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Star-forming galaxies are an important population
for understanding galaxy evolution, and seeking these galaxies at
low and high redshifts is a crucial step that aids in studying
baryonic structure evolution and the interstellar medium. I will
discuss my past and on-going work using (1) narrow-band filters to
identify galaxies from to z ~ 0.07 to z ~ 2.2, (2) UV imaging to
identify z ~ 2 Lyman break galaxies, and (3) a census of z = 1-3
star-forming galaxies utilizing both near-infrared and UV
techniques.
This talk will describe my past work in the Subaru Deep Field where
we have conducted a narrow-band optical survey yielding a sample of
~5000 galaxies within 0.25 square degree to z ~ 1.6 detected by
H-alpha, [O III], or [O II]. I will then discuss the on-going work
with the NEWFIRM H-alpha Survey where we have extended past
narrowband H-alpha searches to z ~ 0.8 using near-infrared imaging
with continued efforts to probe z ~ 2.2. The NEWFIRM H-alpha
Survey covers 1 square degrees for ~400 z = 0.8 H-alpha emitters.
Finally, I will describe the first Lyman break survey to select
star-forming galaxies at z ~ 2 using deep, wide GALEX
near-ultraviolet imaging. I will also compare different z ~ 2
photometric techniques (LBG, BzK, BX/BM) to provide a more
comprehensive view of the galaxy population, including dusty
star-forming galaxies. The comparison reveals a good but imperfect
(50%) overlap, indicating that these photometric techniques are
complementary. We also find that a large fraction of the star
formation at z ~ 2 is obscured by dust, which popular NIR color
selections are able to cull.
I will also discuss the future of spectroscopic high redshift
surveys in light of the results presented in this talk.
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