134 citations · 454 across the 9 of their papers we have counts for
7 papers · 1 filter
Precise limits on cosmological variability of the fine-structure constant with zinc and chromium quasar absorption lines
Michael T. Murphy, Adrian L. Malec, J. Xavier Prochaska
The strongest transitions of Zn and CrII are the most sensitive to relative variations in the fine-structure constant () among the transitions commonly observed in quasar abs…
Three-dimensional shapelets and an automated classification scheme for dark matter haloes
C. J. Fluke, A. L. Malec, P. D. Lasky +1
We extend the two-dimensional Cartesian shapelet formalism to d-dimensions. Concentrating on the three-dimensional case, we derive shapelet-based equations for the mass, centroid,…
First constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes
Freek van Weerdenburg, Michael T. Murphy, Adrian L. Malec +2
A high signal-to-noise spectrum covering the largest number of hydrogen lines (90 H2 lines and 6 HD lines) in a high redshift object was analyzed from an observation along the sigh…
A High-Velocity Narrow Absorption Line Outflow in the Quasar J212329.46-005052.9
F. Hamann, N. Kanekar, J. X. Prochaska +5
We report on a variable high-velocity narrow absorption line outflow in the redshift 2.3 quasar J2123-0050. Five distinct outflow systems are detected with velocity shifts from -97…
Cosmological concordance or chemical coincidence? Deuterated molecular hydrogen abundances at high redshift
J. Tumlinson, A. L. Malec, R. F. Carswell +8
We report two detections of deuterated molecular hydrogen (HD) in QSO absorption-line systems at . Toward J2123-0500, we find (HD) for a sub-DLA with me…
New limit on a varying proton-to-electron mass ratio from high-resolution optical quasar spectra
Adrian L. Malec, Ruth Buning, Michael T. Murphy +7
Molecular transitions recently discovered at redshift z_abs=2.059 toward the bright background quasar J2123-0050 are analysed to limit cosmological variation in the proton-to-elect…