Direct Optimal Mapping for 21cm Cosmology: A Demonstration with the Hydrogen Epoch of Reionization Array

Autor: Xu, Z, Hewitt, JN, Chen, KF, Kim, H, Dillon, JS, Kern, NS, Morales, MF, Hazelton, BJ, Byrne, R, Fagnoni, N, Acedo, EDL, Abdurashidova, Z, Adams, T, Aguirre, JE, Alexander, P, Ali, ZS, Baartman, R, Balfour, Y, Beardsley, AP, Bernardi, G, Billings, TS, Bowman, JD, Bradley, RF, Bull, P, Burba, J, Carey, S, Carilli, CL, Cheng, C, DeBoer, DR, Dexter, M, Eksteen, N, Ely, J, Ewall-Wice, A, Fritz, R, Furlanetto, Gale-Sides, K, Glendenning, B, Gorthi, D, Greig, B, Grobbelaar, J, Halday, Z, Hickish, J, Jacobs, DC, Julius, A, Kariseb, M, Kerrigan, J, Kittiwisit, P, Kohn, SA, Kolopanis, M, Lanman, A, Plante, PL, Liu, A, Loots, A, Ma, YZ, Edward MacMahon, DH, Malan, L, Malgas, C, Malgas, K, Marero, B, Martinot, ZE, Mesinger, A, Molewa, M, Mosiane, T, Murray, SG, Neben, AR, Nikolic, B, Nuwegeld, H, Parsons, AR, Patra, N, Pieterse, S, Pober, JC, Razavi-Ghods, N, Robnett, J, Rosie, K, Sims, P, Smith, C, Swarts, H, Thyagarajan, N, Wyngaarden, PVV, Williams, PKG, Zheng, H

Motivated by the desire for wide-field images with well-defined statistical properties for 21cm cosmology, we implement an optimal mapping pipeline that computes a maximum likelihood estimator for the sky using the interferometric measurement equatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd583de3cc16623d049411df54ffff96
http://arxiv.org/abs/2204.06021

Forming intracluster gas in a galaxy protocluster at a redshift of 2.16.

Autor: Di Mascolo L; Astronomy Unit, Department of Physics, University of Trieste, Trieste, Italy. luca.dimascolo@units.it.; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy. luca.dimascolo@units.it.; IFPU - Institute for Fundamental Physics of the Universe, Trieste, Italy. luca.dimascolo@units.it., Saro A; Astronomy Unit, Department of Physics, University of Trieste, Trieste, Italy.; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy.; IFPU - Institute for Fundamental Physics of the Universe, Trieste, Italy.; INFN - Sezione di Trieste, Trieste, Italy., Mroczkowski T; European Southern Observatory (ESO), Garching, Germany., Borgani S; Astronomy Unit, Department of Physics, University of Trieste, Trieste, Italy.; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy.; IFPU - Institute for Fundamental Physics of the Universe, Trieste, Italy.; INFN - Sezione di Trieste, Trieste, Italy., Churazov E; Max-Planck-Institut für Astrophysik (MPA), Garching, Germany.; Space Research Institute, Moscow, Russia., Rasia E; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy.; IFPU - Institute for Fundamental Physics of the Universe, Trieste, Italy., Tozzi P; INAF - Osservatorio Astrofisico di Arcetri, Firenze, Italy., Dannerbauer H; Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife, Spain.; Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain., Basu K; Argelander Institute for Astronomy, University of Bonn, Bonn, Germany., Carilli CL; National Radio Astronomy Observatory, Socorro, NM, USA., Ginolfi M; European Southern Observatory (ESO), Garching, Germany.; Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, Italy., Miley G; Leiden Observatory, Leiden University, Leiden, The Netherlands., Nonino M; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy., Pannella M; Astronomy Unit, Department of Physics, University of Trieste, Trieste, Italy.; INAF - Osservatorio Astronomico di Trieste, Trieste, Italy.; IFPU - Institute for Fundamental Physics of the Universe, Trieste, Italy., Pentericci L; INAF - Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy., Rizzo F; Cosmic Dawn Center (DAWN), Copenhagen, Denmark.; Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.

Publikováno v: Nature [Nature] 2023 Mar; Vol. 615 (7954), pp. 809-812. Date of Electronic Publication: 2023 Mar 29.

Foreground modelling via Gaussian process regression: An application to HERA data

Autor: Ghosh, A, Mertens, F, Bernardi, G, Santos, MG, Kern, NS, Carilli, CL, Grobler, TL, Koopmans, LVE, Jacobs, DC, Liu, A, Parsons, AR, Morales, MF, Aguirre, JE, Dillon, JS, Hazelton, BJ, Smirnov, OM, Gehlot, BK, Matika, S, Alexander, P, Ali, ZS, Beardsley, AP, Benefo, RK, Billings, TS, Bowman, JD, Bradley, RF, Cheng, C, Chichura, PM, Deboer, DR, Acedo, EDL, Ewall-Wice, A, Fadana, G, Fagnoni, N, Fortino, AF, Fritz, R, Furlanetto, SR, Gallardo, S, Glendenning, B, Gorthi, D, Greig, B, Grobbelaar, J, Hickish, J, Josaitis, A, Julius, A, Igarashi, AS, Kariseb, M, Kohn, SA, Kolopanis, M, Lekalake, T, Loots, A, MacMahon, D, Malan, L, Malgas, C, Maree, M, Martinot, ZE, Mathison, N, Matsetela, E, Mesinger, A, Neben, AR, Nikolic, B, Nunhokee, CD, Patra, N, Pieterse, S, Razavi-Ghods, N, Ringuette, J, Robnett, J, Rosie, K, Sell, R, Smith, C, Syce, A, Tegmark, M, Thyagarajan, N, Williams, PKG, Zheng, H

Publikováno v: Monthly Notices of the Royal Astronomical Society, vol 495, iss 3

The key challenge in the observation of the redshifted 21-cm signal from cosmic reionization is its separation from the much brighter foreground emission. Such separation relies on the different spectral properties of the two components, although, in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::efff53d71fef6e834d6ce41bd0c6b90d
https://www.repository.cam.ac.uk/handle/1810/305940

H I21-cm Cosmology and the Bispectrum: Closure Diagnostics in Massively Redundant Interferometric Arrays

Autor: Carilli, CL, Nikolic, B, Thyagarajan, N, Gale-Sides, K

Publikováno v: Radio Science, vol 53, iss 6

New massively redundant low frequency arrays allow for a novel investigation of closure relations in interferometry. We employ commissioning data from the Hydrogen Epoch of Reionization Array to investigate closure quantities in this densely packed g

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::070845c23c780f4cbba765f630396ec6
https://escholarship.org/uc/item/7bb0f1fp

Polarized Foreground Power Spectra from the HERA-19 Commissioning Array

Autor: Kohn, S, Chichura, PM, Igarashi, AS, Fortino, AF, Aguirre, JE, Benefo, RK, Billings, TS, Gallardo, S, Plante, PL, Martinot, ZE, Nunhokee, CD, Alexander, P, Ali, ZS, Beardsley, AP, Bernardi, G, Bowman, JD, Bradley, RF, Carilli, CL, Cheng, C, DeBoer, DR, Acedo, EDL, Dillon, JS, Ewall-Wice, A, Fadana, G, Fagnoni, N, Fritz, R, Furlanetto, SR, Glendenning, B, Greig, B, Grobbelaar, J, Hazelton, BJ, Hewitt, JN, Hickish, J, Jacobs, DC, Julius, A, Kariseb, M, Kern, NS, Kolopanis, M, Lekalake, T, Liu, A, Loots, A, MacMahon, D, Malan, L, Malgas, C, Maree, M, Mathison, N, Matsetela, E, Mesinger, A, Morales, MF, Neben, AR, Nikolic, B, Parsons, AR, Patra, N, Pieterse, S, Pober, JC, Razavi-Ghods, N, Ringuette, J, Robnett, J, Rosie, K, Sell, R, Smith, C, Syce, A, Tegmark, M, Thyagarajan, N, Williams, PKG, Zheng, H

Publikováno v: Kohn, S; Chichura, PM; Igarashi, AS; Fortino, AF; Aguirre, JE; Benefo, RK; et al.(2018). Polarized Foreground Power Spectra from the HERA-19 Commissioning Array. UCLA: Retrieved from: http://www.escholarship.org/uc/item/97p2s4hf

Foreground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted HI emission from the Epoch of Reionization (EoR). The inherent spectral smoothness of synchrotron radiation, the dominant foreground

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od_______325::eb0b4a04efd3dfb9c64f735244917db5
http://www.escholarship.org/uc/item/97p2s4hf