Pinning down the redshift of the J-band dropout JD0910+46

Details Pinning down the redshift of the J-band dropout JD0910+46 Pinning down the redshift of the J-band dropout JD0910+46

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11098l&link_type=abstract

HST Proposal ID #11098. Cycle 15

Physics

Scientific paper

The earliest galaxies in the Universe should have formed at very high redshifts, based both on models of hierarchical structure formation, and on observations of the microwave background polarization by WMAP that require significant ionization of the intergalactic medium before z=10. However, direct observation of sources at z>7 remains highly challenging due to their scarcity and faintness. We recently identified a spatially extended J-band dropout, JD0910+46, that is a promising candidate for a z>10 galaxy. Its spectral energy distribution is more extreme than any previously reported: It is undetected in our 2-orbit J-band observation, with a very red J-H color, yet is bluer in H-K than plausible lower redshift z~3 model SEDs. These colors are, however, natural for a very high redshift star-burst galaxy in which the Lyman-alpha break has moved mostly or entirely through the F110W band. Here we propose deeper F110W and F187W observations to better map the spectral energy distribution of JD910+46, these have the potential to convincingly reject all low redshift solutions for the origin of the observed colours. We believe the importance of such a discovery adds urgency to the followup, and motivates this DD request. Even in the event that JD0910+46 lies at lower redshift understanding the nature of the object will be of great importance since it may lie in a significant overdensity of galaxies at z~4, and will be an important tool for identifying possible interlopers in samples of ultra high-z galaxies.;

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