Browsing Institutt for teoretisk astrofysikk by Author "Zaroubi, Saleem"

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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 ...
  • Detecting the neutral IGM in filaments with the SKA 
    Kooistra, Robin; Silva, Marta Bruno; Zaroubi, Saleem; Verheijen, Marc A. W.; Tempel, Elmo; Hess, Kelly M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The intergalactic medium (IGM) plays an important role in the formation and evolution of galaxies. Recent developments in upcoming radio telescopes are starting to open up the possibility of making a first direct detection ...
  • 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 ...