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Si and Mn Abundances in Damped Lya Systems with Low Dust Content
Max Pettini, Sara Ellison, Charles C. Steidel +2
We have measured the abundances of Zn, Si, Mn, Cr, Fe, and Ni in three damped Lyman alpha systems at redshifts z < 1 from high resolution echelle spectra of QSOs recorded with the…
LA Palma Night-Sky Brightness
Chris R. Benn, Sara L. Ellison
The brightness of the moonless night sky above La Palma was measured on 427 CCD images taken with the Isaac Newton and Jacobus Kapteyn Telescopes on 63 nights during 1987 - 1996. T…
KECK HIRES Spectroscopy of APM 08279+5255
Sara L. Ellison, Geraint F. Lewis, Max Pettini +5
With an optical R-band magnitude of 15.2, the recently discovered z=3.911 BAL quasar APM 08279+5255 is an exceptionally bright high redshift source. Its brightness has allowed us t…
Metal Abundances in the Lyman Alpha Forest
Sara L. Ellison, Geraint F. Lewis, Max Pettini +3
We present high S/N echelle spectra of the recently discovered ultraluminous QSO APM 08279+5255 and use these data to re-examine the abundance of Carbon in Ly alpha forest clouds.…