SIMBAD references

2020ApJ...904L..19B - Astrophys. J., 904, L19-L19 (2020/December-1)

Chandra observations of the newly discovered magnetar Swift J1818.0-1607.


Abstract (from CDS):

Swift J1818.0-1607 is a new radio-loud magnetar discovered by the Swift Burst Alert Telescope on 2020 March 12. It has a magnetic field B ∼ 2.5 x 1014 G, spin-down luminosity {dot}E ∼ 7.2 x 1035 erg s–1, and characteristic age τc ∼ 470 yr. Here we report on the Chandra observations of Swift J1818.0-1607, which allowed for a high-resolution imaging and spectroscopic study of the magnetar and its environment. The 1-10 keV spectrum of the magnetar is best described by a single blackbody model with a temperature of 1.2 ± 0.1 keV and an unabsorbed flux of 1.9–0.3+0.4 x 10–11 erg cm–2 s–1. This implies an X-ray luminosity of 9.6–1.5+2.0x1034 d6.52 erg s–1 and efficiency of LX/{dot}E ∼ 0.13 d6.52 at a distance of 6.5 kpc. The Chandra image also shows faint diffuse emission out to ≥ 10′′ from the magnetar, with its spectrum adequately described by a power law with a photon index of 2.0 ± 0.5 and a luminosity of ∼8.1 x 1033 d6.52 erg s–1. The extended emission is likely dominated by a dust-scattering halo and future observations of the source in quiescence will reveal any underlying compact wind nebula. We conclude that Swift J1818.0-1607 is a transient source showing properties between high-B pulsars and magnetars, and could be powered at least partly by its high spin-down, similar to rotation-powered pulsars.

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

Journal keyword(s): High energy astrophysics

Simbad objects: 6

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