Stellar Populations in a z=4 Lensed Galaxy with NICMOS

Details Stellar Populations in a z=4 Lensed Galaxy with NICMOS Stellar Populations in a z=4 Lensed Galaxy with NICMOS

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10887b&link_type=abstract

HST Proposal ID #10887. Cycle 15

Physics

Scientific paper

We propose to use NICMOS on HST to undertake deep high-resolution H-band imaging of a z=4 galaxy, lensed by a rich foreground cluster into highly-magnified arcs 3-5arcsec in length. By combining this with existing deep K-band imaging from Keck and high-quality archival WFPC2 and ACS data, we can spatially resolve stellar populations along the arcs. The WFPC2 images clearly reveal several bright knots, which may correspond to sites of active star formation. Indeed, our Keck/LRIS spectra Bunker, Moustakas & Davis 2000 are consistent with OB-star spectral energy distributions in the rest-ultraviolet. However, there are considerable portions of the arcs which appear redder with no Ly-alpha emission, consistent with being post-starburst regions. The sensitivity and resolution afforded by NIC2 is crucial to study the inter-knot flux in H-band F160W, a goal unachievable from the ground. In conjunction with our deep Keck K' data, NIC2 imaging will straddle the 4000Ang+Balmer break and thus allow us to `age-date' the stellar populations by the inferred amplitude of the break along the transverse extent of the arcs. We can achieve this in 8 orbits, and address whether this star-forming galaxy at z=4 has had extended formation histories - vital for the interpretation of the Lyman Break Galaxies, and their relation to the evolved Extremely Red Objects.

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