Liske, J., Pasquini, L., Bonifacio, P., Bouchy, F., Carswell, R. F., Cristiani, S., ...
CODEX and ESPRESSO are concepts for ultra-stable, high-resolution spectrographs at the E-ELT and VLT, respectively. Both instruments are well motivated by distinct sets of science drivers. However,...
Stringent null constraint on cosmological evolution of the proton-to-electron mass ratio (2008)
King, Julian A., Webb, J. K., Murphy, Michael T., Carswell, R. F.
We present a strong constraint on variation of the proton-to-electron mass ratio mu over cosmological time scales using molecular hydrogen transitions in optical quasar spectra. Using high quality...
The HST Sample of Radio-Loud Quasars: Emission Lines from (2007)
Beverley Wills Brotherton, Beverley J. Wills, M. S. Brotherton, D. Wills, K. L. Thompson, J. A. Baldwin, ...
g. 1 shows preliminary SPCA results, expanded on the right to show detail. The top panel shows the mean of 48 spectra between Lyff and Hfi. The second panel shows the standard deviation spectrum....
Alexander Potekhin, Er V. Ivanchik, Dmitry A. Varshalovich, Kenneth M. Lanzetta, Jack A. Baldwin, Gerard M. Williger, ...
Multidimensional cosmologies allow for variations of fundamental physical constants over the course of cosmological evolution, and different versions of the theories predict different time...
P. J. Outram, B. J. Boyle, R. F. Carswell, P. C. Hewett, R. E. Williams, R. P. Norris
We report on high resolution observations (R = 35000) of the Hubble Deep Field South QSO J2233-606 obtained with the University College London Echelle Spectrograph at the AAT. We present spectral...
Bolton, J. S., Viel, M., Haehnelt, M. G., Carswell, R. F.
We compare the improved measurement of the Lya forest flux probability distribution at 1.7
Bolton, J. S., Viel, M., Haehnelt, M. G., Carswell, R. F.
We have performed an extensive Voigt profile analysis of the neutral hydrogen (HI) and metal absorption present in a sample of 18 high resolution, high signal-to-noise QSO spectra observed with...
The Low-Redshift Lyman Alpha Forest toward PKS 0405-123 (2005)
Williger, G. M., Heap, S. R., Weymann, R. J., Dave, R., Ellingson, E., Carswell, R. F., ...
We present STIS 7km/s resolution data of the Ly-a forest toward PKS0405-123 (z=0.574). We make two samples. The strong sample (60 systems) has column density logNHI>13.3 over 0.002
Cosmological evolution of heavy-element and H-2 abundances (2004)
Curran, Stephen J., Webb, J. K., Murphy, Michael T., Carswell, R. F.
Spectroscopic observations of distant quasars have resulted in the detection of molecular hydrogen in intervening damped Lyman alpha absorption clouds (DLAs). We use observations compiled from...
Cosmological evolution of heavy-element and H-2 abundances (2004)
Curran, Stephen J., Webb, J. K., Murphy, Michael T., Carswell, R. F.
Spectroscopic observations of distant quasars have resulted in the detection of molecular hydrogen in intervening damped Lyman alpha absorption clouds (DLAs). We use observations compiled from...
Viel, M., Haehnelt, M. G., Carswell, R. F., Cristiani, S.
The flux power spectra of the Lyman-alpha forest from a sample of 27 QSOs taken with the high resolution echelle spectrograph UVES on VLT are presented. We find a similar fluctuation amplitude at the...
Viel, M., Haehnelt, M. G., Carswell, R. F.
We demonstrate that the lyman alpha forest flux power spectrum of ``randomised'' QSO absorption spectra is comparable in shape and amplitude to the flux power spectrum of the original observed...
Temperature fluctuations in the intergalactic medium (2002)
Theuns, T., Zaroubi, S., Kim, T. S., Tzanavaris, P., Carswell, R. F.
The temperature of the low-density intergalactic medium (IGM) is set by the balance between adiabatic cooling resulting from the expansion of the Universe, and photoheating by the ultraviolet (UV)...
Non-Voigt Lyman-alpha absorption line profiles (1999)
Outram, P. J., Carswell, R. F., Theuns, T.
Recent numerical simulations have lead to a paradigm shift in our understanding of the intergalactic medium, and the loss of a physical justification for Voigt profile fitting of the Lyman-alpha...
Large-scale structure in the Lyman-alpha forest II: analysis of a group of ten QSOs (1999)
Liske, J., Webb, J. K., Williger, G. M., Fernandez-Soto, A., Carswell, R. F.
The spatial distribution of Ly-alpha forest absorption systems towards ten QSOs has been analysed to search for large-scale structure over the redshift range 2.2 < z < 3.4. The QSOs form a closely...
The Lyman-alpha Forest and Heavy Element Systems of GB1759+7539 (1999)
Outram, P. J., Chaffee, F. H., Carswell, R. F.
(abridged) We present observations of the high-redshift QSO GB1759+7539 (z=3.05) obtained with HIRES on the Keck 10m telescope. The spectrum has a resolution of FWHM = 7 km/s, and a typical...
The absorption line spectrum of the QSO J2233-606 (1998)
Outram, P J, Boyle, B J, Carswell, R F, Hewett, P C, Williams, R E, Norris, R P
We report on high resolution observations (R=35000) of the Hubble Deep Field South QSO J2233-606 obtained with the University College London Echelle Spectrograph at the AAT. We present spectral data...
Large-scale structure in the Lyman-alpha forest -- A new technique (1998)
Liske, J., Webb, J. K., Carswell, R. F.
We present a new technique for detecting structure on Mpc scales in the Lyman-alpha forest. The technique is easy to apply in practice since it does not involve absorption line fitting but is rather...
Potekhin, A. Y., Ivanchik, A. V., Varshalovich, D. A., Lanzetta, K. M., Baldwin, J. A., Williger, G. M., ...
Multidimensional cosmologies allow for variations of fundamental physical constants over the course of cosmological evolution, and different versions of the theories predict different time...
A High Deuterium Abundance at z=0.7; Evidence for Cosmic Inhomogeneity? (1997)
Webb, J. K., Carswell, R. F., Lanzetta, K. M., Ferlet, R., Lemoine, M., Vidal-Madjar, A.
Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO 1718+4807 (selected because of apparently ideal characteristics for measuring D/H) yield a D/H significantly higher D/H than...
A High Deuterium Abundance at z=0.7 (1997)
Webb, J. K., Carswell, R. F., Lanzetta, K. M., Ferlet, R., Lemoine, M., Vidal-Madjar, A., ...
Of the light elements, the primordial abundance of deuterium, (D/H)_p, provides the most sensitive diagnostic for the cosmological mass density parameter Omega_B. Recent high redshift (D/H)...
Strong Clustering of High-Redshift Lyman-alpha Forest Absorption Systems (1996)
Fernandez-Soto, A., Lanzetta, K. M., Barcons, X., Carswell, R. F., Webb, J. K., Yahil, A.
We use new observations of very weak CIV absorption lines associated with high-redshift Lyman-alpha absorption systems to measure the high-redshift Lyman-alpha line two-point correlation function...
Wampler, E. J., Williger, G. M., Baldwin, J. A., Carswell, R. F., Hazard, C., McMahon, R. G.
We present results from 12 km/s resolution echelle spectroscopy of the bright $z=4.694$ QSO BR1202-0725. A preliminary analysis shows that high metallicity narrow line absorption clouds are present...
H-alpha emission lines in high-redshift quasars (1989)
ESPEY, BRIAN RUSSELL, Carswell, R. F., Bailey, J. A., Smith, M. G., Ward, M. J.
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