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The Panchromatic Hubble Ultra Deep Field: Ultraviolet Coverage





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Principal Investigator: Dr. Harry Teplitz

The Hubble UltraDeep Field (UDF) has deep observations at Far-UV, optical (B-z), and NIR wavelengths, but only comparatively shallow near-UV (u-band) imaging from WFPC2. We propose to fill this gap in UDF coverage with deep near-ultraviolet imaging with WFC3-UVIS in F225W, F275W, and F336W. We take advantage of the unique capabilities of HST to reach point source detection limits of AB=29, a factor of ten fainter than the GALEX ultradeep surveys. In the spirit of the UDF, we submit this proposal in the Treasury category. We will increase the legacy value of the UDF by providing science quality images, photometric catalogs, and improved photometric redshifts to enable a wide range of research by the community.The scientific emphasis of this proposal is to investigate the episode of peak star formation activity in galaxies at 1 < z < 2.5. The UV data will enable identification of galaxies in this epoch via the Lyman break and will allow us to trace the rest-frame FUV luminosity function and the internal color structure of galaxies. We will measure the star formation properties of moderate redshift starburst galaxies including the UV slope. The high spatial resolution of UVIS (a physical scale of about 700 pc at 0.5 < z < 1.5) will enable an investigation of the evolution of massive galaxies by resolving sub-galactic units (clumps). We will measure (or set strict limits on) the escape fraction of ionizing radiation from galaxies at z~2-3 to better understand how star-forming galaxies reionized the Universe.

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