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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 04202naa a2200673 4500 | |
| 001 | oai:DiVA.org:su-181739 | |
| 003 | SwePub | |
| 008 | 200529s2020 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1817392 URI |
| 024 | 7 | a https://doi.org/10.1093/mnras/staa3272 DOI |
| 040 | a (SwePub)su | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Mertens, F. G.4 aut |
| 245 | 1 0 | a Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z approximate to 9.1 from LOFAR |
| 264 | c 2020-02-05 | |
| 264 | 1 | b Oxford University Press (OUP),c 2020 |
| 338 | a print2 rdacarrier | |
| 520 | a A new upper limit on the 21 cm signal power spectrum at a redshift of z approximate to 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-sigma upper limit of Delta(2)(21) < (73)(2) mK(2) at k = 0.075 h cMpc(-1) is found, an improvement by a factor approximate to 8 in power compared to the previously reported upper limit. The remaining excess power could be due to residual foreground emission from sources or diffuse emission far away from the phase centre, polarization leakage, chromatic calibration errors, ionosphere, or low-level radiofrequency interference. We discuss future improvements to the signal processing chain that can further reduce or even eliminate these causes of excess power. | |
| 650 | 7 | a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng |
| 653 | a methods: data analysis | |
| 653 | a techniques: interferometric | |
| 653 | a dark ages | |
| 653 | a reionization | |
| 653 | a first stars | |
| 653 | a cosmology: observations | |
| 700 | 1 | a Mevius, M.4 aut |
| 700 | 1 | a Koopmans, L. V. E.4 aut |
| 700 | 1 | a Offringa, A. R.4 aut |
| 700 | 1 | a Mellema, Garreltu Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),he Open University of Israel, Israel; Technion, Israel4 aut0 (Swepub:su)gmell |
| 700 | 1 | a Zaroubi, S.4 aut |
| 700 | 1 | a Brentjens, M. A.4 aut |
| 700 | 1 | a Gan, H.4 aut |
| 700 | 1 | a Gehlot, B. K.4 aut |
| 700 | 1 | a Pandey, V. N.4 aut |
| 700 | 1 | a Sardarabadi, A. M.4 aut |
| 700 | 1 | a Vedantham, H. K.4 aut |
| 700 | 1 | a Yatawatta, S.4 aut |
| 700 | 1 | a Asad, K. M. B.4 aut |
| 700 | 1 | a Ciardi, B.4 aut |
| 700 | 1 | a Chapman, E.4 aut |
| 700 | 1 | a Gazagnes, S.4 aut |
| 700 | 1 | a Ghara, Raghunathu Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),he Open University of Israel, Israel; Technion, Israel4 aut0 (Swepub:su)gragh |
| 700 | 1 | a Ghosh, A.4 aut |
| 700 | 1 | a Giri, Sambit Kumaru Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)sgiri |
| 700 | 1 | a Iliev, I. T.4 aut |
| 700 | 1 | a Jelic, V4 aut |
| 700 | 1 | a Kooistra, R.4 aut |
| 700 | 1 | a Mondal, R.4 aut |
| 700 | 1 | a Schaye, J.4 aut |
| 700 | 1 | a Silva, M. B.4 aut |
| 710 | 2 | a Stockholms universitetb Institutionen för astronomi4 org |
| 773 | 0 | t Monthly notices of the Royal Astronomical Societyd : Oxford University Press (OUP)g 493:2, s. 1662-1685q 493:2<1662-1685x 0035-8711x 1365-2966 |
| 856 | 4 | u https://www.duo.uio.no/bitstream/10852/79326/1/staa327.pdf |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-181739 |
| 856 | 4 8 | u https://doi.org/10.1093/mnras/staa327 |
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