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Showing 1–4 of 4 results
Advanced filters: Author: Sandro Mereghetti Clear advanced filters

  • We report observations of GRB 231115A, positionally coincident with the starburst galaxy M82, that unambiguously qualify this burst as a giant flare from a magnetar, which is a rare explosive event releasing gamma rays.

    • Sandro Mereghetti
    • Michela Rigoselli
    • Pietro Ubertini
    Research
    Nature
    Volume: 629, P: 58-61

  • The X-ray spectrum of the soft-γ-ray repeater SGR 0418+5729 is found to exhibit an absorption line, the properties of which depend strongly on the star’s rotational phase; this line is interpreted as a proton cyclotron feature and its energy implies a magnetic field ranging from 2 × 1014 gauss to more than 1015 gauss.

    • Andrea Tiengo
    • Paolo Esposito
    • Giovanni F. Bignami
    Research
    Nature
    Volume: 500, P: 312-314

  • Diffuse X-ray emission is detected around an ultraluminous X-ray source, interpreted as a wind-powered expanding nebula. Its energetics suggests that a super-Eddington regime can be longer than the spin-up time of the central neutron star.

    • Andrea Belfiore
    • Paolo Esposito
    • Luca Zampieri
    Research
    Nature Astronomy
    Volume: 4, P: 147-152