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

Understanding the HERA Phase i receiver system with simulations and its impact on the detectability of the EoR delay power spectrum

Autor: Fagnoni, N, De Lera Acedo, E, Deboer, DR, Abdurashidova, Z, Aguirre, JE, Alexander, P, Ali, ZS, Balfour, Y, Beardsley, AP, Bernardi, G, Billings, TS, Bowman, JD, Bradley, RF, Bull, P, Burba, J, Carilli, CL, Cheng, C, Dexter, M, Dillon, JS, Ewall-Wice, A, Fritz, R, Furlanetto, SR, Gale-Sides, K, Glendenning, B, Gorthi, D, Greig, B, Grobbelaar, J, Halday, Z, Hazelton, BJ, Hewitt, JN, Hickish, J, Jacobs, DC, Josaitis, A, Julius, A, Kern, NS, Kerrigan, J, Kim, H, Kittiwisit, P, Kohn, SA, Kolopanis, M, Lanman, A, Plante, PL, Lekalake, T, Liu, A, Macmahon, D, Malan, L, Malgas, C, Maree, M, Martinot, ZE, Matsetela, E, Mena Parra, J, Mesinger, A, Molewa, M, Morales, MF, Mosiane, T, Neben, AR, Nikolic, B, Parsons, AR, Patra, N, Pieterse, S, Pober, JC, Razavi-Ghods, N, Robnett, J, Rosie, K, Sims, P, Smith, C, Syce, A, Thyagarajan, N, Williams, PKG, Zheng, H

Publikováno v: Monthly Notices of the Royal Astronomical Society, vol 500, iss 1

The detection of the Epoch of Reionization (EoR) delay power spectrum using a "foreground avoidance method" highly depends on the instrument chromaticity. The systematic effects induced by the radio-telescope spread the foreground signal in the delay

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0297ce0909920b1afa8a5835ca900cb9

Mapmaking for precision 21 cm cosmology MAPMAKING for PRECISION 21 CM COSMOLOGY JOSHUA S. DILLON et al

Autor: Dillon, JS, Tegmark, M, Liu, A, Ewall-Wice, A, Hewitt, JN, Morales, MF, Neben, AR, Parsons, AR, Zheng, H

Publikováno v: Physical Review D-Particles, Fields, Gravitation and Cosmology, vol 91, iss 2
Dillon, JS; Tegmark, M; Liu, A; Ewall-Wice, A; Hewitt, JN; Morales, MF; et al.(2015). Mapmaking for precision 21 cm cosmology MAPMAKING for PRECISION 21 CM COSMOLOGY JOSHUA S. DILLON et al.. Physical Review D-Particles, Fields, Gravitation and Cosmology, 91(2). doi: 10.1103/PhysRevD.91.023002. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/5184g6hm

© 2015 American Physical Society. In order to study the "Cosmic Dawn" and the Epoch of Reionization with 21 cm tomography, we need to statistically separate the cosmological signal from foregrounds known to be orders of magnitude brighter. Over the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::624b4cbc0db269bc0ae9ac1c2f1bd07f
https://escholarship.org/uc/item/5184g6hm

The distribution of dark mass in galaxies

Autor: Sackett, PD, Kochanek, CS, Hewitt, JN

Publikováno v: ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING, 165-174
STARTPAGE=165;ENDPAGE=174;TITLE=ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING

Gravitational lensing is one of a number of methods used to probe the distribution of dark mass in the Universe. On galactic scales, complementary techniques include the use of stellar kinematics, the kinematics and morphology of the neutral gas laye

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=narcis______::3c7eb9b6e49d33f44cd5e8555524871b
https://research.rug.nl/en/publications/04be16f3-1729-4b63-a436-c1d4e8f2145e

The gravitational lens candidate HE 1104-1805 and the size of absorption systems

Autor: Smette, A, Robertson, JG, Shaver, PA, Reimers, D, Wisotzki, L, Kohler, T, Kochanek, CS, Hewitt, JN

Publikováno v: ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING, 101-102
STARTPAGE=101;ENDPAGE=102;TITLE=ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING

We obtained 1.2 Angstrom resolution spectra over the range 3175 - 7575 Angstrom for the two components of the gravitational lens candidate HE 1104-1805 (z = 2.31, m(B) = 16.7 and 18.6, separation = 3.0 arcsec; cf. Wisotzki et al. 1993), with the aim

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=narcis______::d24de32be7e89c355c10a90099e7d48e
https://research.rug.nl/en/publications/d867e00d-9338-46e4-82a9-ff888682064a