Modelling the Galactic Magnetic Field on the Plane in 2D (2009)
Jaffe, T. R., Leahy, J. P., Banday, A. J., Leach, S. M., Lowe, S. R., Wilkinson, A.
We present a Markov chain Monte-Carlo (MCMC) method for modelling the Galactic magnetic field using total and polarised synchrotron emission data as well as rotation measures of extragalactic...
GMIMS: The Global Magneto-Ionic Medium Survey (2008)
Wolleben, M., Landecker, T. L., Carretti, E., Dickey, J. M., Fletcher, A., Gaensler, B. M., ...
The Global Magneto-Ionic Medium Survey (GMIMS) is a project to map the diffuse polarized emission over the entire sky, Northern and Southern hemispheres, from 300 MHz to 1.8 GHz. With an angular...
The AGN Outburst In Hercules A: Jet, Shocks And Cavities (2008)
Nulsen, P., McNamara, B.R., David, L.P., Wise, M., Leahy, J.P.
The AGN outburst in Hercules A is one of the most powerful measured. Chandra X-ray observations of Hercules A show that the radio source is surrounded by a shock front. The density and temperature...
Rubiño-Martín, J.A., Aliaga, A.M., Barreiro, R.B., Battye, R.A., Carreira, P., Cleary, K., ...
Out of the 41 published VSA individual pointings dedicated to cosmological [cosmic microwave background (CMB)] observations, 37 are found to be consistent with Gaussianity, whereas four pointings...
Non-Gaussianity in the Very Small Array CMB maps with Smooth-Goodness-of-fit tests (2006)
Rubino-Martin, Jose Alberto, Aliaga, Antonio M., Barreiro, R. B., Battye, Richard A., Carreira, Pedro, Cleary, Kieran, ...
(Abridged) We have used the Rayner & Best (1989) smooth tests of goodness-of-fit to study the Gaussianity of the Very Small Array (VSA) data. Out of the 41 published VSA individual pointings...
Cosmological parameter estimation using Very Small Array data out to ℓ= 1500 (2004)
Rebolo, R., Battye, R.A., Carreira, P., Cleary, K., Davies, R.D., Davis, R.J., ...
We estimate cosmological parameters using data obtained by the Very Small Array (VSA) in its extended configuration, in conjunction with a variety of other cosmic microwave background (CMB) data and...
Cosmological parameter estimation using Very Small Array data out to ℓ= 1500 (2004)
Rebolo, R., Battye, R.A., Carreira, P., Cleary, K., Davies, R.D., Davis, R.J., ...
We estimate cosmological parameters using data obtained by the Very Small Array (VSA) in its extended configuration, in conjunction with a variety of other cosmic microwave background (CMB) data and...
Estimating the bispectrum of the Very Small Array data (2004)
Smith, S., Rocha, R., Challinor, A., Battye, R.A., Carreira, P., Cleary, K., ...
We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in 2002 December, and compare our results with those obtained from Gaussian...
High sensitivity measurements of the CMB power spectrum with the extended Very Small Array (2004)
Dickinson, Clive, Battye, Richard A., Cleary, Kieran, Davies, Rod D., Davis, Richard J., Genova-Santos, Ricardo, ...
We present deep Ka-band ($\nu \approx 33$ GHz) observations of the CMB made with the extended Very Small Array (VSA). This configuration produces a naturally weighted synthesized FWHM beamwidth of...
Cosmological parameter estimation using Very Small Array data out to l=1500 (2004)
Rebolo, Rafael, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., ...
We estimate cosmological parameters using data obtained by the Very Small Array (VSA) in its extended configuration, in conjunction with a variety of other CMB data and external priors. Within the...
A multiband study of Hercules A. I. ROSAT observations of the intracluster medium (2004)
Gizani, Nectaria A. B., Leahy, J. P.
We have made ROSAT PSPC and HRI X-ray observations to study the intracluster gas surrounding the powerful radio source Hercules A. The cluster is luminous in X-rays (L_bol = 4.8x10^37 W), and the...
Estimating the bispectrum of the Very Small Array data (2004)
Smith, Sarah, Rocha, Graca, Challinor, Anthony, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, ...
We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in December 2002, and compare our results to those obtained from Gaussian...
Cosmological parameter estimation using Very Small Array data out to l? = 1500 (2004)
Rebolo, Rafael, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., ...
Searching for non-Gaussianity in the VSA data (2003)
Savage, Richard, Battye, Richard A., Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., ...
We have tested Very Small Array (VSA) observations of three regions of sky for the presence of non-Gaussianity, using high-order cumulants, Minkowski functionals, a wavelet-based test and a Bayesian...
Chandra Discovery of an X-ray Jet and Lobes in 3C 15 (2003)
Kataoka, J., Leahy, J. P., Edwards, P. G., Kino, M., Takahara, F., Serino, Y., ...
We report the Chandra detection of an X-ray jet in 3C 15. The peak of the X-ray emission in the jet is 4.1'' (a projected distance of 5.1 kpc) from the nucleus, and coincident with a component...
Synchrotron Polarization at High Galactic Latitude (2003)
Abidin, Z. Zainal, Leahy, J. P., Wilkinson, A., Reich, P., Reich, W., Wielebinski, R.
We present preliminary results from mapping the high-latitude Galactic polarization with the Effelsberg Telescope at $\lambda$21 cm. Structures on the resulting maps are mostly on the scale of...
A multiband study of Hercules A. II. Multifrequency VLA imaging (2003)
Gizani, Nectaria A. B., Leahy, J. P.
We have mapped the powerful radio galaxy Hercules A at six frequencies spanning 1295 to 8440 MHz using the VLA in all four configurations. Here we discuss the structure revealed in total intensity,...
Synchrotron polarization at high galactic latitude (2003)
Abidin, Z. Z., Leahy, J. P., Wilkinson, A., Reich, P., Reich, W., Wielebinski, R.
We present preliminary results from mapping the high-latitude galactic polarization with the Effelsberg Telescope at lambda21 cm. Structures on the resulting maps are mostly on the scale of several...
The CMB power spectrum out to l=1400 measured by the VSA (2002)
Grainge, Keith, Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., Dickinson, Clive, ...
We have observed the cosmic microwave background (CMB) in three regions of sky using the Very Small Array (VSA) in an extended configuration with antennas of beamwidth 2 degrees at 34 GHz. Combined...
Cosmological parameter estimation and Bayesian model comparison using VSA data (2002)
Slosar, Anze, Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., Dickinson, Clive, ...
We constrain the basic comological parameters using the first observations by the Very Small Array (VSA) in its extended configuration, together with existing cosmic microwave background data and...
Observations of the neutral gas and dust in the radio galaxy 3C305 (2002)
Jackson, N., Beswick, R., Pedlar, A., Cole, G. H., Sparks, W. B., Leahy, J. P., ...
We present MERLIN and Hubble Space Telescope (HST) observations of the central region of the nearby radio galaxy 3C305 and use them to study the gas and dust in this object. The MERLIN observations...
First results from the Very Small Array -- II. Observations of the CMB (2002)
Taylor, Angela C., Carreira, Pedro, Cleary, Kieran, Davies, Rod D., Davis, Richard J., Dickinson, Clive, ...
We have observed the cosmic microwave background temperature fluctuations in eight fields covering three separated areas of sky with the Very Small Array at 34 GHz. A total area of 101 square degrees...
Probing the pc- and kpc-scale environment of the powerful radio galaxy Hercules A (2001)
Gizani, Nectaria A. B., Garrett, M. A., Leahy, J. P.
We present the kpc-scale behaviour of the powerful extragalactic radio source Hercules A and the behaviour of the intracluster gas in which the radio source is situated. We have found that Hercules A...
Systematics of Microwave Polarimetry with the Planck LFI (2001)
Leahy, J. P., Yurchenko, V., Hastie, Morag, Bersanelli, M., Mandolesi, N.
The Planck Low Frequency Instrument will recover polarization by differencing the outputs from radiometers sensitive to orthogonal polarizations. We contrast the systematic errors that afflict such a...
Spectral Structure in FRII Radio Galaxies and Jets (2001)
Treichel, K., Rudnick, L., Hardcastle, M., Leahy, J. P.
Using spectral tomography to separate overlapping spectral features in a sample of FRII radio galaxies, we find a variety of spatial/spectral features that are not easily described in the context of...
Chandra X-Ray Detection of the Radio Hot Spots of 3C 295 (2000)
Harris, D. E., Nulsen, P., Ponman, T. J., Bautz, M., Cameron, R. A., David, L. P., ...
An observation of the radio galaxy 3C 295 during the calibration phase of the Chandra X-Ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio hot...
Chandra X-Ray Detection of the Radio Hot Spots of 3C 295 (2000)
Harris, D. E., Nulsen, P., Ponman, T. J., Bautz, M., Cameron, R. A., David, L. P., ...
An observation of the radio galaxy 3C 295 during the calibration phase of the Chandra X-Ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio hot...
Chandra X-Ray Detection of the Radio Hot Spots of 3C 295 (2000)
Harris, D. E., Nulsen, P., Ponman, T. J., Bautz, M., Cameron, R. A., David, L. P., ...
An observation of the radio galaxy 3C 295 during the calibration phase of the Chandra X-Ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio hot...
Chandra X-Ray Detection of the Radio Hot Spots of 3C 295 (2000)
Harris, D. E., Nulsen, P., Ponman, T. J., Bautz, M., Cameron, R. A., David, L. P., ...
An observation of the radio galaxy 3C 295 during the calibration phase of the Chandra X-Ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio hot...
Chandra X-Ray Detection of the Radio Hotspots of 3C295 (1999)
Harris, D. E., Nulsen, P. E. J., Ponman, T. P., Bautz, M., Cameron, R. A., David, L. P., ...
An observation of the radio galaxy 3C295 during the calibration phase of the Chandra X-ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio...
Testing minimum energy with powerful radio sources in clusters of galaxies (1999)
Leahy, J. P., Gizani, Nectaria A. B.
We analyze ROSAT data for cluster gas surrounding powerful radio galaxies, which is well fitted by a ``beta-model'' gas distribution, after allowing for a compact central source. The cluster thermal...
Harris, D. E., Leighly, K. M., Leahy, J. P.
By summing a large number of ROSAT High Resolution Imager (HRI) observations of the variable radio galaxy 3C 390.3, we demonstrate that the X-ray emission associated with the northern radio lobe...
Asymmetry of jets, lobe length and spectral index in quasars (1997)
Dennett-Thorpe, J., Bridle, A. H., Scheuer, P. A. G., Laing, R. A., Leahy, J. P.
The less depolarized lobe of a radio source is generally the lobe containing the jet (Laing-Garrington correlation) but the less depolarized lobe is also generally that with the flatter radio...
Comment on the Measurement of Cosmological Birefringence (1997)
Nodland and Ralston (astro-ph/9704196) claim evidence for a wavelength-independent cosmic birefringence. Although it has been shown (astro-ph/9704247, astro-ph/9704263) that the data analysed did not...
J. P. Leahy, M. J. Hardcastle, S. Komissarov, R. A. Perley, J. M. Riley, ...
VLA maps of total intensity and fractional polarization at 3.6 cm are presented for eleven radio galaxies, part of a sample of 29 nearby radio galaxies with P 178 ? 1:5 \Theta 10 25 W Hz \Gamma1 sr...
Effect of 6-hydroxydopamine on electrical self stimulation of the brain
Breese, G. R., Howard, J. L., Leahy, J. P.
In rats, after a single intracisternal injection of 6-hydroxydopamine (6-OHDA) electrical self stimulation was reduced by approximately 50%. The concentrations of noradrenaline and dopamine in the...