827 citations · 9.1k across the 126 of their papers we have counts for
4 papers · 1 filter
Limits on variations in fundamental constants from 21-cm and ultraviolet quasar absorption lines
P. Tzanavaris, J. K. Webb, M. T. Murphy +2
Quasar absorption spectra at 21-cm and UV rest-wavelengths are used to estimate the time variation of x=alpha^2 g_p mu, where alpha is the fine structure constant, g_p the proton g…
Spin temperatures and covering factors for HI 21-cm absorption in damped Lyman-alpha systems
S. J. Curran, M. T. Murphy, Y. M. Pihlstroem +2
We investigate the practice of assigning high spin temperatures to damped Lyman-alpha absorption systems (DLAs) not detected in HI 21-cm absorption. In particular, Kanekar & Chenga…
The clustering of Luminous Red Galaxies around MgII absorbers
N. Bouche, M. T. Murphy, C. Peroux
We study the cross-correlation between 212 MgII quasar absorption systems and \~20,000 Luminous Red Galaxies (LRGs) selected from the Sloan Digital Sky Survey Data Release 1 in the…
Molecular fraction limits in damped Lyman-alpha absorption systems
S. J. Curran, M. T. Murphy, Y. M. Pihlstroem +3
We have used the Green Bank Telescope (GBT) and Berkeley-Illinois-Maryland Association (BIMA) array to search for redshifted millimetre absorption in a sample of damped Lyman-alpha…