dc.date.accessioned | 2020-09-10T18:02:58Z | |
dc.date.available | 2020-09-10T18:02:58Z | |
dc.date.created | 2020-09-04T15:24:43Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Ghara, Raghunath Giri, Sambit Kumar Mellema, Garrelt Ciardi, Benedetta Zaroubi, Saleem Iliev, Ilian T. Koopmans, Leon V. E. Chapman, Emma Gazagnes, S. Gehlot, Bharat Kumar Ghosh, Abhik Jelić, Vibor Mertens, Florent G. Mondal, Rajesh Schaye, Joop Silva, Marta Bruno Asad, Khan M. B. Kooistra, Robin Mevius, M. Offringa, A. R. Pandey, V. N. Yatawatta, Sarod . Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations. Monthly notices of the Royal Astronomical Society. 2020, 493(4), 4728-4747 | |
dc.identifier.uri | http://hdl.handle.net/10852/79325 | |
dc.description.abstract | We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift ≈ 9.1 using new upper limits on the 21-cm power spectrum measured by the LOFAR radio telescope and a prior on the ionized fraction at that redshift estimated from recent cosmic microwave background (CMB) observations. We have used results from the reionization simulation code grizzly and a Bayesian inference framework to constrain the parameters which describe the physical state of the IGM. We find that, if the gas heating remains negligible, an IGM with ionized fraction ≳0.13 and a distribution of the ionized regions with a characteristic size ≳ 8 h−1 comoving megaparsec (Mpc) and a full width at half-maximum (FWHM) ≳16 h−1 Mpc is ruled out. For an IGM with a uniform spin temperature TS ≳ 3 K, no constraints on the ionized component can be computed. If the large-scale fluctuations of the signal are driven by spin temperature fluctuations, an IGM with a volume fraction ≲0.34 of heated regions with a temperature larger than CMB, average gas temperature 7–160 K, and a distribution of the heated regions with characteristic size 3.5–70 h−1 Mpc and FWHM of ≲110 h−1 Mpc is ruled out. These constraints are within the 95 per cent credible intervals. With more stringent future upper limits from LOFAR at multiple redshifts, the constraints will become tighter and will exclude an increasingly large region of the parameter space. | |
dc.language | EN | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations | |
dc.type | Journal article | |
dc.creator.author | Ghara, Raghunath | |
dc.creator.author | Giri, Sambit Kumar | |
dc.creator.author | Mellema, Garrelt | |
dc.creator.author | Ciardi, Benedetta | |
dc.creator.author | Zaroubi, Saleem | |
dc.creator.author | Iliev, Ilian T. | |
dc.creator.author | Koopmans, Leon V. E. | |
dc.creator.author | Chapman, Emma | |
dc.creator.author | Gazagnes, S. | |
dc.creator.author | Gehlot, Bharat Kumar | |
dc.creator.author | Ghosh, Abhik | |
dc.creator.author | Jelić, Vibor | |
dc.creator.author | Mertens, Florent G. | |
dc.creator.author | Mondal, Rajesh | |
dc.creator.author | Schaye, Joop | |
dc.creator.author | Silva, Marta Bruno | |
dc.creator.author | Asad, Khan M. B. | |
dc.creator.author | Kooistra, Robin | |
dc.creator.author | Mevius, M. | |
dc.creator.author | Offringa, A. R. | |
dc.creator.author | Pandey, V. N. | |
dc.creator.author | Yatawatta, Sarod | |
cristin.unitcode | 185,15,3,0 | |
cristin.unitname | Institutt for teoretisk astrofysikk | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |
dc.identifier.cristin | 1827460 | |
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=4728&rft.date=2020 | |
dc.identifier.jtitle | Monthly notices of the Royal Astronomical Society | |
dc.identifier.volume | 493 | |
dc.identifier.issue | 4 | |
dc.identifier.startpage | 4728 | |
dc.identifier.endpage | 4747 | |
dc.identifier.doi | https://doi.org/10.1093/mnras/staa487 | |
dc.identifier.urn | URN:NBN:no-82434 | |
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/10852/79325/2/staa487.pdf | |
dc.type.version | PublishedVersion | |