COSMOS Observations: Infrared, Optical, and Ultraviolet

In additon to the major COSMOS S-Cam optical observing program underway at the Subaru Telescope, IR/Optical/UV large imaging surveys of the entire COSMOS field are ongoing at several telescopes in both hemispheres.

• CFHT-MegaCam UV/Optical imaging surveys (broad band filters)
  • 30 hours with the wide-field imager MegaCam on the 3.4m CFHT telescope covering the entire COSMOS field with the u*-band filter (0.36 microns). An additonal ~5 hours of i-band (0.9 microns) imaging data were obtained in Fall '03 in order to facilitate in the initial selection of a spectroscopic sample of the brighter sources in the COSMOS field.
  • Sensitivity: (AB, 5 sigma): u* (27.4), i (24.9)
  • Data products:
    1. Photometric, flux calibrated u* images are being produced at IAP/Terapix. The first ~20Hrs of data have now been obtained/reduced and combined with the Subaru S-Cam images of the entire field.
  • Teams: D. Sanders (PI) + 10 others; O. Lefevre (PI) + others
• Near-Infrared imaging surveys
  • Three surveys covering 1.0-2.2 microns
    1. 10 nights (Spring'04) and 9 nights (Spring'05) for K_s-band (2.2 microns) imaging with the NOAO wide-field IR imagers Flamingos (Kitt Peak) and ISPI (CTIO). The Spring'04 K_s data have been reduced and combined with the Subaru S-Cam and CFHT-MegaCam optical and UV data respectively to produce the first generation Photo-z catalog for the entire COSMOS field.
       • Team: B. Mobasher (PI) + 14 others
    2. 10 nights (Spring'04) + 9 nights (Spring'05) for J-band imaging with the IfA wide-field imager ULBCam on the UH 2.2m Telescope on Mauna Kea.
       • Team: D. Sanders (PI) + 10 others
    3. 10x0.5 nights (Spring'05) for Y-band (1.0 microns) and H-band (1.6 microns) imaging with the new wide-field infrared camera WFCAM on the UKIRT 3.8m Telescope on Mauna Kea.
       • Team D. Sanders (PI) + 14 others
  • Goals:
    • to use the near-infrared (Y,J,H,K) filters to improve the photometric redshifts for all galaxies
    • to detect heavily obscured sources, EROs, luminous infrared galaxies, and high-z sources