• Publications
  • Influence
THE COSMOLOGICAL BARYON DENSITY FROM THE DEUTERIUM-TO-HYDROGEN RATIO IN QSO ABSORPTION SYSTEMS: D/H TOWARD Q1243+3047
We report the detection of deuterium absorption at redshift 2.525659 toward Q1243+3047. We describe improved methods to estimate the deuterium to hydrogen abundance ratio (D/H) in absorption systems,Expand
  • 306
  • 53
  • PDF
The golden standard type ia supernova 2005cf: Observations from the ultraviolet to the near-infrared wavebands
We present extensive photometry at ultraviolet (UV), optical, and near-infrared (NIR) wavelengths, as well as dense sampling of optical spectra, for the normal Type Ia supernova (SN Ia) 2005cf. TheExpand
  • 122
  • 23
  • PDF
Intrinsic Properties of the ⟨z⟩ = 2.7 Lyα Forest from Keck Spectra of Quasar HS 1946+7658
We present the highest quality Ly? forest spectra published to date. We have complete 7.9 km s-1 FWHM spectra between the Ly? and Ly? emission lines of the bright, high-redshift (V = 15.9, z = 3.05)Expand
  • 92
  • 19
  • PDF
The H I opacity of the intergalactic medium at redshifts 1.6 < z < 3.2
We use high-quality echelle spectra of 24 quasi-stellar objects to provide a calibrated measurement of the total amount of Lyα forest absorption (DA) over the redshift range 2.2 < z < 3.2. OurExpand
  • 77
  • 19
  • PDF
Intergalactic HeII absorption towards QSO 1157+3143
We report the discovery of a further line of sight allowing detection of He  Lyα absorption by the intergalactic medium. A HST/STIS survey of 32 bright z ∼ 3 quasars selected from the HamburgExpand
  • 38
  • 18
  • PDF
The UCSD HIRES/KECK I Damped Lya Abundance Database: IV. Probing Galactic Enrichment Histories with Nitrogen
We present 14 N^0 measurements from our HIRES/Keck database of damped Lya abundances. These data are combined with measurements from the recent and past literature to build an homogeneous, uniformExpand
  • 69
  • 17
  • PDF
PTF 11kx: A Type Ia Supernova with a Symbiotic Nova Progenitor
Stellar Explosions Stars that are born with masses greater than eight times that of the Sun end their lives in luminous explosions known as supernovae. Over the past decade, access to improved skyExpand
  • 240
  • 16
  • PDF
Ionization and Abundances of Intergalactic Gas
We will briefly present four results — three from the W.M. Keck telescope, and one from the HST — on the abundances and ionization of the Lyman-alpha forest clouds and the intergalactic medium atExpand
  • 90
  • 16
Continuous statistics of the Lyα forest at 0 <z < 1.6: the mean flux, flux distribution and autocorrelation fromHST FOS spectra
We measure the amount of absorption in the Lya forest at 0 < z < 1.6 in Hubble Space Telescope Faint Object Spectrograph spectra of 74 quasi-stellar objects (QSOs). Starting with a 334 QSO sampleExpand
  • 34
  • 14
  • PDF
Toward a Precise Measurement of Matter Clustering: Lyα Forest Data at Redshifts 2-4
We measure the filling factor, correlation function, and power spectrum of transmitted flux in a large sample of Lyα forest spectra, comprised of 30 Keck HIRES spectra and 23 Keck LRIS spectra. WeExpand
  • 321
  • 13
  • PDF
...
1
2
3
4
5
...