SIMBAD references

2020ApJ...896L..30E - Astrophys. J., 896, L30-L30 (2020/June-3)

A very young radio-loud magnetar.

ESPOSITO P., REA N., BORGHESE A., ZELATI F.C., VIGANO D., ISRAEL G.L., TIENGO A., RIDOLFI A., POSSENTI A., BURGAY M., GOTZ D., PINTORE F., STELLA L., DEHMAN C., RONCHI M., CAMPANA S., GARCIA-GARCIA A., GRABER V., MEREGHETTI S., PERNA R., RODRIGUEZ CASTILLO G.A., TUROLLA R. and ZANE S.

Abstract (from CDS):

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 x 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 (NH = (1.13 ± 0.03) x 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 x 1034 erg s–1, dominated by the blackbody emission. From our timing analysis, we derive a dipolar magnetic field B ∼ 7 x 1014 G, spin-down luminosity {dot}Erot∼1.4×1036 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 x 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.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Magnetars - Neutron stars - Transient sources - X-ray bursts - Radio pulsars

Simbad objects: 6

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2021.03.03-09:52:56

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