Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Pritchard, J. R."'
Autor:
Razavi-Ghods, Nima, Roque, Ian L. V., Carey, Steven H., Ely, John A., Handley, Will, Magro, Alessio, Chiello, Riccardo, Huang, Tian, Alexander, P., Anstey, D., Bernardi, G., Bevins, H. T. J., Cavillot, J., Croukamp, W., Cumner, J., Acedo, E. de Lera, de Villiers, D. I. L., Fialkov, A., Gessey-Jones, T., Gueuning, Q., Josaitis, A. T., Kulkarni, G., Leeney, S. A. K., Maiolino, R., Meerburg, P. D., Mittal, S., Pagano, M., Pegwal, S., Pieterse, C., Pritchard, J. R., Saxena, A., Scheutwinkel, K. H., Scott, P., Shen, E., Sims, P. H., Smirnov, O., Spinelli, M., Zarb-Adami, K.
We detail the the REACH radiometric system designed to enable measurements of the 21-cm neutral hydrogen line. Included is the radiometer architecture and end-to-end system simulations as well as a discussion of the challenges intrinsic to highly-cal
Externí odkaz:
http://arxiv.org/abs/2307.00099
Autor:
Acedo, E. de Lera, de Villiers, D. I. L., Razavi-Ghods, N., Handley, W., Fialkov, A., Magro, A., Anstey, D., Bevins, H. T. J., Chiello, R., Cumner, J., Josaitis, A. T., Roque, I. L. V., Sims, P. H., Scheutwinkel, K. H., Alexander, P., Bernardi, G., Carey, S., Cavillot, J., Croukamp, W., Ely, J. A., Gessey-Jones, T., Gueuning, Q., Hills, R., Kulkarni, G., Maiolino, R., Meerburg, P. D., Mittal, S., Pritchard, J. R., Puchwein, E., Saxena, A., Shen, E., Smirnov, O., Spinelli, M., Zarb-Adami, K.
Publikováno v:
Nature Astronomy 6, p 984 998, 2022
Observations of the 21-cm line from primordial hydrogen promise to be one of the best tools to study the early epochs of the Universe: the Dark Ages, the Cosmic Dawn, and the subsequent Epoch of Reionization. In 2018, the EDGES experiment caught the
Externí odkaz:
http://arxiv.org/abs/2210.07409
The formation of deformed liquid marbles via impact of drops onto powder beds is analysed using experimental and computational modelling approaches. Experimentally, particular attention is paid to determining a relationship between the maximum contac
Externí odkaz:
http://arxiv.org/abs/2111.00596
Autor:
Cumner, J., Acedo, E. De Lera, de Villiers, D. I. L., Anstey, D., Kolitsidas, C. I., Gurdon, B., Fagnoni, N., Alexander, P., Bernardi, G., Bevins, H. T. J., Carey, S., Cavillot, J., Chiello, R., Craeye, C., Croukamp, W., Ely, J. A., Fialkov, A., Gessey-Jones, T., Gueuning, Q., Handley, W., Hills, R., Josaitis, A. T., Kulkarni, G., Magro, A., Maiolino, R., Meerburg, P. D., Mittal, S., Pritchard, J. R., Puchwein, E., Razavi-Ghods, N., Roque, I. L. V., Saxena, A., Scheutwinkel, K. H., Shen, E., Sims, P. H., Smirnov, O., Spinelli, M., Zarb-Adami, K.
Following the reported detection of an absorption profile associated with the 21~cm sky-averaged signal from the Cosmic Dawn by the EDGES experiment in 2018, a number of experiments have been set up to verify this result. This paper discusses the des
Externí odkaz:
http://arxiv.org/abs/2109.10098
Autor:
Binnie, T., Pritchard, J. R.
We apply Bayesian statistics to perform model selection on different reionisation scenarios via the Multinest algorithm. Initially, we recover the results shown by 21CMMC for the parameter estimation of 21cmFAST models. We proceed to test several toy
Externí odkaz:
http://arxiv.org/abs/1903.09064
Publikováno v:
MNRAS, 449, 3202 (2015)
We investigate the impact of sinks of ionizing radiation on the reionization-era 21-cm signal, focusing on 1-point statistics. We consider sinks in both the intergalactic medium and inside galaxies. At a fixed filling factor of HII regions, sinks wil
Externí odkaz:
http://arxiv.org/abs/1501.01970
Autor:
Brown, M. L., Abdalla, F. B., Amara, A., Bacon, D. J., Battye, R. A., Bell, M. R., Beswick, R. J., Birkinshaw, M., Böhm, V., Bridle, S., Browne, I. W. A., Casey, C. M., Demetroullas, C., Enßlin, T., Ferreira, P. G., Garrington, S. T., Grainge, K. J. B., Gray, M. E., Hales, C. A., Harrison, I., Heavens, A. F., Heymans, C., Hung, C. L., Jackson, N. J., Jarvis, M. J., Joachimi, B., Kay, S. T., Kitching, T. D., Leahy, J. P., Maartens, R., Miller, L., Muxlow, T. W. B., Myers, S. T., Nichol, R. C., Patel, P., Pritchard, J. R., Raccanelli, A., Refregier, A., Richards, A. M. S., Riseley, C., Santos, M. G., Scaife, A. M. M., Schäfer, B. M., Schilizzi, R. T., Smail, I., Starck, J. -L., Szepietowski, R. M., Taylor, A. N., Whittaker, L., Wrigley, N., Zuntz, J.
We outline the prospects for performing pioneering radio weak gravitational lensing analyses using observations from a potential forthcoming JVLA Sky Survey program. A large-scale survey with the JVLA can offer interesting and unique opportunities fo
Externí odkaz:
http://arxiv.org/abs/1312.5618
Autor:
Burns, Jack O., Lazio, T. J. W., Bale, S. D., Bowman, J. D., Bradley, R. F., Carilli, C. L., Furlanetto, S. R., Harker, G. J. A., Loeb, A., Pritchard, J. R.
A concept for a new space-based cosmology mission called the Dark Ages Radio Explore (DARE) is presented in this paper. DARE's science objectives include (1) When did the first stars form? (2) When did the first accreting black holes form? (3) When d
Externí odkaz:
http://arxiv.org/abs/1106.5194
It is well established that between 380000 and 1 billion years after the Big Bang the Inter Galactic Medium (IGM) underwent a "phase transformation" from cold and fully neutral to warm (~10^4 K) and ionized. Whether this phase transformation was full
Externí odkaz:
http://arxiv.org/abs/1102.1891
Publikováno v:
A&A 527, A93 (2011)
Observations of anisotropies in the brightness temperature of the 21 cm line of neutral hydrogen from the period before reionization would shed light on the dawn of the first stars and galaxies. In this paper, we use large-scale semi-numerical simula
Externí odkaz:
http://arxiv.org/abs/1009.0950