Search Results - "De Bruyn, A. G."

Foreground simulations for the LOFAR–epoch of reionization experiment by Jelić, V., Zaroubi, S., Labropoulos, P., Thomas, R. M., Bernardi, G., Brentjens, M. A., De Bruyn, A. G., Ciardi, B., Harker, G., Koopmans, L. V. E., Pandey, V. N., Schaye, J., Yatawatta, S.

“…Future high-redshift 21-cm experiments will suffer from a high degree of contamination, due both to astrophysical foregrounds and to non-astrophysical and…”
Get full text

Power spectrum extraction for redshifted 21-cm Epoch of Reionization experiments: the LOFAR case by Harker, Geraint, Zaroubi, Saleem, Bernardi, Gianni, Brentjens, Michiel A., de Bruyn, A. G., Ciardi, Benedetta, Jelić, Vibor, Koopmans, Leon V. E., Labropoulos, Panagiotis, Mellema, Garrelt, Offringa, André, Pandey, V. N., Pawlik, Andreas H., Schaye, Joop, Thomas, Rajat M., Yatawatta, Sarod

“…One of the aims of the Low Frequency Array (LOFAR) Epoch of Reionization (EoR) project is to measure the power spectrum of variations in the intensity of…”
Get full text

Post-correlation radio frequency interference classification methods by Offringa, A. R., de Bruyn, A. G., Biehl, M., Zaroubi, S., Bernardi, G., Pandey, V. N.

“…We describe and compare several post-correlation radio frequency interference (RFI) classification methods. As data sizes of observations grow with new and…”
Get full text

Three episodes of jet activity in the Fanaroff–Riley type II radio galaxy B0925+420 by Brocksopp, C., Kaiser, C. R., Schoenmakers, A. P., De Bruyn, A. G.

“…We present Very Large Array images of a ‘double–double radio galaxy’, a class of objects in which two pairs of lobes are aligned either side of the nucleus. In…”
Get full text

Detection and extraction of signals from the epoch of reionization using higher-order one-point statistics by Harker, Geraint J. A., Zaroubi, Saleem, Thomas, Rajat M., Jelić, Vibor, Labropoulos, Panagiotis, Mellema, Garrelt, Iliev, Ilian T., Bernardi, Gianni, Brentjens, Michiel A., De Bruyn, A. G., Ciardi, Benedetta, Koopmans, Leon V. E., Pandey, V. N., Pawlik, Andreas H., Schaye, Joop, Yatawatta, Sarod

“…Detecting redshifted 21-cm emission from neutral hydrogen in the early Universe promises to give direct constraints on the epoch of reionization (EoR). It…”
Get full text

Non-parametric foreground subtraction for 21-cm epoch of reionization experiments by Harker, Geraint, Zaroubi, Saleem, Bernardi, Gianni, Brentjens, Michiel A., De Bruyn, A. G., Ciardi, Benedetta, Jelić, Vibor, Koopmans, Leon V. E., Labropoulos, Panagiotis, Mellema, Garrelt, Offringa, André, Pandey, V. N., Schaye, Joop, Thomas, Rajat M., Yatawatta, Sarod

“…One of the problems facing experiments designed to detect redshifted 21-cm emission from the epoch of reionization (EoR) is the presence of foregrounds which…”
Get full text

Fast large-scale reionization simulations by Thomas, Rajat M., Zaroubi, Saleem, Ciardi, Benedetta, Pawlik, Andreas H., Labropoulos, Panagiotis, Jelić, Vibor, Bernardi, Gianni, Brentjens, Michiel A., De Bruyn, A. G., Harker, Geraint J. A., Koopmans, Leon V. E., Mellema, Garrelt, Pandey, V. N., Schaye, Joop, Yatawatta, Sarod

“…We present an efficient method to generate large simulations of the epoch of reionization without the need for a full three-dimensional radiative transfer…”
Get full text

Foreground removal using fastica: a showcase of LOFAR-EoR by Chapman, Emma, Abdalla, Filipe B., Harker, Geraint, Jelić, Vibor, Labropoulos, Panagiotis, Zaroubi, Saleem, Brentjens, Michiel A., de Bruyn, A. G., Koopmans, L. V. E.

“…We introduce a new implementation of the fastica algorithm on simulated Low Frequency Array Epoch of Reionization data with the aim of accurately removing the…”
Get full text

Interstellar scintillation as the origin of the rapid radio variability of the quasar J1819+3845 by de Bruyn, A. G, Dennett-Thorpe, J

“…The liberation of gravitational energy as matter falls onto a supermassive black hole at the centre of a galaxy is believed to explain the high luminosity of…”
Get full text

A comprehensive radio view of the extremely bright gamma-ray burst 130427A by van der Horst, A. J., Paragi, Z., de Bruyn, A. G., Granot, J., Kouveliotou, C., Wiersema, K., Starling, R. L. C., Curran, P. A., Wijers, R. A. M. J., Rowlinson, A., Anderson, G. A., Fender, R. P., Yang, J., Strom, R. G.

“…GRB 130427A was extremely bright as a result of occurring at low redshift whilst the energetics were more typical of high-redshift gamma-ray bursts (GRBs). We…”
Get full text

Polarization leakage in epoch of reionization windows – I. Low Frequency Array observations of the 3C196 field by Asad, K. M. B., Koopmans, L. V. E., Jelić, V., Pandey, V. N., Ghosh, A., Abdalla, F. B., Bernardi, G., Brentjens, M. A., de Bruyn, A. G., Bus, S., Ciardi, B., Chapman, E., Daiboo, S., Fernandez, E. R., Harker, G., Iliev, I. T., Jensen, H., Martinez-Rubi, O., Mellema, G., Mevius, M., Offringa, A. R., Patil, A. H., Schaye, J., Thomas, R. M., van der Tol, S., Vedantham, H. K., Yatawatta, S., Zaroubi, S.

“…Detection of the 21-cm signal coming from the epoch of reionization (EoR) is challenging especially because, even after removing the foregrounds, the residual…”
Get full text

Post-correlation filtering techniques for off-axis source and RFI removal by Offringa, A. R., de Bruyn, A. G., Zaroubi, S.

“…Techniques to improve the data quality of interferometric radio observations are considered. Fundaments of fringe frequencies in the u v-plane are discussed…”
Get full text

Constraints on cosmological parameters from the analysis of the cosmic lens all sky survey radio-selected gravitational lens statistics by Chae, K-H, Biggs, A D, Blandford, R D, Browne, I W A, De Bruyn, A G, Fassnacht, C D, Helbig, P, Jackson, N J, King, L J, Koopmans, L V E, Mao, S, Marlow, D R, McKean, J P, Myers, S T, Norbury, M, Pearson, T J, Phillips, P M, Readhead, A C S, Rusin, D, Sykes, C M, Wilkinson, P N, Xanthopoulos, E, York, T

“…We derive constraints on cosmological parameters and the properties of the lensing galaxies from gravitational lens statistics based on the final Cosmic Lens…”
Get full text

The Discovery of a Microarcsecond Quasar: J1819+3845 by Dennett-Thorpe, J, de Bruyn, A. G

“…We report on the discovery of a source that exhibits over 300% amplitude changes in radio flux density on the period of hours. This source, J1819+3845, is the…”
Get full text

Extremely anisotropic scintillations by Walker, M. A., De Bruyn, A. G., Bignall, H. E.

“…A small number of quasars exhibit interstellar scintillation on time-scales less than an hour; their scintillation patterns are all known to be anisotropic…”
Get full text

Realistic simulations of the Galactic polarized foreground: consequences for 21-cm reionization detection experiments by Jelić, Vibor, Zaroubi, Saleem, Labropoulos, Panagiotis, Bernardi, Gianni, de Bruyn, A. G., Koopmans, Léon V. E.

“…Experiments designed to measure the redshifted 21-cm line from the epoch of reionization (EoR) are challenged by strong astrophysical foreground contamination,…”
Get full text

Radio interferometric calibration using the SAGE algorithm by Kazemi, S., Yatawatta, S., Zaroubi, S., Lampropoulos, P., de Bruyn, A. G., Koopmans, L. V. E., Noordam, J.

“…The aim of the new generation of radio synthesis arrays such as LOw Frequency ARray (LOFAR) and Square Kilometre Array (SKA) is to achieve much higher…”
Get full text

The Cosmic Lens All-Sky Survey - I. Source selection and observations by Myers, S. T., Jackson, N. J., Browne, I. W. A., de Bruyn, A. G., Pearson, T. J., Readhead, A. C. S., Wilkinson, P. N., Biggs, A. D., Blandford, R. D., Fassnacht, C. D., Koopmans, L. V. E., Marlow, D. R., McKean, J. P., Norbury, M. A., Phillips, P. M., Rusin, D., Shepherd, M. C., Sykes, C. M.

“…The Cosmic Lens All-Sky Survey (CLASS) is an international collaborative programme which has obtained high-resolution radio images of over 10 000 flat-spectrum…”
Get full text

The Cosmic Lens All-Sky Survey - II. Gravitational lens candidate selection and follow-up by Browne, I. W. A., Wilkinson, P. N., Jackson, N. J. F., Myers, S. T., Fassnacht, C. D., Koopmans, L. V. E., Marlow, D. R., Norbury, M., Rusin, D., Sykes, C. M., Biggs, A. D., Blandford, R. D., de Bruyn, A. G., Chae, K.-H., Helbig, P., King, L. J., McKean, J. P., Pearson, T. J., Phillips, P. M., Readhead, A. C. S., Xanthopoulos, E., York, T.

“…We report the final results of the search for gravitationally lensed flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All-Sky Survey)…”
Get full text

Astronomical constraints on the cosmic evolution of the fine structure constant and possible quantum dimensions by Carilli, C L, Menten, K M, Stocke, J T, Perlman, E, Vermeulen, R, Briggs, F, de Bruyn, A G, Conway, J, Moore, C P

“…We present measurements of absorption by the 21 cm hyperfine transition of neutral hydrogen toward radio sources at substantial look-back times. These data are…”
Get full text