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The Chandra Deep Field North Survey. XIII. 2 Ms Point-Source Catalogs
We present point-source catalogs for the ?2 Ms exposure of the Chandra Deep Field North, currently the deepest X-ray observation of the universe in the 0.5?8.0 keV band. Five hundred and three (503)Expand
New Insight on Galaxy Formation and Evolution from Keck Spectroscopy of the Hawaii Deep Fields
We present the results of spectroscopic studies with the LRIS spectrograph on Keck of two of the Hawaii deep survey fields. The 393 objects observed cover an area of 26.2 square arcmin and constituteExpand
Caltech Faint Galaxy Redshift Survey. X. A Redshift Survey in the Region of the Hubble Deep Field North
A redshift survey has been carried out in the region of the Hubble Deep Field North using the Low Resolution Imaging Spectrograph (LRIS) at the Keck Observatory. The resulting redshift catalog, whichExpand
Resolving the extragalactic hard X-ray background
A deep survey using the Chandra satellite detects hard X-ray sources that could be active nuclei in dust-enshrouded galaxies or a population of quasars at extremely high redshift. Expand
The Cosmic evolution of hard x-ray selected active galactic nuclei
We use highly spectroscopically complete deep and wide-area Chandra surveys to determine the cosmic evolution of hard X-ray–selected active galactic nuclei (AGNs). For the deep fields, we supplementExpand
Metal enrichment and ionization balance in the Lyman alpha forest at z = 3
The recent discovery of carbon in close to half of the low neutral hydrogen column density [$N({\rm H~I}) > 3\ten{14}\cm2$] Lyman forest clouds toward $z \sim 3$ quasars has challenged the widelyExpand
We have measured the redshift evolution of the density of Lyman limit systems (LLSs) in the intergalactic medium over the redshift range 0 < z < 6. We have used two new quasar samples to (1) improveExpand
The Distribution of column densities and b values in the Lyman-alpha forest
We describe the properties of the Ly$\alpha$ forest in the column density range $\nhi \geq 2\times10^{12}$ cm$^{-2}$ based on 1056 lines in the wavelength range 4300--5100\AA measured in extremelyExpand
An Atlas of z=5.7 and z=6.5 Ly alpha Emitters
We present an atlas of 88 z~5.7 and 30 z~6.5 Ly alpha emitters obtained from a wide-field narrowband survey. We combined deep narrowband imaging in 120A bandpass filters centered at 8150A and 9140AExpand