SIMBAD references

2020ApJ...902....1H - Astrophys. J., 902, 1-1 (2020/October-2)

NICER observation of the temporal and spectral evolution of Swift J1818.0-1607 a missing link between magnetars and rotation-powered pulsars.

HU C.-P., BEGICARSLAN B., GUVER T., ENOTO T., YOUNES G., SAKAMOTO T., RAY P.S., STROHMAYER T.E., GUILLOT S., ARZOUMANIAN Z., PALMER D.M., GENDREAU K.C., MALACARIA C., WADIASINGH Z., JAISAWAL G.K. and MAJID W.A.

Abstract (from CDS):

We report on the hard X-ray burst and the first ∼100 days of NICER monitoring of the soft X-ray temporal and spectral evolution of the newly discovered magnetar Swift J1818.0-1607. The burst properties are typical of magnetars with a duration of T90 = 10 ± 4 ms and a temperature of kT = 8.4 ± 0.7 keV. The 2-8 keV pulse shows a broad, single-peak profile with a pulse fraction increasing with time from 30% to 43%. The NICER observations reveal strong timing noise with {dot}νvarying erratically by a factor of 10, with an average long-term spin-down rate of {dot}ν=(-2.48±0.03)×10–11 s–2, implying an equatorial surface magnetic field of 2.5 x 1014 G and a young characteristic age of ∼470 yr. We detect a large spin-up glitch at MJD 58928.56 followed by a candidate spin-down glitch at MJD 58934.81, with no accompanying flux enhancements. The persistent soft X-ray spectrum of Swift J1818.0-1607 can be modeled as an absorbed blackbody with a temperature of ∼1 keV. Its flux decayed by ∼60% while the modeled emitting area decreased by ∼30% over the NICER observing campaign. This decrease, coupled with the increase in the pulse fraction, points to a shrinking hot spot on the neutron star surface. Assuming a distance of 6.5 kpc, we measure a peak X-ray luminosity of 1.9 x 1035 erg s–1, lower than its spin-down luminosity of 7.2 x 1035 erg s–1. Its quiescent thermal luminosity is <=1.7 x 1034 erg s–1, lower than those of canonical young magnetars. We conclude that Swift J1818.0-1607 is an important link between regular magnetars and high-magnetic-field, rotation-powered pulsars.

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

Journal keyword(s): Pulsars - Neutron stars - Magnetars - X-ray stars

Simbad objects: 19

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2021.03.01-08:21:07

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