Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Sims, Peter H."'
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 2023
We present a comprehensive simulation-based study of the BayesEoR code for 21 cm power spectrum recovery when analytically marginalizing over foreground parameters. To account for covariance between the 21 cm signal and contaminating foreground emiss
Externí odkaz:
http://arxiv.org/abs/2302.04058
Autor:
Rogers, Alan E. E., Barrett, John P., Bowman, Judd D., Cappallo, Rigel, Lonsdale, Colin J., Mahesh, Nivedita, Monsalve, Raul A., Murray, Steven G., Sims, Peter H.
Scattering from objects near an antenna produce correlated signals from strong compact radio sources in a manner similar to those used by the Sea Interferometer to measure the radio source positions using the fine frequency structure in the total pow
Externí odkaz:
http://arxiv.org/abs/2212.04526
Autor:
Sims, Peter H., Bowman, Judd D., Mahesh, Nivedita, Murray, Steven G., Barrett, John P., Cappallo, Rigel, Monsalve, Raul A., Rogers, Alan E. E., Samson, Titu, Vydula, Akshatha K.
Accurately accounting for spectral structure in spectrometer data induced by instrumental chromaticity on scales relevant for detection of the 21-cm signal is among the most significant challenges in global 21-cm signal analysis. In the publicly avai
Externí odkaz:
http://arxiv.org/abs/2212.03875
Autor:
Murray, Steven G., Bowman, Judd D., Sims, Peter H., Mahesh, Nivedita, Rogers, Alan E. E., Monsalve, Raul A., Samson, Titu, Vydula, Akshatha Konakondula
We develop a Bayesian model that jointly constrains receiver calibration, foregrounds and cosmic 21cm signal for the EDGES global 21\,cm experiment. This model simultaneously describes calibration data taken in the lab along with sky-data taken with
Externí odkaz:
http://arxiv.org/abs/2209.03459
High fidelity radio interferometric data calibration that minimises spurious spectral structure in the calibrated data is essential in astrophysical applications, such as 21 cm cosmology, which rely on knowledge of the relative spectral smoothness of
Externí odkaz:
http://arxiv.org/abs/2206.13554
In a companion paper, we presented BayesCal, a mathematical formalism for mitigating sky-model incompleteness in interferometric calibration. In this paper, we demonstrate the use of BayesCal to calibrate the degenerate gain parameters of full-Stokes
Externí odkaz:
http://arxiv.org/abs/2206.13553
Autor:
Bevins, Harry T. J., Handley, William J., Lemos, Pablo, Sims, Peter H., Acedo, Eloy de Lera, Fialkov, Anastasia, Alsing, Justin
Bayesian analysis has become an indispensable tool across many different cosmological fields including the study of gravitational waves, the Cosmic Microwave Background and the 21-cm signal from the Cosmic Dawn among other phenomena. The method provi
Externí odkaz:
http://arxiv.org/abs/2205.12841
Autor:
Sims, Peter H., Pober, Jonathan C.
Cosmic Dawn, when the first stars and proto-galaxies began to form, is commonly expected to be accompanied by an absorption signature at radio frequencies. This feature arises as Lyman-$\alpha$ photons emitted by these first luminous objects couple t
Externí odkaz:
http://arxiv.org/abs/1910.03165
Autor:
Array, The Hydrogen Epoch of Reionization, Collaboration, Aguirre, James E., Beardsley, Adam P., Bernardi, Gianni, Bowman, Judd D., Bull, Philip, Carilli, Chris L., Dai, Wei-Ming, DeBoer, David R., Dillon, Joshua S., Ewall-Wice, Aaron, Furlanetto, Steve R., Gehlot, Bharat K., Gorthi, Deepthi, Greig, Bradley, Hazelton, Bryna J., Hewitt, Jacqueline N., Jacobs, Daniel C., Kern, Nicholas S., Kittiwisit, Piyanat, Kolopanis, Matthew, La Plante, Paul, Liu, Adrian, Ma, Yin-Zhe, Mdlalose, Mthokozisi, Mirocha, Jordan, Murray, Steven G., Parsons, Aaron R., Pober, Jonathan C., Sims, Peter H., Thyagarajan, Nithyanandan
In this white paper, we lay out a US roadmap for high-redshift 21 cm cosmology (30 < z < 6) in the 2020s. Beginning with the currently-funded HERA and MWA Phase II projects and advancing through the decade with a coordinated program of small-scale in
Externí odkaz:
http://arxiv.org/abs/1907.06440
Autor:
Sims, Peter H., Pober, Jonathan C.
The power spectrum of redshifted 21 cm emission brightness temperature fluctuations is a powerful probe of the Epoch of Reionization (EoR). However, bright foreground emission presents a significant impediment to its unbiased recovery from interferom
Externí odkaz:
http://arxiv.org/abs/1907.02608