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A Definitive Survey for Lyman Limit Systems at z~3.5 with the Sloan Digital Sky Survey
J. Xavier Prochaska, John M. O'Meara, Gabor Worseck
We perform a semi-automated survey for tau>=2 Lyman Limit systems (LLSs) in quasar spectra from the Sloan Digital Sky Survey, Data Release 7. From a starting sample of 2473 quasars…
MASE: A New Data--Reduction Pipeline for the Magellan Echellette Spectrograph
John J. Bochanski, Joseph F. Hennawi, Robert A. Simcoe +7
We introduce a data reduction package written in Interactive Data Language (IDL) for the Magellan Echellete Spectrograph (MAGE). MAGE is a medium-resolution (R ~4100), cross-disper…
A Direct Measurement of the IGM Opacity to HI Ionizing Photons
J. Xavier Prochaska, Gabor Worseck, John M. O'Meara
We present a new method to directly measure the opacity from HI Lyman limit (LL) absorption k_LL along quasar sightlines by the intergalactic medium (IGM). The approach analyzes th…
Multi-wavelength observations of the energetic GRB 080810: detailed mapping of the broadband spectral evolution
K. L. Page, R. Willingale, E. Bissaldi +31
GRB 080810 was one of the first bursts to trigger both Swift and the Fermi Gamma-ray Space Telescope. It was subsequently monitored over the X-ray and UV/optical bands by Swift, in…
An Observational Determination of the Proton to Electron Mass Ratio in the Early Universe
Rodger I. Thompson, Jill Bechtold, John H. Black +6
In an effort to resolve the discrepancy between two measurements of the fundamental constant mu, the proton to electron mass ratio, at early times in the universe we reanalyze the…
A Survey of UV Bright Sources Behind the Halo of M31
Andrew Fittingoff, J. Xavier Prochaska, Jasonjot S. Kalirai +3
We have performed a wide-area ultraviolet (UV) imaging survey using the GALaxy Evolution eXplorer (GALEX) to search for bright, point-like UV sources behind M31's extended halo. Ou…