- My main interests are Observational Cosmology and new astronomical instruments. My group (4 graduate students and one postdoc) gets most of its data from the Hubble Space Telescope (HST), the University of California's Lick Observatory (San Jose) and the Keck Observatory (Hawaii), which we operate with Caltech. These are such exciting times for astronomy, that most of us doubt that the research opportunities will ever be as good as during the next five years. The HST is producing excellent data, and Keck is 100 times faster than any other telescope in the world. It can easily make observations well beyond the reach of other telescopes, and it will have no competitors for 5 years. There is much more to do than we have time for, so we are using these advantages to tackle major questions with wide-spread implications for cosmology and galaxy formation.
- - Far Ultraviolet Absorption Spectra of Quasars: How to Find Missing Hot Gas and Metals. With D.A. Verner, and P.D. Barthel. Astrophys. J. 20, (1994), in press.
- - Upper Limit on Metals in Quasar Lyman-a Forest Clouds: Absence of C IV Lines in Echelle Spectra. Astrophs. J. Lett., 424, L87 (1994).
- - On the Lack of Emission or Absorption in the Lyman Continuum of QSOs: What is the Source of the Lyman Continuum Radiation, and Where are the Broad Line Clouds? Bulletin Amer. Astron. Soc. 25, 1432 (1993).
- - Lick Slit Spectra of Thirty-eight Objective Prism Quasar Candidates and Low Metallicity Halo Stars. Astrophys. J. 106, 426 (1993).
- - Statistical Issues Concerning Quasar Absorption Line Systems. Statistical Challenges in Modern Astronomy, Ed. G.J. Babu and E.D. Feigelson (Springer-Verlag), 83-102 (1992).
- - Upper Limit on Periodicity in the 3-Dimensional Large-Scale Distribution of Matter. With J. Sandoval and X.-M. Fan. Astrophys. J. Suppl. 405, 57 (1992).
- - A Survey of Very Low Redshift MG II Absorption Systems in QSO Spectra. With P. Boissé, et al. Astron. Astrophys. 262, 401 (1992).
- - QSO Emission Line Velocity Shifts and New Unbiased Redshifts. With X.M. Fan. Astrophys. J. Suppl., 79, 1 (1992).