 (10) The pixels in the images are scaled following this relation: p AB = p VEGA × 10 0.4×δ AB (11) 3.8 Final catalogue production In the Wide and Deep surveys, a .ldac SExtractor source catalogue is produced immediately after the final rescaling of the stacks (using L99 images for the Wide and the SNLS standard star catalogue for the Deep). The T0007 Wide and Deep .ldac source catalogues have been produced using a 128 pixels mesh size to derive the local sky background (BACK_SIZE parameter in SExtractor). These catalogues are the inputs of the QFITS-out processing. The SExtractor configuration file for the production of the T0007 .ldac catalogues are presented in Appendix B.2.4 and Appendix A.3.4 for Wide and Deep respectively. After the production of the chi2 image, SExtractor is run in dual-image mode on the u ∗ g, r, i, y and z stacks using the chi2 image as reference. The Wide and Deep chi2 .cat catalogues are produced with a using a background mesh size in SExtractor of 256 pixels. All catalogues contain parameter values for all quantities listed in Tables 28, 29 and 30. For each source, aperture magnitudes are computed within 27 (26+SNLS) apertures, following same procedure as for the previous T0006 release. The SExtractor configuration file used for the production of the T0007 .cat dual-image mode catalogues is listed in the Appendix B.2.5 and Appendix A.3.5 for Deep and Wide surveys respectively. Based on its measured MAG_SNLS, each source is corrected for aperture, leading to the MAG_IQ20 magnitude. Additionally, for each survey pointing, the following data products are produced: • a (u, g, r , i/y, z) Wide or (u, g, r , i,y, z)-merged Deep catalogues that includes a restricted number of parameters. These catalogues are produced in two versions with either MAG_AUTO, MAG_SNLS and MAG_IQ20 magnitudes. They also contain the E(B − V) value at each source position derived from dust map images (Schlegel et al., 1998) and the dk cell number for the given position on the image, an estimate of a second order term of the photometric flatness of the image, meant to account for the slight variation in bandwidth of the MegaCam filters from center to edge. See Regnault et al. (2009) for a full explanation. Since it did not bring any significant gain, the dk term is not used within T0007. • a (u, g, r , i/y, z)-merged Wide, or (u, g, r, i, y, z)-merged Deep multi-aperture (.ape) extended catalogue that only includes the data concerning the 27 MAG_APER informations in all filters. 25
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 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
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-
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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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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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