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Título: | A very young radio-loud magnetar |
Autor: | Esposito, Paolo; Rea, Nanda CSIC ORCID; Borghese, Alice CSIC ORCID; Coti Zelati, Francesco CSIC ORCID ; Viganò, Daniele CSIC ORCID; Israel, Gian Luca; Tiengo, Andrea; Ridolfi, A.; Possenti, A.; Burgay, M.; Götz, Diego; Pintore, Fabio; Stella, Luigi; Dehman, Clara CSIC ORCID; Ronchi, M. CSIC ORCID; Campana, Sergio; García García, Alberto CSIC ORCID; Graber, Vanessa CSIC ORCID; Mereghetti, S.; Perna, Rosalba; Rodríguez Castillo, G. A.; Turolla, Roberto; Zane, Silvia | Fecha de publicación: | 2020 | Editor: | IOP Publishing | Citación: | Astrophysical Journal Letters 896(2): L30 (2020) | Resumen: | 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 (${N}_{{\rm{H}}}$ = (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 ${\dot{E}}_{\mathrm{rot}}\sim 1.4\times {10}^{36}$ erg s−1, and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity <5.5 × 1033 erg s−1, lower than the value expected from magnetar cooling models at the source characteristic age. A 1 hr radio observation with the Sardinia Radio Telescope taken about 1 week after the X-ray burst detected a number of strong and short radio pulses at 1.5 GHz, in addition to regular pulsed emission; they were emitted at an average rate 0.9 min−1 and accounted for ~50% of the total pulsed radio fluence. We conclude that Swift J1818.0–1607 is a peculiar magnetar belonging to the small, diverse group of young neutron stars with properties straddling those of rotationally and magnetically powered pulsars. Future observations will make a better estimation of the age possible by measuring the spin-down rate in quiescence. | Descripción: | arXiv:2004.04083v2 | Versión del editor: | https://doi.org/10.3847/2041-8213/ab9742 | URI: | http://hdl.handle.net/10261/236718 | DOI: | 10.3847/2041-8213/ab9742 | E-ISSN: | 2041-8213 |
Aparece en las colecciones: | (ICE) Artículos |
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