Statistical analysis of the causes of excess variance in the 21 cm signal power spectra obtained with the Low-Frequency Array

Autor: H. Gan, L. V. E. Koopmans, F. G. Mertens, M. Mevius, A. R. Offringa, B. Ciardi, B. K. Gehlot, R. Ghara, A. Ghosh, S. K. Giri, I. T. Iliev, G. Mellema, V. N. Pandey, S. Zaroubi

Publikováno v: Astronomy & astrophysics, 663:A9. EDP Sciences

The detection of the 21 cm signal of neutral hydrogen from the Epoch of Reionization (EoR) is challenging due to bright foreground sources, radio frequency interference (RFI), the ionosphere, and instrumental effects. Even after correcting for these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41b959928daa0bbd6514b05a9e6a307d
https://research.rug.nl/en/publications/3a5301c1-ae18-4980-bf63-21b9249e641b

Comparing Foreground Removal Techniques for Recovery of the LOFAR-EoR 21cm Power Spectrum

Autor: Jonathan R. Pritchard, Vibor Jelić, Emma Chapman, Saleem Zaroubi, Abhik Ghosh, I. T. Iliev, Sambit K. Giri, B. Ciardi, Florent Mertens, Luitje Koopmans, Ian Hothi, Raghunath Ghara, B. K. Gehlot

Publikováno v: Monthly Notices of the Royal Astronomical Society
Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2020, 500 (2), pp.2264-2277. ⟨10.1093/mnras/staa3446⟩
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2020, 500 (2), pp.2264-2277. ⟨10.1093/mnras/staa3446⟩
Monthly Notices of the Royal Astronomical Society, 500, 2264-2277. Oxford University Press

We compare various foreground removal techniques that are being utilised to remove bright foregrounds in various experiments aiming to detect the redshifted 21cm signal of neutral hydrogen from the Epoch of Reionization. In this work, we test the per

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a7e05b0100472bbc387479bd63a8691
http://arxiv.org/abs/2011.01284

Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR

Autor: K. M. B. Asad, Florent Mertens, A. R. Offringa, B. K. Gehlot, Luitje Koopmans, I. T. Iliev, Maaijke Mevius, Sambit K. Giri, Sarod Yatawatta, B. Ciardi, Abhik Ghosh, Rajesh Mondal, Vishambhar Pandey, Michiel A. Brentjens, A. M. Sardarabadi, H. Gan, Raghunath Ghara, R. Kooistra, Simon Gazagnes, Joop Schaye, Vibor Jelić, Harish Vedantham, Garrelt Mellema, Saleem Zaroubi, M. B. Silva, Emma Chapman

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 493(2), 1662-1685

A new upper limit on the 21 cm signal power spectrum at a redshift of z ≈ 9.1 is presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The analysis includes significant improvements in spectrally smooth gain-calibration,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac4e4eb4cafd3c7d4919e8c1933d868d
http://fulir.irb.hr/5324/1/staa327.pdf

High-performance P3M N-body code: CUBEP3M

Autor: Ue-Li Pen, Vincent Desjacques, Hugh Merz, J. D. Emberson, I. T. Iliev, Joachim Harnois-Déraps

Publikováno v: Monthly Notices of the Royal Astronomical Society, Vol. 436, No 1 (2013) pp. 540-559

This paper presents CUBEP3M, a publicly-available high performance cosmological N-body code and describes many utilities and extensions that have been added to the standard package. These include a memory-light runtime SO halo finder, a non-Gaussian

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dab42e1e7c4000170b8bc7264b541e58
https://archive-ouverte.unige.ch/unige:35137