Detection of the magnetar SGR J1745−2900 up to 291 GHz with evidence of polarized millimetre emission

Abstract : In 2015, Torne et al. reported detections of the magnetar SGR J1745-2900 up to 225 GHz (1.33 mm), which was the highest radio frequency detection of pulsar emission at that time. In this work, we present the results of new observations of the same magnetar with detections up to 291 GHz (1.03 mm), together with evidence of linear polarization in its millimetre emission. SGR J1745−2900 continues to show variability and is, on average, a factor ∼4 brighter in the millimetre band than in our observations of 2014 July. The new measured spectrum is slightly inverted, with α = +0.4 ± 0.2 (for S ν ∝ ν α). However, the spectrum does not seem to be well described by a single power law, which might be due to the intrinsic variability of the source, or perhaps a turn-up somewhere between 8.35 and 87 GHz. These results may help us to improve our still incomplete model of pulsar emission and, in addition, they further support the search for and study of pulsars located at the Galactic Centre using millimetre wavelengths.
Type de document :
Article dans une revue
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 465 (1), pp.242-247. 〈10.1093/mnras/stw2757〉
Liste complète des métadonnées

Littérature citée [15 références]  Voir  Masquer  Télécharger

https://hal-insu.archives-ouvertes.fr/insu-01520688
Contributeur : Nathalie Pothier <>
Soumis le : mercredi 10 mai 2017 - 17:14:16
Dernière modification le : jeudi 7 février 2019 - 15:58:33
Document(s) archivé(s) le : vendredi 11 août 2017 - 13:23:02

Fichier

stw2757.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

P. Torne, G. Desvignes, R. Eatough, R. Karuppusamy, Gabriel Paubert, et al.. Detection of the magnetar SGR J1745−2900 up to 291 GHz with evidence of polarized millimetre emission. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 465 (1), pp.242-247. 〈10.1093/mnras/stw2757〉. 〈insu-01520688〉

Partager

Métriques

Consultations de la notice

330

Téléchargements de fichiers

129