A Lyman Break Galaxy Candidate at z~9 - AstrophysicsReport as inadecuate

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Abstract: We report the discovery of a z~9 Lyman Break Galaxy LBG candidate, selectedfrom the NICMOS Parallel Imaging Survey as a J-dropout with J110 - H160 = 1.7.Spitzer-IRAC photometry reveals that the galaxy has a blue H160 - 3.6 um color,and a spectral break between 3.6 and 4.5 um. We interpret this break as theBalmer break, and derive a best-fit photometric redshift of z~9. We use MonteCarlo simulations to test the significance of this photometric redshift, andshow a 96% probability of z>7. We estimate a lower limit to the comoving numberdensity of such galaxies at z~9 of phi > 3.8 x 10^{-6} Mpc^{-3}. If the highredshift of this galaxy is confirmed, this will indicate that the luminous endof the rest-frame UV luminosity function has not evolved substantially from z~9 to z~3. Still, some small degeneracy remains between this z~9 model andmodels at z~2-3; deep optical imaging reaching I ~ 29 AB can rule out thelower-z models.

Author: Alaina L. Henry, Matthew A. Malkan, James W. Colbert, Brian Siana, Harry I. Teplitz, Patrick McCarthy

Source: https://arxiv.org/


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