Lyman Alpha Emitting Galaxies at High Redshift: Direct Detection of Young Galaxies in a Young Universe
As late as 1995, the anticipated widespread population of primeval galaxies remained at large, lurking undetected at unknown redshifts, with undiscovered properties. We present results from our efforts to detect and characterize primeval galaxies by their signature high-redshift Lyman-alpha emission lines utilizing two observational techniques: serendipitous slit spectroscopy and narrowband imaging. By pushing these techniques to their utmost limits, we probe the Lyman-alpha-emitting galaxy population out to redshifts as high as z = 6.5. Galaxies at this epoch reside in a universe which is just 800 million years old, a mere 6% of its current age. As such, this work provides one account of the manner by which observational cosmology has recently shifted from merely marveling at the incredible lookback times implied by the first few high-redshift detections, to the routine assembly of high-redshift datasets designed to address specific astrophysical issues.
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absorption AGN activity band Barger Bunker candidates catalog central HDF comparatively component continuum break cosmic Cowie & Hu CXOHDFN Dawson distribution dust erg s_1 error bars Figure Flanking Field flux density fraction FWHM galaxy cluster Gaussian HDF-N high-redshift high-redshift Lya Hornschemeier Hubble Deep Field Keck Keck/DEIMOS Keck/LRIS km s_1 LALA LBGs line flux line profile luminosity functions Lya emission lines Lya line Lya luminosity functions Lya-emitters Lya-emitting galaxies Lyman-break galaxies magnitude Malhotra & Rhoads measured narrowband imaging near-infrared objects Observatory Observed Wavelength optical spectrum photometric redshifts photons pixel quasars radio galaxies radio source ratio reionization resolution rest frame Rest Wavelength rest-frame rest-frame equivalent widths result selection serendipitous slit spectroscopy slitmask spectra spectral categories spectroscopic spectroscopic redshift spiral galaxy star formation star-forming galaxies starburst galaxies starbursts Steidel stellar populations Stern & Spinrad target Telescope Type II AGN typical uncertainty velocity width W^st X-ray
Page 171 - Photometric Redshifts and High Redshift Galaxies, ed. RJ Weymann, LJ Storrie-Lombardi, M. Sawicki, & RJ Brunner (San Francisco: ASP), 111 Kaiser, N.