The nature of JD0910+46: a candidate z~10 galaxy

Details The nature of JD0910+46: a candidate z~10 galaxy The nature of JD0910+46: a candidate z~10 galaxy

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..293t&link_type=abstract

Spitzer Proposal ID #293

Physics

Scientific paper

The earliest galaxies in the Universe should have formed at very high redshifts, z>10, 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 bright, spatially extended J-band dropout, JD0910+46, that is an promising candidate for a z>10 galaxy. Its spectral energy distribution is more extreme than any previously reported: It is undetected in J, with a very red J-H color, yet is quite blue in H-K. It appears to be the best candidate to date for a z>10 galaxy: These colors are natural for a Lyman break, but model SEDs of either "old" or dusty galaxies at more moderate redshifts (z~3) cannot easily reproduce the observed combination of red J-H and blue H-K color. Yet we do not feel the case for z>10 can be adequately resolved with existing optical and NIR data alone. Spitzer/IRAC photometry will convincingly distinguish between different models and so elucidate the nature of this remarkable source. Should it turn out to be at a lower redshift it will provide an important example of the kinds of interloper which may contaminate samples of high-z candidates based on the dropout technique.

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