Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR
dc.date.accessioned | 2020-09-10T18:04:18Z | |
dc.date.available | 2020-09-10T18:04:18Z | |
dc.date.created | 2020-09-04T14:54:05Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Mertens, Florent G. Mevius, M. Koopmans, Leon V. E. Offringa, A. R. Mellema, Garrelt Zaroubi, Saleem Brentjens, M. A. Gan, H. Gehlot, Bharat Kumar Pandey, V. N. Sardarabadi, A. M. Vedantham, Harish K. Yatawatta, Sarod Asad, Khan M. B. Ciardi, B. Chapman, Emma Gazagnes, S. Ghara, R. Ghosh, Abhik Giri, Sambit Kumar Iliev, Ilian T. Jelić, Vibor Kooistra, Robin Mondal, Rajesh Schaye, Joop Silva, Marta Bruno . Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR. Monthly notices of the Royal Astronomical Society. 2020, 493(2), 1662-1685 | |
dc.identifier.uri | http://hdl.handle.net/10852/79326 | |
dc.description.abstract | 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, Gaussian Process Regression (GPR) foreground mitigation and optimally weighted power spectrum inference. Previously seen ‘excess power’ due to spectral structure in the gain solutions has markedly reduced but some excess power still remains with a spectral correlation distinct from thermal noise. This excess has a spectral coherence scale of 0.25–0.45 MHz and is partially correlated between nights, especially in the foreground wedge region. The correlation is stronger between nights covering similar local sidereal times. A best 2-σ upper limit of Δ221<(73)2mK2 | |
dc.language | EN | |
dc.title | Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR | |
dc.type | Journal article | |
dc.creator.author | Mertens, Florent G. | |
dc.creator.author | Mevius, M. | |
dc.creator.author | Koopmans, Leon V. E. | |
dc.creator.author | Offringa, A. R. | |
dc.creator.author | Mellema, Garrelt | |
dc.creator.author | Zaroubi, Saleem | |
dc.creator.author | Brentjens, M. A. | |
dc.creator.author | Gan, H. | |
dc.creator.author | Gehlot, Bharat Kumar | |
dc.creator.author | Pandey, V. N. | |
dc.creator.author | Sardarabadi, A. M. | |
dc.creator.author | Vedantham, Harish K. | |
dc.creator.author | Yatawatta, Sarod | |
dc.creator.author | Asad, Khan M. B. | |
dc.creator.author | Ciardi, B. | |
dc.creator.author | Chapman, Emma | |
dc.creator.author | Gazagnes, S. | |
dc.creator.author | Ghara, R. | |
dc.creator.author | Ghosh, Abhik | |
dc.creator.author | Giri, Sambit Kumar | |
dc.creator.author | Iliev, Ilian T. | |
dc.creator.author | Jelić, Vibor | |
dc.creator.author | Kooistra, Robin | |
dc.creator.author | Mondal, Rajesh | |
dc.creator.author | Schaye, Joop | |
dc.creator.author | Silva, Marta Bruno | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 1827431 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly notices of the Royal Astronomical Society&rft.volume=493&rft.spage=1662&rft.date=2020 | |
dc.identifier.jtitle | Monthly notices of the Royal Astronomical Society | |
dc.identifier.volume | 493 | |
dc.identifier.issue | 2 | |
dc.identifier.startpage | 1662 | |
dc.identifier.endpage | 1685 | |
dc.identifier.doi | https://doi.org/10.1093/mnras/staa327 | |
dc.identifier.urn | URN:NBN:no-82429 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 0035-8711 | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/79326/1/staa327.pdf | |
dc.type.version | PublishedVersion |
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