A Very Young Radio-loud Magnetar

A Very Young Radio-loud Magnetar

The magnetar Swift J1818.0-1607 was discovered in 2020 March when Swift detected a 9 ms hard X-ray burst and a long-lived outburst. Prompt X-ray observations revealed a spin period of 1.36 s, soon confirmed by the discovery of radio pulsations. We report here on the analysis of the Swift burst and f...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2020-06, Vol.896 (2), p.L30
Main Authors: Esposito, P., Rea, N., Borghese, A., Zelati, F. Coti, Viganò, D., Israel, G. L., Tiengo, A., Ridolfi, A., Possenti, A., Burgay, M., Götz, D., Pintore, F., Stella, L., Dehman, C., Ronchi, M., Campana, S., Garcia-Garcia, A., Graber, V., Mereghetti, S., Perna, R., Castillo, G. A. Rodríguez, Turolla, R., Zane, S.
Format: Article
Language:eng
Subjects:
Age
Blackbody
Emission analysis
Emissions
Fluence
Gamma rays
Luminosity
Magnetars
Magnetic fields
Magnetic properties
Neutron stars
Pulsars
Radio observation
Radio pulsars
Radio telescopes
Transient sources
X-ray bursts
XMM (spacecraft)
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Summary:The magnetar Swift J1818.0-1607 was discovered in 2020 March when Swift detected a 9 ms hard X-ray burst and a long-lived outburst. Prompt X-ray observations revealed a spin period of 1.36 s, soon confirmed by the discovery of radio pulsations. We report here on the analysis of the Swift burst and follow-up X-ray and radio observations. The burst average luminosity was Lburst ∼ 2 × 1039 erg s−1 (at 4.8 kpc). Simultaneous observations with XMM-Newton and NuSTAR three days after the burst provided a source spectrum well fit by an absorbed blackbody ( = (1.13 0.03) × 1023 cm−2 and kT = 1.16 0.03 keV) plus a power law (Γ = 0.0 1.3) in the 1-20 keV band, with a luminosity of ∼8 × 1034 erg s−1, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field B ∼ 7 × 1014 G, spin-down luminosity erg s−1, and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity
ISSN:2041-8205
2041-8213