New searches for HI 21-cm in damped Lyman-alpha absorption systems (2009)
Curran, S. J., Tzanavaris, P., Darling, J. K., Whiting, M. T., Athreya, R., ...
We present the results of three separate searches for HI 21-cm absorption in a total of twelve damped Lyman-alpha absorption systems (DLAs) and sub-DLAs over the redshift range z = 0.86-3.37. We find...
Low-column density HVC and IVC gas in the halo of the Milky Way (2009)
Bekhti, N. Ben, Richter, P., Murphy, M. T.
Recent studies of the circumgalactic gaseous environment of the Milky Way have concentrated on the distribution, chemical composition, and physical properties of the most massive neutral gas clouds...
Henkel, C., Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, V. V., Braatz, J. A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
Henkel, C., Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, V. V., Braatz, J. A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS1830-211. Obtaining average radial velocities...
The Outer Halo Globular Clusters of M31 (2009)
Alves-Brito, A., Forbes, D. A., Mendel, J. T., Hau, G. K. T., Murphy, M. T.
We present Keck/HIRES spectra of 3 globular clusters in the outer halo of M31, at projected distances beyond ~80 kpc from M31. The measured recession velocities for all 3 globular clusters confirm...
Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
Henkel, Christian, Menten, K. M., Murphy, M. T., Jethava, N., Flambaum, Victor V., Braatz, James A., ...
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS 1830–211, which is by far the best known...
CaII and NaI absorption signatures from extraplanar gas in the halo of the Milky Way (2008)
Bekhti, N. Ben, Richter, P., Westmeier, T., Murphy, M. T.
We analyse absorption characteristics and physical conditions of extraplanar intermediate- and high-velocity gas to study the distribution of the neutral and weakly ionised Milky Way halo gas and its...
A Survey for Redshifted Molecular and Atomic Absorption Lines II (2008)
Curran, S. J., Whiting, M. T., Wiklind, T., Webb, J. K., Murphy, M. T., Purcell, C. R.
We present the results of a z>2.9 survey for HI 21-cm and molecular absorption in the hosts of radio quasars using the GMRT and the Tidbinbilla 70-m telescope. Previously published searches, which...
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,...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, J., Grazian, A., Vanzella, E., Dessauges, M., Viel, M., Pasquini, L., ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
Laser Frequency Combs for Astronomical Observations (2008)
Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, C., Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, L., ...
Curran, Stephen J., Whiting, Matthew T., Wiklind, Tommy, Webb, J. K., Murphy, M. T., Purcell, Cormac R.
We present the results of a z≥ 2.9 survey for H i 21-cm and molecular absorption in the hosts of radio quasars using the Giant Metrewave Radio Telescope and the Tidbinbilla 70-m telescope....
Revision of VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We critically review the current null results on a varying fine-structure constant, α, derived from Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar...
Connecting galaxy disk and extended halo gas kinematics (2008)
Kacprzak, Glenn G., Churchill, C.W., Steidel, C.C., Ceverino, D., Klypin, A.A., Murphy, M.T.
We have explored the galaxy disk/extended halo gas kinematic relationship using rotation curves (Keck/ESI) of ten intermediate redshift galaxies which were selected by Mg II halo gas absorption...
Curran, Stephen J., Whiting, Matthew T., Wiklind, Tommy, Webb, J. K., Murphy, M. T., Purcell, Cormac R.
We present the results of a z≥ 2.9 survey for H i 21-cm and molecular absorption in the hosts of radio quasars using the Giant Metrewave Radio Telescope and the Tidbinbilla 70-m telescope....
Revision of VLT/UVES constraints on a varying fine-structure constant (2008)
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We critically review the current null results on a varying fine-structure constant, α, derived from Very Large Telescope (VLT)/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar absorption...
Connecting galaxy disk and extended halo gas kinematics (2008)
Kacprzak, Glenn G., Churchill, C. W., Steidel, C. C., Ceverino, D., Klypin, A. A., Murphy, M. T.
We have explored the galaxy disk/extended halo gas kinematic relationship using rotation curves (Keck/ESI) of ten intermediate redshift galaxies which were selected by Mg II halo gas absorption...
S. J. Curran, J. K. Webb, R. Bandiera, E. Corbelli, M. T. Murphy, V. V. Flambaum
We present a catalogue of the 316 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Halo Gas Cross Sections And Covering Fractions of MgII Absorption Selected Galaxies (2007)
Kacprzak, G. G., Churchill, C. W., Steidel, C. C., Murphy, M. T.
We examine halo gas cross sections and covering fractions, f_c, of intermediate redshift MgII absorption selected galaxies. We computed statistical absorber halo radii, R_x, using current values of...
Connecting Galaxy Disk and Extended Halo Gas Kinematics (2007)
Kacprzak, G. G., Churchill, C. W., Steidel, C. C., Ceverino, D., Klypin, A. A., Murphy, M. T.
We have explored the galaxy disk/extended halo gas kinematic relationship using rotation curves (Keck/ESI) of ten intermediate redshift galaxies which were selected by MgII halo gas absorption...
Detection of broad 21-cm absorption at z = 0.656 in the complex sight-line towards 3C336 (2007)
Curran, S. J., Tzanavaris, P., Murphy, M. T., Webb, J. K., Pihlstroem, Y. M.
We report the detection of 21-cm absorption at z = 0.656 towards 1622+238 (3C336). The line is very broad with a Full-Width Half Maximum (FWHM) of 235 km/s, giving a velocity integrated optical depth...
Murphy, M. T., Udem, Th., Holzwarth, R., Sizmann, A., Pasquini, L., Araujo-Hauck, C., ...
We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...
Murphy, M. T., Tzanavaris, P., Webb, J. K., Lovis, C.
Echelle spectrographs currently provide some of the most precise and detailed spectra in astronomy, the interpretation of which sometimes depends on the wavelength calibration accuracy. In some...
Murphy, M. T., Curran, S. J., Webb, J. K., Menager, H., Zych, B. J.
A correlation between the metallicity, [M/H], and rest-frame MgII equivalent width, EW, is found from 49 DLAs and strong sub-DLAs drawn from the literature over the redshift range 0.23 sigma...
Revisiting VLT/UVES constraints on a varying fine-structure constant (2006)
Murphy, M. T., Webb, J. K., Flambaum, V. V.
Current analyses of VLT/UVES quasar spectra disagree with the Keck/HIRES evidence for a varying fine-structure constant, alpha. To investigate this we introduce a simple method for calculating the...
Tzanavaris, P., Murphy, M. T., Webb, J. K., Flambaum, V. V., Curran, S. J.
Nine quasar absorption spectra at 21-cm and UV rest-wavelengths are used to estimate possible variations in x=alpha^2 g_p mu, (alpha is the fine structure constant, g_p the proton g-factor and...
A survey for redshifted molecular and atomic absorption lines I (2006)
Curran, S. J., Whiting, M. T., Murphy, M. T., Webb, J. K., Longmore, S. N., Pihlstroem, Y. M., ...
We are currently undertaking a large survey for redshifted atomic and molecular absorption ... only one clear and one tentative detection were obtained: HI absorption at z = 0.097 in PKS 1555-140 and...
Aldenius, M., Johansson, S., Murphy, M. T.
The most precise method of investigating possible space-time variations of the fine-structure constant, using high-redshift quasar absorption lines, is the many-multiplet (MM) method. For reliable...
A CH3CN and HCO+ survey towards southern methanols masers associated with star formation (2006)
Purcell, C. R., Balasubramanyam, R., Burton, M. G., Walsh, A. J., Minier, V., Hunt-Cunningham, M. R., ...
A CH3CN and HCO+ survey towards southern methanols masers associated with star formation (2006)
Purcell, C. R., Balasubramanyam, R., Burton, M. G., Walsh, A. J., Minier, V., Hunt-Cunningham, M. R., ...
A CH3CN and HCO+ survey towards southern methanol masers associated with star formation (2005)
Purcell, C. R., Balasubramanyam, R., Burton, M. G., Walsh, A. J., Minier, V., Hunt-Cunningham, M. R., ...
We present the initial results of a 3-mm spectral line survey towards 83 methanol maser selected massive star-forming regions. Here we report observations of the J=5-4 and 6-5 rotational transitions...
Bouche, Nicolas, Murphy, M. T., Peroux, C., Csabai, I.
We study the cross-correlation between 716 MgII quasar absorption systems and about 100,000 Luminous Red Galaxies (LRGs) selected from the Sloan Digital Sky Survey Data Release 3 in the redshift...
Fenner, Y., Murphy, M. T., Gibson, B. K.
At redshifts z_abs < 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, alpha, rely on the comparison of MgII and FeII transition wavelengths. One...
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Fenner, Yeshe, Murphy, M. T., Gibson, B. K.
Abstract not available.
Tzanavaris, P., Webb, J. K., Murphy, M. T., Flambaum, V. V., Curran, S. J.
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 factor, and...
Spin temperatures and covering factors for HI 21-cm absorption in damped Lyman-alpha systems (2004)
Curran, S. J., Murphy, M. T., Pihlstroem, Y. M., Webb, J. K., Purcell, C. R.
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 & Chengaulr (2003) have...
The clustering of Luminous Red Galaxies around MgII absorbers (2004)
Bouche, N., Murphy, M. T., Peroux, C.
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 redshift range 0.4
Berengut, J. C., Dzuba, V. A., Flambaum, V. V., Kozlov, M. G., Marchenko, M. V., Murphy, M. T., ...
Theories unifying gravity with other interactions suggest spatial and temporal variation of fundamental ``constants'' in the Universe. A change in the fine structure constant, alpha, could be...
We use Sloan Digital Sky Survey Data Release 2 QSO spectra to constrain the dust-reddening caused by intervening damped Lyman-alpha systems (DLAs). Comparing the spectral index distribution of a 70...
Molecular fraction limits in damped Lyman-alpha absorption systems (2004)
Curran, S. J., Murphy, M. T., Pihlstroem, Y. M., Webb, J. K., Bolatto, A. D., Bower, G. C.
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 absorption systems...
Atomic and Molecular Absorption at High Redshift (2003)
Curran, S. J., Webb, J. K., Murphy, M. T., Pihlström, Y. M.
Strong constraints on possible variations in fundamental constants can be derived from HI 21-cm and molecular rotational absorption lines observed towards quasars. With the aim of forming a...
Deep Searches for High Redshift Molecular Absorption (2003)
Curran, S. J., Webb, J. K., Murphy, M. T., Kuno, N.
Millimetre-band scans of the frequency space towards optically dim quasars is potentially a highly efficient method for detecting new high redshift molecular absorption systems. Here we describe...
H_2-bearing damped Lyman-alpha systems as tracers of cosmological chemical evolution (2003)
Murphy, M. T., Curran, S. J., Webb, J. K.
The chemical abundances in damped Lyman-alpha systems (DLAs) show more than 2 orders of magnitude variation at a given epoch, possibly because DLAs arise in a wide variety of host galaxies. This...
Murphy, M. T., Flambaum, V. V., Webb, J. K., Dzuba, V. V., Prochaska, J. X., Wolfe, A. M.
We present evidence for variations in the fine-structure constant from Keck/HIRES spectra of 143 quasar absorption systems over the redshift range 0.2 < z_abs < 4.2. This includes 15 new systems,...
Murphy, M. T., Webb, J. K., Flambaum, V. V.
[Abridged] We previously presented evidence for a varying fine-structure constant, alpha, in two independent samples of Keck/HIRES QSO spectra. Here we present a detailed many-multiplet analysis of a...
Murphy, M. T., Curran, S. J., Webb, J. K.
We describe initial results of a search for redshifted molecular absorption toward four millimetre-loud, optically faint quasars. A wide frequency bandwidth of up to 23 GHz per quasar was scanned...
Murphy, M. T., Curran, Stephen J., Webb, J. K.
We describe initial results of a search for redshifted molecular absorption towards four millimetre-loud, optically faint quasars. A wide frequency bandwidth of up to 23 GHz per quasar was scanned...
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We have previously presented evidence for a varying fine-structure constant, α, in two independent samples of Keck/HIRES quasi-stellar object (QSO) absorption spectra. Here we present a detailed...
Does the fine structure constant vary?: a detailed investigation into systematic effects (2003)
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We have previously presented 5.7 σ evidence for a smaller αat redshifts 0.2 < zabs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: Δα/α = (-0.57 ± 0.10) x10-5. A non-zero
Murphy, M. T., Curran, Stephen J., Webb, J. K.
We describe initial results of a search for redshifted molecular absorption towards four millimetre-loud, optically faint quasars. A wide frequency bandwidth of up to 23 GHz per quasar was scanned...
Murphy, M. T., Webb, J. K., Flambaum, Victor V.
We have previously presented evidence for a varying fine-structure constant, α, in two independent samples of Keck/HIRES quasi-stellar object (QSO) absorption spectra. Here we present a detailed...
Does the fine structure constant vary?: a detailed investigation into systematic effects (2003)
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Curran, Stephen J.
We have previously presented 5.7 σ evidence for a smaller αat redshifts 0.2 < zabs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: Δα/α = (-0.57 ± 0.10) x10-5. A non-zero
A 22GHz search for molecular absorption at z~3 with the upgraded ATCA (2002)
Curran, S. J., Murphy, M. T., Webb, J. K., Pihlstroem, Y. M.
We report a lambda > 1cm search for rotational molecular absorption towards quasars, now possible with the upgraded Australia Telescope Compact Array (ATCA). The targets were PKS 0201+113, PKS...
Webb, J. K., Murphy, M. T., Flambaum, V. V., Curran, S. J.
We report preliminary results from a third sample of quasar absorption line spectra from the Keck telescope which has been studied to search for any possible variation of the fine structure constant,...
Does the fine structure constant vary? A detailed investigation into systematic effects (2002)
Murphy, M. T., Webb, J. K., Flambaum, V. V., Curran, S. J.
We have previously presented 5.7-sigma evidence for a smaller alpha at redshifts 0.2 < z_abs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: da/a = (-0.57 +/- 0.10) x 10^{-5}. A...
Time evolution of the fine structure constant (2002)
Murphy, M. T., Webb, J. K., Flambaum, V. V., Curran, S. J.
We present a short review of the current quasar (QSO) absorption line constraints on possible variation of the fine structure constant, alpha = e^2/(hbar*c). Particular attention is paid to recent...
A search for molecules in damped Lyman-alpha absorbers occulting millimetre-loud quasars (2002)
Curran, S. J., Murphy, M. T., Webb, J. K., Rantakyro, F., Johansson, L. E. B., Nikolic, S.
We have used the SEST 15-metre and Onsala 20-metre telescopes to perform deep (r.m.s. >~ 30 mJy) integrations of various molecular rotational transitions towards damped Lyman-alpha absorption systems...
Curran, S. J., Webb, J. K., Murphy, M. T., Bandiera, R., Corbelli, E., Flambaum, V. V.
We present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Curran, Stephen J., Webb, J. K., Murphy, M. T., Bandiera, Rino, Corbelli, Edvige, Flambaum, Victor V.
We present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Curran, Stephen J., Webb, J. K., Murphy, M. T., Bandiera, Rino, Corbelli, Edvige, Flambaum, Victor V.
We present a catalogue of the 322 damped Lyman alpha absorbers taken from the literature. All damped Lyman alpha absorbers are included, with no selection on redshift or quasar magnitude. Of these,...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Drinkwater, M. J., Combes, F., Wiklind, T.
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21-cm absorption with corresponding molecular...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Drinkwater, M. J., Combes, F., Wiklind, T.
QSO absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H I 21cm absorption with corresponding molecular (rotational)...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Drinkwater, M. J., Combes, F., Wiklind, T.
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21-cm absorption with corresponding molecular...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Dzuba, V. A., Churchill, Christopher W., Prochaska, Jason X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar (QSO) absorption-line spectra with...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Churchill, Christopher W., Prochaska, Jason X.
Comparison of quasar (QSO) absorption spectra with laboratory spectra allows us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we...
Relativistic effects in NiII and the search for variation of the fine-structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, M. T., Webb, J. K.
Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical “constants” in the Universe. Detection of high redshift absorption...
Further evidence for cosmological evolution of the fine structure constant (2001)
Webb, J. K., Murphy, M. T., Flambaum, Victor V., Dzuba, V. A., Barrow, John D., Churchill, Christopher W., ...
We describe the results of a search for time variability of the fine structure constant α using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Drinkwater, Michael J., Combes, Francoise, Wiklind, Tommy
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of HI 21-cm absorption with corresponding molecular...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Prochaska, Jason X., Wolfe, Arthur M.
Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Drinkwater, M. J., Combes, F., Wiklind, T.
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21-cm absorption with corresponding molecular...
Further Evidence for Cosmological Evolution of the Fine Structure Constant (2001)
Barrow, J. D., Dzuba, V. A., Flambaum, V. V., Murphy, M. T., Webb, J. K.
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Dzuba, V. A., Churchill, Christopher W., Prochaska, Jason X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar (QSO) absorption-line spectra with...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Churchill, Christopher W., Prochaska, Jason X.
Comparison of quasar (QSO) absorption spectra with laboratory spectra allows us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we...
Relativistic effects in NiII and the search for variation of the fine-structure constant (2001)
Dzuba, V. A., Flambaum, Victor V., Murphy, M. T., Webb, J. K.
Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical “constants” in the Universe. Detection of high redshift absorption...
Further evidence for cosmological evolution of the fine structure constant (2001)
Webb, J. K., Murphy, M. T., Flambaum, Victor V., Dzuba, V. A., Barrow, John D., Churchill, Christopher W., ...
We describe the results of a search for time variability of the fine structure constant α using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Drinkwater, Michael J., Combes, Francoise, Wiklind, Tommy
Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of HI 21-cm absorption with corresponding molecular...
Murphy, M. T., Webb, J. K., Flambaum, Victor V., Prochaska, Jason X., Wolfe, Arthur M.
Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We...
Further Evidence for Cosmological Evolution of the Fine Structure Constant (2000)
Webb, J. K., Murphy, M. T., Flambaum, V. V., Dzuba, V. A., Barrow, J. D., Churchill, C. W., ...
We describe the results of a search for time variability of the fine structure constant, alpha, using absorption systems in the spectra of distant quasars. Three large optical datasets and two...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Dzuba, V. A., Churchill, C. W., Prochaska, J. X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar absorption line spectra with laboratory...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Churchill, C. W., Prochaska, J. X.
Comparison of quasar absorption spectra with laboratory spectra allow us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we present an...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Prochaska, J. X., Wolfe, A. M.
Comparison of quasar absorption line spectra with laboratory spectra provides a precise probe for variability of the fine structure constant, alpha, over cosmological time-scales. We constrain...
Relativistic effects in Ni II and the search for variation of the fine structure constant (2000)
Dzuba, V. A., Flambaum, V. V., Murphy, M. T., Webb, J. K.
Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical ``constants'' in the Universe. Detection of high redshift absorption systems...
Catalogue of candidate emission-line objects in the small magellanic cloud (2000)
Murphy, M. T., Bessell, Michael S.
Hα and [O iii] narrow-band, wide-field (7×7 deg2), CCD images of the Small Magellanic Cloud were compared, and a catalogue of candidate planetary nebulae and Hα emission-line stars...
A method for detecting gravitational waves coincident with gamma-ray bursts (2000)
Murphy, M. T., Webb, J. K., Heng, Ik Siong
The mechanism for gamma-ray bursters and the detection of gravitational waves (GWs) are two outstanding problems facing modem physics. Many models of gamma-ray bursters predict copious GW emission,...
Catalogue of candidate emission-line objects in the small magellanic cloud (2000)
Murphy, M. T., Bessell, Michael S.
Hα and [O iii] narrow-band, wide-field (7×7 deg2), CCD images of the Small Magellanic Cloud were compared, and a catalogue of candidate planetary nebulae and Hα emission-line stars...
A method for detecting gravitational waves coincident with gamma-ray bursts (2000)
Murphy, M. T., Webb, J. K., Heng, Ik Siong
The mechanism for gamma-ray bursters and the detection of gravitational waves (GWs) are two outstanding problems facing modem physics. Many models of gamma-ray bursters predict copious GW emission,...
A method for detecting gravitational waves coincident with gamma ray bursts (1999)
Murphy, M. T., Webb, J. K., Heng, I. S.
The mechanism for gamma ray bursters and the detection of gravitational waves (GWs) are two outstanding problems facing modern physics. Many models of gamma ray bursters predict copious GW emission,...
One and Two Dimensional Spin Systems in the Regime Close to Deconfinement of Spinons (1999)
Byrnes, T. M. R., Murphy, M. T., Sushkov, O. P.
Based on the Majumdar-Ghosh chain we construct several spin models which allow us to investigate spinon dynamics in the regime close to deconfinement of spinons. We consider the J_1 - J_2 - \delta...
One- and two-dimensional spin systems in the regime close to deconfinement of spinons (1999)
Byrnes, Tim M. R., Murphy, M. T., Sushkov, Oleg P.
Based on the Majumdar-Ghosh chain we construct several spin models which allow us to investigate spinon dynamics in the regime close to deconfinement of spinons. We consider the J1-J2-δ model,...
One- and two-dimensional spin systems in the regime close to deconfinement of spinons (1999)
Byrnes, Tim M. R., Murphy, M. T., Sushkov, Oleg P.
Based on the Majumdar-Ghosh chain we construct several spin models which allow us to investigate spinon dynamics in the regime close to deconfinement of spinons. We consider the J1-J2-δ model,...