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ULTRADEEP INFRARED ARRAY CAMERA OBSERVATIONS OF SUB-L*z∼ 7 ANDz∼ 8 GALAXIES IN THE HUBBLE ULTRA DEEP FIELD: THE CONTRIBUTION OF LOW-LUMINOSITY GALAXIES TO THE STELLAR MASS DENSITY AND REIONIZATION
2009
Astrophysical Journal Letters
We study the Spitzer Infrared Array Camera (IRAC) mid-infrared (rest-frame optical) fluxes of 14 newly WFC3/IR-detected z=7 z_850-dropout galaxies and 5 z=8 Y_105-dropout galaxies. The WFC3/IR depth and spatial resolution allow accurate removal of contaminating foreground light, enabling reliable flux measurements at 3.6 micron and 4.5 micron. None of the galaxies are detected to [3.6]=26.9 (AB, 2 sigma), but a stacking analysis reveals a robust detection for the z_850-dropouts and an upper
doi:10.1088/2041-8205/708/1/l26
fatcat:7xveq72jwzarhaalnzyz2uetcm