SIMBAD references

2017ApJS..231....8E - Astrophys. J., Suppl. Ser., 231, 8-8 (2017/July-0)

Magnetar broadband X-ray spectra correlated with magnetic fields: Suzaku archive of SGRs and AXPs Combined with NuSTAR, Swift, and RXTE.

ENOTO T., SHIBATA S., KITAGUCHI T., SUWA Y., UCHIDE T., NISHIOKA H., KISAKA S., NAKANO T., MURAKAMI H. and MAKISHIMA K.

Abstract (from CDS):

The 1-70 keV persistent spectra of 15 magnetars, observed with Suzaku from 2006 to 2013, were studied as a complete sample. Combined with early NuSTAR observations of four hard X-ray emitters, nine objects showed a hard power-law emission dominating at 10 keV with the 15-60 keV flux of ∼1-11×10–11 erg s–1 cm–2. The hard X-ray luminosity Lh, relative to that of a soft-thermal surface radiation Ls, tends to become higher toward younger and strongly magnetized objects. Their hardness ratio, updated from a previous study and defined as ξ=Lh/Ls, is correlated with the measured spin-down rate {dot}P as ξ=0.62×({dot}P/10–11ss–1)0.72, corresponding to positive and negative correlations with the dipole field strength Bd (ξ∝Bd1.41) and the characteristic age τc (ξ∝τc–0.68), respectively. Among our sample, five transients were observed during X-ray outbursts, and the results are compared with their long-term 1-10 keV flux decays monitored with Swift/XRT and RXTE/PCA. Fading curves of three bright outbursts are approximated by an empirical formula used in the seismology, showing a ∼10-40 day plateau phase. Transients show the maximum luminosities of Ls ∼ 1035 erg s–1, which are comparable to those of persistently bright ones, and fade back to <=1032 erg s–1. Spectral properties are discussed in the framework of the magnetar hypothesis.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): catalogs - pulsars: general - stars: magnetars - stars: magnetic field - stars: neutron - X-rays: stars - X-rays: stars

Simbad objects: 37

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2019.09.23-21:03:21

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