Browsing Institutt for teoretisk astrofysikk by Author "Offringa, A. R."

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  • Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations 
    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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    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 ...
  • Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR 
    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 (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    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 ...