***************************************************** ****CFHTLS-T03 photometric redshifts version 1.0***** ***************************************************** ========================================================================== ============ THE ASSOCIATED PAPER ========================================================================== Title: Accurate photometric redshifts from the CFHT Legacy Survey calibrated on the VIMOS VLT Deep Survey Ilbert et al. Reference: A&A, submitted, astro-ph/ ========================================================================== ============ DESCRIPTION ========================================================================== We release to the French and Canadian communities the photometric redshifts computed from the CFHT Legacy Survey (http://www.cfht.hawaii.edu/Science/CFHTLS) for the four deep fields: CFHTLS-D1, 02h 25m 59s -04o 29' 40'' CFHTLS-D2, 10h 00m 28s +02o 12' 30'' CFHTLS-D3, 14h 19m 27s +52o 40' 56'' CFHTLS-D4, 22h 15m 31s -17o 43' 56'' We used the TERAPIX-CFHTLS-T03 release candidate photometric catalogues (http://terapix.iap.fr/rubrique.php?id_rubrique=208) to compute these photometric redshifts. For all fields, CFHTLS-MEGACAM u*g'r'i'z' magnitudes are used. For the CFHTLS-D1 field, we also additional BVRI apparent magnitudes from the shallower VVDS-F02 photometric survey (McCracken et al. 2003) which covers the entire field of view. NIR data is also available for a subarea of 160 arcmin2 (Iovino et al. 2005). These photometric redshifts have been calibrated using 3241 spectroscopic redshifts from the VIMOS VLT Deep Survey (http://www.oamp.fr/) between 0 54 in column 9) have to be treated with caution: in this case, the photometric redshifts are less reliable (see Fig.8 and Section 5.2 in the paper) and narrow peaks are present in the redshift distribution of the starburst galaxies (section 4.2 of the associated paper). 3) The reliability of the photometric redshifts is worse for fainter objects (quantified in Fig.7 and 15). We advise that photometric redshifts should not be used for objects fainter than i'<25. ========================================================================== ============ FILES ========================================================================== paper_zphot_release1.0.pdf => the associated paper describing method and photometric redshift quality zphot_release1.0_CFHTLST03_D1.out => photometric redshifts of the CFHTLS-D1 field. zphot_release1.0_CFHTLST03_D2.out => .............................CFHTLS-D2....... zphot_release1.0_CFHTLST03_D3.out => .............................CFHTLS-D3....... zphot_release1.0_CFHTLST03_D4.out => .............................CFHTLS-D4....... PDFz_release1.0_CFHTLST03_D1.out => PDFz of the photometric redshifts of the CFHTLS-D1 field. PDFz_release1.0_CFHTLST03_D2.out => .........................................CFHTLS-D2....... PDFz_release1.0_CFHTLST03_D3.out => .........................................CFHTLS-D3....... PDFz_release1.0_CFHTLST03_D4.out => .........................................CFHTLS-D4....... ========================================================================== ============ CATALOGUES HEADER FOR zphot_release1.0_CFHTLSD*.out ========================================================================== INFORMATION ON THE GALAXY 1 Id release T03 2 alpha 3 delta PHOTOMETRIC REDSHIFT FOR THE GALAXY LIBRARY (see note a) 4 photometric redshift (zp) 5 lower zp value for 1 sigma error bar 6 upper zp value for 1 sigma error bar 7 lower zp value for 3 sigma error bar 8 upper zp value for 3 sigma error bar 9 best fit template (1-16 CWW Ell, 17-29 CWW Sbc, 30-43 CWW Scd, 44-54 CWW Irr, 55-62 Kinnney SB) 10 extinction E(B-V) 11 second solution in zp if there is a second peak detected with P>5% in the PDFz NATURE OF THE OBJECT (see note b) 12 estimated nature of the object (0:galaxy. 1:star, 2:QSO) 13 best chi2 for the galaxy library 14 best chi2 for the star library 15 best chi2 for the QSO library 16 photometric redshift corresponding to the QSO solution. DATA QUALITY 17 photometric flag (0:galaxy ; 1:star ; !!!WARNING IF >1 THE OBJECT IS ON A MASKED AREA AND SHOULD NOT BE USED!!!!!). 18 Number of bands used for the computation. Less than 3 is problematic. 19 Context is an integer which indicates the exact bands used in the zp computation. Context= sum of 2^n where n=0,1,2,3,4,5,6,7,8,9,10,11,12 for the B,V,R,I,u*,g',r',i',z',J,K filters respectively. ABSOLUTE MAGNITUDES (see note c) 20 absolute magnitude in u* (CFHTLS filters) 21 absolute magnitude in g' (CFHTLS filters) 22 absolute magnitude in r' (CFHTLS filters) 23 absolute magnitude in i' (CFHTLS filters) 24 absolute magnitude in z' (CFHTLS filters) 25 absolute magnitude in U (Johnson-Kron-Cousin filters) 26 absolute magnitude in B (Johnson-Kron-Cousin filters) 27 absolute magnitude in V (Johnson-Kron-Cousin filters) 28 absolute magnitude in R (Johnson-Kron-Cousin filters) 29 absolute magnitude in I (Johnson-Kron-Cousin filters) GALAXY SPECTRAL TYPE (see note c) 30 best fit CWW template 1: Ell CWW ; 2: Sbc ; 3: Im ; 4: Im+SB. We use the optimized 4 CWW templates (Fig.5) without additionnal extinction. ### WARNING ### This release is intended only for VVDS consortium members. It ### should not be distributed outside the consortium! ### The match with the spectroscopic redshifts has to be redone by #### Vincent Le Brun and does not correspond to the 'official' version # #APPARENT MAGNITUDES note d) # 31 VVDS spectroscopic redshift # 32 VVDS spectroscopic flag # 33 u* # 34 err u* # 35 g' # 36 err g' # 37 r' # 38 err r' # 39 i' # 40 err i' # 41 z' # 42 err z' # 43 B # 44 err B # 45 V # 46 err V # 47 R # 48 err R # 49 I # 50 err I # 51 J # 52 eJ # 53 K # 54 eK note a) : zp will have a value of -999 if the photometric redshift can not be computed (too few bands, etc ...) note b) : the values given for the QSO are only informative since they have not been spectroscopically validated. note c) : absolute magnitudes and types are always computed (if 0<=z<6), even if the object is thought to be a star a QSO or within a masked regions. note d) : negative error in 1 band significates not detected or not observed. Be careful, on the D1, some object are observed in the VVDS and not in the CFHTLS. They have a lower zphot quality. You can remove them with ei>0. ========================================================================== ============ CATALOGUES HEADER FOR PDFz_release1.0_CFHTLSD*.out ========================================================================== These catalogues contain the Probability Distribution Function of the photometric redshift estimate (PDFz) corresponding to the galaxies in the catalogues zphot_release1.0_CFHTLSD*.out The PDFz is computed at the following redshifts: 0.00 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40 0.44 0.48 0.52 0.56 0.60 0.64 0.68 0.72 0.76 0.80 0.84 0.88 0.92 0.96 1.00 1.04 1.08 1.12 1.16 1.20 1.24 1.28 1.32 1.36 1.40 1.44 1.48 1.52 1.56 1.60 1.64 1.68 1.72 1.76 1.80 1.84 1.88 1.92 1.96 2.00 2.04 2.08 2.12 2.16 2.20 2.24 2.28 2.32 2.36 2.40 2.44 2.48 2.52 2.56 2.60 2.64 2.68 2.72 2.76 2.80 2.84 2.88 2.92 2.96 3.00 3.04 3.08 3.12 3.16 3.20 3.24 3.28 3.32 3.36 3.40 3.44 3.48 3.52 3.56 3.60 3.64 3.68 3.72 3.76 3.80 3.84 3.88 3.92 3.96 4.00 4.04 4.08 4.12 4.16 4.20 4.24 4.28 4.32 4.36 4.40 4.44 4.48 4.52 4.56 4.60 4.640 4.68 4.72 4.76 4.80 4.84 4.88 4.92 4.96 5.00 5.04 5.08 5.12 5.16 5.20 5.24 5.28 5.32 5.36 5.40 5.44 5.48 5.52 5.56 5.60 5.64 5.68 5.72 5.76 5.80 5.84 5.88 5.92 5.96 6.000 The format is the following: Id PDFz(0) PDFz(0.04) ............. PDFz(6.0)