COSMOS2020 Catalog
The new COSMOS2020 catalog can be downloaded here. The catalog contains 1 million sources measured in more than 30 photometric bands from the UV to the infrared. For the extraction of the photometry, our international team applied a new prior-based method to go even deeper and to obtain more robust measurements for blended sources. The catalog also contains photometric redshifts and other physical properties of the galaxies measured from their photometry using spectral energy distribution (SED) fitting codes like LePhare and Eazy. This catalog is a major milestone for COSMOS, combining its multi-wavelength data consistently, and opening up new avenues to explore galaxy evolution.
COSMOS2015 Catalog
(Laigle et al. 2016)
Available here. The COSMOS2015 catalogue contains precise PSF-matched photometry, photometric redshifts and stellar masses for more than half a million of sources (excluding masked area) on the COSMOS field. Including all the already existing optical bands, new YJHKs images from the UltraVISTA-DR2 survey, Y -band from Hyper Suprime-Cam and infrared data from SPLASH Spitzer legacy program, this near-infrared selected catalog is highly optimised for the study of galaxy evolution and environments in the early Universe. To maximise catalog completeness for bluer objects and at higher redshifts, objects have been detected on an ultra-deep chi-squared sum of the YJHKs and z++ images by running SExtractor in dual mode (Bertin & Arnouts 1996). The catalog contains ∼ 6 × 105 objects in the 1.5 deg2 UltraVISTA-DR2 area and ∼ 1.5×105 in the “ultra-deep stripes” (0.62 deg2) at Ks ≤ 24.7 (3σ,3′′). The deepest regions reach a 90% completeness limit of 1010M⊙ to z = 4. Detailed comparisons of the colour distributions, number counts and clustering show excellent agreement with the literature in the mass ranges where these studies overlap with ours. The COSMOS2015 catalogue represents an invaluable public resource to investigate the evolution of galaxies within their environment back to the earliest stages of the history of the Universe. This catalogue can be downloaded via anonymous FTP and is fully described in Laigle et al. (2016).
The i-band selected catalogue v2.1
(Capak et al. 2007, Ilbert et al. 2009)
Available here. This catalogue contains 2 million sources selected in i+ band. The method to create the i-band selected catalogue is described in Capak et al. (2007). Since 2007, this catalogue has continuously been improved by adding new datasets. We are currently releasing version v2.1 of this catalogue including the medium-band data from Subaru, the UltraVISTA data, the SPLASH data which did not existing in 2007. Still, the method to generate the multi-color catalogue remains the same. Photometry was done using SExtractor in dual mode (Bertin & Arnouts 1996). Source detection was run on the deepest image (i+ ~26.2 for a point source detected at 5σ). In order to obtain accurate colors, all the images were degraded to the same PSF of 1.5”. The final photometric catalogue contains PSF matched photometry for all the bands from the u∗ to the K band, measured over an aperture of 3” diameter at the position of the i+ band detection. For the FUV and NUV GALEX data, the catalogue is provided in total flux obtained by a PSF fitting procedure (Zamojski et al. 2007). The IRAC fluxes were measured in a circular aperture of radius 1.9” and converted to a total flux using aperture corrections.
The NIR-selected catalogue
(McCracken et al. 2012, Ilbert et al. 2013)
Available here. A NIR-selected catalogue has been produced by McCracken et al. (2012). In this catalogue, the detection image is the chi-squared sum of the (non-convolved) UltraVISTA DR1 YJHKs images, following the techniques outlined in Szalay et al. (1999). The method to generate this catalogue is almost the same as Capak et al. (2007). The main difference is that the images were degraded to the same PSF of 1.1”, rather than 1.5” (because we decided to drop the g band from our analysis).
Contact
If you require further information on the above photometric catalogues, please contact Clotilde Laigle - laigle [at] iap.fr ; Olivier Ilbert - olivier.ilbert [at] lam.fr ; Henry McCracken - h.j.mccracken [at] gmail.com ; Peter Capak - capak [at] astro.caltech.edu
The COSMOS Super-deblend catalogue
Internally available here for team members, this catalogue will be released publicly upon acceptance of the paper Jin, Daddi, et al 2017 (in prep.). This catalog is produced via a Super-deblended code, following the same method we adopted for the Super-deblended catalogue in the GOODS-North field (Liu, Daddi et al. 2017). We have been using PSF fitting at the position of a highly complete set of priors selected in the radio (in collaboration with Smolcic/Schinnerer and the VLA 3GHz team), Spitzer 24um and in stellar mass. We perform ‘active’ removal of non relevant priors at each band using SED fitting and redshift information, subtracting the flux of hopelessly faint priors from the maps and PSF fitting the rest with galfit. Our photometry has well-behaved Gaussian-like uncertainties calibrated from MonteCarlo simulations and tailored to observables (crowding, residual maps). In this catalogue, including photometry from Spitzer, Herschel, SCUBA, AzTEC, MAMBO and VLA (3GHz and 1.4GHz), there are 88K galaxies with significant 24um and/or radio detections and ~11K galaxies with Herschel and/or SCUBA2 detection and highly reliable photometry.
Contact: Shouwen Jin - shuowen.jin [at] gmail.com ; Emanuele Daddi - emanuele.daddi [at] cea.fr
