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

Andrea Tiengo (), Paolo Esposito, Sandro Mereghetti, Roberto Turolla, Luciano Nobili, Fabio Gastaldello, Diego Götz, Gian Luca Israel, Nanda Rea, Luigi Stella, Silvia Zane and Giovanni F. Bignami
Additional contact information
Andrea Tiengo: Istituto Universitario di Studi Superiori, piazza della Vittoria 15, 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
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

Nature, 2013, vol. 500, issue 7462, 312-314

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.

Date: 2013
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DOI: 10.1038/nature12386

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