Measuring the Stellar Masses of Galaxies at z~7

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Scientific paper

The two UDF NICMOS parallels contain the deepest optical / near-IR images available at any point on the sky and provide us with a unique opportunity to study the high redshift universe. Over the second of these parallels, we find several strong z-dropout (z~7 galaxy) candidates, adding to the ~2-3 other secure candidates we have found from systematic searches through the HST archive. We propose to significantly increase the depth of the IRAC data available over this field and thus measure stellar masses for these z-dropout candidates. This may provide us with our best opportunity to model the stellar populations of objects at z~7, and therefore constrain star formation at z>7. In addition, by obtaining deep IRAC data over the ultradeep ACS+NICMOS imaging data already available, we would have a field second only to the HUDF in its value for studies of galaxies at z>5. This would allow for two other significant endeavors: (1) to set significant constraints of the redshift of three J-dropout (z~8-11) candidates found in this field and (2) to do stellar population modelling on z~5-6 galaxies faintward of what has even been possible in the HUDF.

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