############################################################# # Release of the COSMOS photometric redshifts # Version 1.5, April, 05 2008 - Magnitude-limited (I<25) Please, contact ilbert@ifa.hawaii.edu,capak@ipac.caltech.edu,ms@astro.caltech.edu for any questions related to this catalogue. Please refer to Ilbert, Capak, Salvato et al., ApJ, 2008, astro-ph/0809.2101 ######################################### # PEOPLE Photometric catalogue from P. Capak Photo-z catalogue from O. Ilbert PIs of the photometric data: D.B. Sanders, N. Scoville, Y. Tanigushi Data reducers: H. Aussel, P. Capak, H. McCracken, M. Salvato, S. Sasaki,D. Thompson, O. Ilbert, J. Kartaltepe, E. Le Floc'h, D. Looper, D.B. Sanders, N. Scoville Spectroscopic redshifts for validation from the zCOSMOS team (PI S. Lilly), from J. Kartaltepe and from P. Capak Identification of the Xray sources in the optical catalogue M. Brusa, G. Hasinger and the COSMOS/XMM team. ######################################### # SELECTION OF THE CATALOGUE Selection of the catalogue 1) I(auto)<25 2) deep subaru area !!!!! WARNING !!!!!!!!! See Fig.9 and Fig.2 of Ilbert, Capak, Salvato et al. (2008) for the photo-z accuracy as a function of magnitude and redshift Total number of objects 385065 ######################### # UPDATES IN THE PHOTOMETRIC CATALOG VERSUS 2006 The detection image, I band mask, and SExtractor settings were significantly modified between the Jan 2006 and this release. All point sources brighter than 17th mag were modeled and subtracted from the detection image. This allowed the de-blending contrast to be set at a higher value, thus significantly decreasing the number of spurious sources without missing objects around bright sources or blending a significant number of close pairs. The combination of the change in background, de-blending, and detection results in small changes in the centroid and flux for some sources. However, this also implies that few AGN, close by galaxies and bright stars are removed from the catalog. A list of these missing objects is provided. The I band mask has been modified to reflect the subtracted objects and changes in the number of spurious sources. In addition to lowering the contrast parameter, several of the detection parameters were adjusted to decrease the number of noise peaks at the faint end of the catalog. ######################################### # UPDATES IN THE PHOTO-Z CATALOGUE VERSUS 2006 See Ilbert, Capak, Salvato et al. (2008) 1) New photometry with 30 bands 2) Photo-z computed with Le_Phare (Arnouts & Ilbert) ############################################ ## HEADER ############################################ ######################### Object identification from the Peter Capak's catalogue (version Nov, 2007) 1 Id 2 tile 3 alpha J2000, in deg 4 delta J2000, in deg ######################### Best photo-z 5 zp_best z= zgal if galaxy (column 7) z= 0 if star z= 9.99 if Xray (Use the photo-z values from Salvato et al. 2008, released separately) z= null if in a masked area 6 type type=0 if galaxy type=1 if star type=2 if Xray source type=null if masked area ######################### Best fit obtained with the galaxy templates warning: every source has a redshift, regardless of the type or if it is in a masked area or not 7 zp_gal photo-z measured using the galaxy templates 8 zl68_gal lower limit, 68% confidence level 9 zu68_gal upper limit, 68% confidence level 10 zl99_gal lower limit, 99% confidence level 11 zu99_gal upper limit, 99% confidence level 12 chi_gal reduced chi2 (null if less than 3 filters) 13 mod_gal best fit template (1->8 Ell-S0, 9->15 Sa-Sc, 16->19 Sd-Sdm from Polletta et al., >=20 from BC03). 14 ebv additional extinction E(B-V) (Prevot et al. for templates <=24, Calzetti et al for template>24) 15 zp_sec second photo-z solution if a second peak is detected in the PDFz (null if not detected) 16 chi_sec reduced chi2 for the second photo-z solution (use only if zp_sec>0) 17 mod_sec template for the second photo-z solution (use only if zp_sec>0) 18 ebv_sec additional extinction for the second photo-z solution (use only if zp_sec>0) ######################### Best fit obtained with the star templates 19 mod_star model for the star library 20 chi_star reduced chi2 ######################### Observed magnitudes The corrections for the galactic extinction using the Schlegel map values are included The offsets computed to have better photo-z are not included. No aperture correction or auto-offset were applied. 21 Umag CFHT u* aperture magnitude (3" aperture) 22 Bmag Subaru B aperture magnitude (3" aperture) 23 Vmag Subaru V aperture magnitude (3" aperture) 24 Gmag Subaru g+ aperture magnitude (3" aperture) 25 Rmag Subaru r+ aperture magnitude (3" aperture) 26 Imag Subaru i+ aperture magnitude (3" aperture) 27 Zmag Subaru z+ aperture magnitude (3" aperture) 28 ICmag CFHT i' aperture magnitude (3" aperture) 29 Jmag UKIRT J aperture magnitude (3" aperture) 30 Kmag CFHT K aperture magnitude (3" aperture) ######################### Errors on observed magnitudes Minimum error at 0.01 mag 31 eU 32 eB 33 eV 34 eG 35 eR 36 eI 37 eZ 38 eIC 39 eJ 40 eK ######################### PHOTOMETRIC FLAG !! We advice to not use galaxies masked in any of the optical bands !! !! All flags should be set at 0 !! 41 flagB mask in the B band, 0 good 42 flagV mask in the V band, 0 good 43 flagi mask in the I band, 0 good 44 flagz mask in the Z band, 0 good 45 flagD mask for the deep area, 0 good ######################### Additional information 46 NbFilt Number of filters used in the photo-z fitting. 47 I_auto Auto magnitude in the i band 48 auto_offset Offset to transform aperture magnitude into auto 49 auto_flag Quality flag in the offset 50 MV absolute magnitude in the V(Subaru) band (valid only for galaxies)