A very young radio-loud magnetar

P. Esposito; N. Rea; A. Borghese; F. Coti Zelati; D. Viganò; G. L. Israel; A. Tiengo; A. Ridolfi; A. Possenti; M. Burgay; D. Götz; F. Pintore; L. Stella; C. Dehman; M. Ronchi; S. Campana; A. Garcia-Garcia; V. Graber; S. Mereghetti; R. Perna; G. A. Rodríguez Castillo; R. Turolla; S. Zane

doi:10.3847/2041-8213/ab9742

A very young radio-loud magnetar

P. Esposito, N. Rea, A. Borghese, F. Coti Zelati, D. Viganò, G. L. Israel, A. Tiengo, A. Ridolfi, A. Possenti, M. Burgay, D. Götz, F. Pintore, L. Stella, C. Dehman, M. Ronchi, S. Campana, A. Garcia-Garcia, V. Graber, S. Mereghetti, R. PernaG. A. Rodríguez Castillo, R. Turolla, S. Zane

Department of Physics

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Abstract

The magnetar Swift J1818.0-1607 was discovered in March 2020 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 $L_{\rm burst} \sim2\times 10^{39}$ erg/s (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 ($N_{\rm H} = (1.13\pm0.03) \times 10^{23}$ cm$^{-2}$ and $kT = 1.16\pm0.03$ keV) plus a power-law ($\Gamma=0.0\pm1.3$) in the 1-20 keV band, with a luminosity of $\sim$$8\times10^{34}$ erg/s, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field $B \sim 7\times10^{14}$ G, spin-down luminosity $\dot{E}_{\rm rot} \sim 1.4\times10^{36}$ erg/s and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity $

Original language	English
Number of pages	8
Journal	Astrophysical Journal Letters
Volume	896
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ab9742
Publication status	Published - 17 Jun 2020

Keywords

astro-ph.HE

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10.3847/2041-8213/ab9742

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Esposito, P., Rea, N., Borghese, A., Zelati, F. C., 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., ... Zane, S. (2020). A very young radio-loud magnetar. Astrophysical Journal Letters , 896(2). https://doi.org/10.3847/2041-8213/ab9742

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title = "A very young radio-loud magnetar",

abstract = "The magnetar Swift J1818.0-1607 was discovered in March 2020 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 $L_{\rm burst} \sim2\times 10^{39}$ erg/s (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 ($N_{\rm H} = (1.13\pm0.03) \times 10^{23}$ cm$^{-2}$ and $kT = 1.16\pm0.03$ keV) plus a power-law ($\Gamma=0.0\pm1.3$) in the 1-20 keV band, with a luminosity of $\sim$$8\times10^{34}$ erg/s, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field $B \sim 7\times10^{14}$ G, spin-down luminosity $\dot{E}_{\rm rot} \sim 1.4\times10^{36}$ erg/s and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity $",

keywords = "astro-ph.HE",

author = "P. Esposito and N. Rea and A. Borghese and Zelati, {F. Coti} and D. Vigan{\`o} and Israel, {G. L.} and A. Tiengo and A. Ridolfi and A. Possenti and M. Burgay and D. G{\"o}tz and F. Pintore and L. Stella and C. Dehman and M. Ronchi and S. Campana and A. Garcia-Garcia and V. Graber and S. Mereghetti and R. Perna and Castillo, {G. A. Rodr{\'i}guez} and R. Turolla and S. Zane",

note = "10 pages, 4 figures, 1 table; revised version accepted for publication in The Astrophysical Journal Letters",

year = "2020",

month = jun,

day = "17",

doi = "10.3847/2041-8213/ab9742",

language = "English",

volume = "896",

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Esposito, P, Rea, N, Borghese, A, Zelati, FC, Viganò, D, Israel, GL, 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, GAR, Turolla, R & Zane, S 2020, 'A very young radio-loud magnetar', Astrophysical Journal Letters , vol. 896, no. 2. https://doi.org/10.3847/2041-8213/ab9742

TY - JOUR

T1 - A very young radio-loud magnetar

AU - Esposito, P.

AU - Rea, N.

AU - Borghese, A.

AU - Zelati, F. Coti

AU - Viganò, D.

AU - Israel, G. L.

AU - Tiengo, A.

AU - Ridolfi, A.

AU - Possenti, A.

AU - Burgay, M.

AU - Götz, D.

AU - Pintore, F.

AU - Stella, L.

AU - Dehman, C.

AU - Ronchi, M.

AU - Campana, S.

AU - Garcia-Garcia, A.

AU - Graber, V.

AU - Mereghetti, S.

AU - Perna, R.

AU - Castillo, G. A. Rodríguez

AU - Turolla, R.

AU - Zane, S.

N1 - 10 pages, 4 figures, 1 table; revised version accepted for publication in The Astrophysical Journal Letters

PY - 2020/6/17

Y1 - 2020/6/17

N2 - The magnetar Swift J1818.0-1607 was discovered in March 2020 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 $L_{\rm burst} \sim2\times 10^{39}$ erg/s (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 ($N_{\rm H} = (1.13\pm0.03) \times 10^{23}$ cm$^{-2}$ and $kT = 1.16\pm0.03$ keV) plus a power-law ($\Gamma=0.0\pm1.3$) in the 1-20 keV band, with a luminosity of $\sim$$8\times10^{34}$ erg/s, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field $B \sim 7\times10^{14}$ G, spin-down luminosity $\dot{E}_{\rm rot} \sim 1.4\times10^{36}$ erg/s and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity $

AB - The magnetar Swift J1818.0-1607 was discovered in March 2020 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 $L_{\rm burst} \sim2\times 10^{39}$ erg/s (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 ($N_{\rm H} = (1.13\pm0.03) \times 10^{23}$ cm$^{-2}$ and $kT = 1.16\pm0.03$ keV) plus a power-law ($\Gamma=0.0\pm1.3$) in the 1-20 keV band, with a luminosity of $\sim$$8\times10^{34}$ erg/s, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field $B \sim 7\times10^{14}$ G, spin-down luminosity $\dot{E}_{\rm rot} \sim 1.4\times10^{36}$ erg/s and characteristic age of 240 yr, the shortest currently known. Archival observations led to an upper limit on the quiescent luminosity $

KW - astro-ph.HE

U2 - 10.3847/2041-8213/ab9742

DO - 10.3847/2041-8213/ab9742

M3 - Article

SN - 2041-8205

VL - 896

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

ER -