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A variable absorption feature in the X-ray spectrum of a magnetar

Author

Listed:
  • Andrea Tiengo

    (Istituto Universitario di Studi Superiori, piazza della Vittoria 15, I-27100 Pavia, Italy
    Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, INAF, via E. Bassini 15, I-20133 Milano, Italy
    Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, via A. Bassi 6, I-27100 Pavia, Italy)

  • Paolo Esposito

    (Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, INAF, via E. Bassini 15, I-20133 Milano, Italy)

  • Sandro Mereghetti

    (Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, INAF, via E. Bassini 15, I-20133 Milano, Italy)

  • Roberto Turolla

    (Università di Padova, via F. Marzolo 8, I-35131 Padova, Italy
    Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK)

  • Luciano Nobili

    (Università di Padova, via F. Marzolo 8, I-35131 Padova, Italy)

  • Fabio Gastaldello

    (Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, INAF, via E. Bassini 15, I-20133 Milano, Italy)

  • Diego Götz

    (AIM CEA/Irfu/Service d’Astrophysique, Orme des Merisiers, F-91191 Gif-sur-Yvette, France)

  • Gian Luca Israel

    (Osservatorio Astronomico di Roma, INAF, via Frascati 33, I-00040 Monteporzio Catone, Italy)

  • Nanda Rea

    (Institut de Ciències de l’Espai (IEEC–CSIC), Campus UAB, Torre C5, 2a planta, E-08193 Barcelona, Spain)

  • Luigi Stella

    (Osservatorio Astronomico di Roma, INAF, via Frascati 33, I-00040 Monteporzio Catone, Italy)

  • Silvia Zane

    (Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK)

  • Giovanni F. Bignami

    (Istituto Universitario di Studi Superiori, piazza della Vittoria 15, I-27100 Pavia, Italy
    Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, INAF, via E. Bassini 15, I-20133 Milano, Italy)

Abstract

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.

Suggested Citation

  • Andrea Tiengo & Paolo Esposito & Sandro Mereghetti & Roberto Turolla & Luciano Nobili & Fabio Gastaldello & Diego Götz & Gian Luca Israel & Nanda Rea & Luigi Stella & Silvia Zane & Giovanni F. Bignami, 2013. "A variable absorption feature in the X-ray spectrum of a magnetar," Nature, Nature, vol. 500(7462), pages 312-314, August.
    • Handle: RePEc:nat:nature:v:500:y:2013:i:7462:d:10.1038_nature12386
    DOI: 10.1038/nature12386
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