Deep Spectroscopy of Ultra-Strong Emission Line Galaxies (2009)
Hu, Esther M., Cowie, Lennox L., Kakazu, Yuko, Barger, Amy J.
Ultra strong emission-line galaxies (USELs) with extremely high equivalent widths (EW(H beta) > 30A) can be used to pick out galaxies of extremely low metallicity in the z=0-1 redshift range. Large...
A comprehensive study of GRB 070125, a most energetic gamma-ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale A., Chevalier, Roger A., Macquart, Jean-Pierre, Kulkarni, Shri R., ...
We present a comprehensive multiwavelength analysis of the bright, long-duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter, and centimeter wave...
A comprehensive study of GRB 070125, a most energetic gamma-ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale A., Chevalier, Roger A., Macquart, Jean-Pierre, Kulkarni, Shri R., ...
We present a comprehensive multiwavelength analysis of the bright, long-duration gamma-ray burst GRB 070125, comprised of observations in gamma-ray, X-ray, optical, millimeter, and centimeter wave...
Ultradeep Near-Infrared Observations of GOODS 850-5 (2008)
Wang, Wei-Hao, Barger, Amy J., Cowie, Lennox L.
GOODS 850-5 is a hyperluminous radio-faint submillimeter source in the GOODS-N. Although it is generally agreed that GOODS 850-5 is at a high redshift z>~4, its exact redshift is unknown. While its...
A comprehensive study of GRB 070125, a most energetic gamma ray burst (2008)
Chandra, Poonam, Cenko, S. Bradley, Frail, Dale, Chevalier, Roger, Macquart, Jean-Pierre, Kulkarni, Shri, ...
We present a comprehensive multiwavelength analysis of the bright, long duration gamma-ray burst GRB 070125, comprised of observations in $\gamma$-ray, X-ray, optical, millimeter and centimeter...
To appear in The Astronomical Journal (2008)
High-z Ly, Search Objects Near, Lennox L. Cowie, Esther M. Hu
We present deep narrow-band ( = 5390 A, =77A) and multi-color observations of the Hubble Deep Field and the Hawaii Deep Field SSA22 obtained with the LRIS instrument at the Keck II 10-m telescope. It...
Submitted to Nature 7/05/95; revised 8/31/95 (2007)
Lennox L. Cowie, Esther M. Hu, Antoinette Songaila, Spectroscopic Studies
The complex problem of when and how galaxies formed has not until recently been susceptible of direct attack. It has been known for some time that the excessive number of blue galaxies counted at...
Redshift Clustering In The Hubble Deep Field (2007)
Judith Cohen Lennox, Judith G. Cohen, Lennox L. Cowie, David W. Hogg, Antoinette Songaila, Roger Blandford, ...
We present initial results from a redshift survey carried out with the low-resolution imaging spectrograph on the 10 m W. M. Keck Telescope in the Hubble Deep Field. In the redshift distribution of...
GOODS 850-5 -- A z>4 Galaxy Discovered in the Submillimeter? (2007)
Wang, Wei-Hao, Cowie, Lennox L., Van Saders, Jennifer, Barger, Amy J., Williams, Jonathan P.
We report an SMA interferometric identification of a bright submillimeter source, GOODS 850-5. This source is one of the brightest 850 um sources in the GOODS-N but is extremely faint at all other...
Mapping the Youngest Galaxies to Redshift One (2007)
Kakazu, Yuko, Cowie, Lennox L., Hu, Esther M.
We describe results of a narrow band search for ultra-strong emission line galaxies (USELs) with EW(H beta) > 30 A. 542 candidate galaxies are found in a half square degree survey using two ~100...
The Stellar Population of Lyman-alpha Emitting Galaxies at z ~ 5.7 (2006)
Lai, Kamson, Huang, Jia-Sheng, Fazio, Giovanni, Cowie, Lennox L., Hu, Esther M., Kakazu, Yuko
We present a study of three Lyman-alpha emitting galaxies (LAEs), selected via a narrow-band survey in the GOODS northern field, and spectroscopically confirmed to have redshifts of z ~ 5.65. Using...
Spectroscopic Studies of z~5.7 and z~6.5 Galaxies: Implications for Reionization (2005)
Hu, Esther M., Cowie, Lennox L., Capak, Peter, Kakazu, Yuko
The recent development of large, complete samples which identify high-redshift galaxies at z~5.7 and z~6.5 from deep, wide-field surveys provides detailed information on the earliest galaxies, their...
The Team Keck Treasury Redshift Survey of the GOODS-North Field (2004)
Wirth, Gregory D., Willmer, Christopher N. A., Amico, Paola, Chaffee, Frederic H., Goodrich, Robert W., Kwok, Shui, ...
We report the results of an extensive imaging and spectroscopic survey in the GOODS-North field completed using DEIMOS on the Keck II telescope. Observations of 2018 targets in a magnitude-limited...
Faint 6.7 micron galaxies and their contributions to the stellar mass density in the universe (2004)
Sato, Yasunori, Cowie, Lennox L., Kawara, Kimiaki, Matsuhara, Hideo, Okuda, Haruyuki, Sanders, David B., ...
Faint 6.7um Galaxies and their Contributions to the Stellar Mass Density in the Universe (2003)
Sato, Yasunori, Cowie, Lennox L., Kawara, Kimiaki, Matsuhara, Hideo, Okuda, Haruyuki, Sanders, David B., ...
We discuss the nature of faint 6.7um galaxies detected with the mid-infrared camera ISOCAM on board the Infrared Space Observatory (ISO). The 23 hour integration on the Hawaii Deep Field SSA13 has...
The Luminosity Function of Lyman Alpha Emitters at Redshift z~5.7 (2003)
Hu, Esther M., Cowie, Lennox L., Capak, Peter, McMahon, Richard G., Hayashino, Tomoki, Komiyama, Yutaka
We report results of a deep wide-field narrowband survey for redshift z~5.7 Ly alpha emitters carried out with SuprimeCam on Subaru 8.3-m telescope. Deep narrowband imaging of the SSA22 field through...
Huang, Jiasheng Sheng, Glazebrook, Karl, Cowie, Lennox L., Tinney, C.
We present the K-band local luminosity function derived from a sample of 1056 bright (K < 15) K-selected galaxies from the Hawaii+Anglo-Australian Observatory (AAO) K-band redshift survey. The...
Huang, Jiasheng Sheng, Glazebrook, Karl, Cowie, Lennox L., Tinney, C.
We present the K-band local luminosity function derived from a sample of 1056 bright (K < 15) K-selected galaxies from the Hawaii+Anglo-Australian Observatory (AAO) K-band redshift survey. The...
Wilson, Gillian, Cowie, Lennox L., Barger, Amy J., Burke, D. J.
We investigate the evolution of the universal rest-frame ultraviolet luminosity density from z = 1.5 to the present. We analyze an extensive sample of multicolor data (U', B, V = 24.5) plus...
Early-Type Halo Masses from Galaxy-Galaxy Lensing (2002)
Wilson, Gillian, Kaiser, Nick, Luppino, Gerard A., Cowie, Lennox L.
We present measurements of the extended dark halo profiles of bright early type galaxies at redshifts 0.1 to 0.9 obtained via galaxy-galaxy lensing analysis of images taken at the CFHT using the UH8K...
A Redshift z = 6.56 Galaxy Behind the Cluster Abell 370 (2002)
Hu, Esther M., Cowie, Lennox L., McMahon, Richard G., Capak, Peter, Iwamuro, Fumihide, Kneib, Jean-Paul, ...
We report the discovery of a redshift z=6.56 galaxy lying behind the cluster Abell 370. The object HCM 6A was found in a narrowband imaging survey using a 118 Angstrom bandpass filter centered at...
Approaching Reionization: The Evolution of the Lyman Alpha Forest from Redshifts Four to Six (2002)
Songaila, Antoinette, Cowie, Lennox L.
We analyze the Ly alpha forest properties of a sample of 15 high redshift quasars lying between z = 4.42 and z = 5.75, using high signal-to-noise spectra obtained with ESI on the Keck II 10 m...
Galaxy Halo Masses from Galaxy-Galaxy Lensing (2000)
Wilson, Gillian, Kaiser, Nick, Luppino, Gerard A., Cowie, Lennox L.
We present measurements of the extended dark halo profiles of bright early type galaxies at redshifts 0.1 to 0.9 obtained via galaxy-galaxy lensing analysis of images taken at the CFHT using the UH8K...
The Merger Rate to Redshift One from Kinematic Pairs: Caltech Faint Galaxy Redshift Survey XI (2000)
Carlberg, R. G., Cohen, Judith G., Patton, D. R., Blandford, Roger, Hogg, David W., Yee, H. K. C., ...
The rate of mass accumulation due to galaxy merging depends on the mass, density, and velocity distribution of galaxies in the near neighborhood of a host galaxy. The fractional luminosity in...
Galaxies at z>5: The View from Hawaii (1999)
Hu, Esther M., Cowie, Lennox L., McMahon, Richard G.
We review the properties of z>5 galaxies studied with HST and with the Keck telescopes, and discuss the detectability of Lyman alpha emission-line galaxies out to z~6.5 based on these data and...
Limits on the Gunn-Peterson Effect at z = 5 (1999)
Songaila, Antoinette, Hu, Esther M., Cowie, Lennox L., McMahon, Richard G.
We report new limits on the Gunn-Peterson effect at a redshift near 5 using spectroscopic observations of the z = 5 Sloan Digital Sky Survey quasar, J033829.31+002156.3, made with the LRIS and HIRES...
An Extremely Luminous Galaxy at z=5.74 (1999)
Hu, Esther M., McMahon, Richard G., Cowie, Lennox L.
We report the discovery of an extremely luminous galaxy lying at a redshift of z=5.74, SSA22-HCM1. The object was found in narrowband imaging of the SSA22 field using a 105 Angstrom bandpass filter...
Evidence for a Gradual Decline in the Universal Rest-Frame UV Luminosity Density for z < 1 (1999)
Cowie, Lennox L., Songaila, Antoinette, Barger, Amy J.
We have utilized various magnitude-limited samples drawn from an extremely deep and highly complete spectroscopic redshift survey of galaxies observed in seven colors in the Hawaii Survey Fields and...
The Density of Lyman-alpha Emitters at Very High Redshift (1998)
Hu, Esther M., Cowie, Lennox L., McMahon, Richard G.
We describe narrowband and spectroscopic searches for emission-line star forming galaxies in the redshift range 3 to 6 with the 10 m Keck II Telescope. These searches yield a substantial population...
Cowie, Lennox L., Hu, Esther M.
We present deep narrow-band (lambda = 5390 Angstroms, delta lambda = 77 Angstroms) and multi-color observations of the Hubble Deep Field and the Hawaii Deep Field SSA22 obtained with the LRIS...
The Redshift Evolution of the Lyman Alpha Forest (1997)
Kim, Tae-Sun, Hu, Esther M., Cowie, Lennox L., Songaila, Antoinette
We have analyzed the properties of low column density Lyman alpha forest clouds (12.8 < log N_HI < 16.0) toward 5 QSOs at different redshifts, using high signal-to-noise data from the HIRES...
The Evolution of the Distribution of Star Formation Rates in Galaxies (1997)
Cowie, Lennox L., Hu, Esther M., Songaila, Antoinette, Egami, Eiichi
A large deep and nearly complete B
A High Deuterium Abundance in the Early Universe (1996)
Songaila, Antoinette, Wampler, E. Joseph, Cowie, Lennox L.
The amount of deuterium relative to hydrogen (D/H) in clouds with close to primordial abundance seen at high redshift in the spectra of distant quasars currently provides the best estimate of the...
Magnitude-limited galaxy redshift surveys are now providing large samples of galaxies to beyond z=2, while color-selected and emission-line-selected samples are finding galaxies to z=4.7. A broad...
Redshift clustering in the Hubble Deep Field (1996)
Cohen, Judith G., Cowie, Lennox L., Hogg, David W., Songaila, Antoinette, Blandford, Roger, Hu, Esther M., ...
We present initial results from a redshift survey carried out with the Low Resolution Imaging Spectrograph on the 10~m W. M. Keck Telescope in the Hubble Deep Field. In the redshift distribution of...
Cowie, Lennox L., Songaila, Antoinette, Hu, Esther M., Cohen, J. G.
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 constitute...
Metal Enrichment and Ionization Balance in the Lyman $\alpha$ Forest at $z = 3$ (1996)
Songaila, Antoinette, Cowie, Lennox L.
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 widely...
REDSHIFT CLUSTERING IN THE HUBBLE DEEP FIELD 1 (1996)
Judith G. Cohen, Lennox L. Cowie, David W. Hogg, Roger Bl, Esther M. Hu, Patrick Shopbell
We present initial results from a redshift survey carried out with the Low Resolution Imaging Spectrograph on the 10 m W. M. Keck Telescope in the Hubble Deep Field. In the redshift distribution of...
Detection of Massive Forming Galaxies at Redshifts Greater than One (1995)
Cowie, Lennox L., Hu, Esther M., Songaila, Antoinette
The complex problem of when and how galaxies formed has not until recently been susceptible of direct attack. It has been known for some time that the excessive number of blue galaxies counted at...
Cowie, Lennox L., Songaila, Antoinette
We report new upper limits on any possible long-term time variation of the ratio of the electron to proton masses, $(m_e/m_p)$, the fine-structure constant, ($\alpha$), and the quantity $\alpha^2...
Faintest Galaxy Morphologies from $HST$ WFPC2 Imaging of the Hawaii Survey Fields (1995)
Cowie, Lennox L., Hu, Esther M., Songaila, Antoinette
We present very deep $HST$ WFPC2 images in the F814W filter of two Hawaii Survey fields, SSA13 and SSA22. Using these data with previous ground-based imaging and spectroscopy, we compare the colors,...
The Distribution of Column Densities and b Values in the Lyman-Alpha Forest (1995)
Hu, Esther M., Kim, Tae-Sun, Cowie, Lennox L., Songaila, Antoinette, Rauch, Michael
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 extremely...