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The long-term enhanced brightness of the magnetar 1E 1547.0-5408 by Zelati, Francesco Coti; Borghese, Alice; Rea, Nanda; Viganò, Daniele; Enoto, Teruaki; Esposito, Paolo; Pons, José A.; Campana, Sergio; Israel, Gian Luca is a scholarly article available to read on EtoBox.

What is The long-term enhanced brightness of the magnetar 1E 1547.0-5408 about?

We present the evolution of the X-ray emission properties of the magnetar 1E 1547.0-5408 since February 2004 over a time period covering three outbursts. We analyzed new and archival observations taken with the Swift, NuSTAR, Chandra and XMM-Newton X-ray satellites. The source has been observed at a relatively steady soft X-ray flux of $\approx$ 10$^{-11}$ erg cm$^{-2}$ s$^{-1}$ (0.3-10 keV) over the last 9 years, which is about an order of magnitude fainter than the flux at the peak of the last outburst in 2009, but a factor of $\sim$ 30 larger than the level in 2006. The broad-band spectrum extracted from two recent NuSTAR observations in April 2016 and February 2019 showed a faint hard X-ray emission up to $\sim$ 70 keV. Its spectrum is adequately described by a flat power law component, and its flux is $\sim$ $7 \times 10^{-12}$ erg cm$^{-2}$ s$^{-1}$ (10-70 keV), that is a factor of $\sim$ 20 smaller than at the peak of the 2009 outburst. The hard X-ray spectral shape has flattened significantly in time, which is at variance with the overall cooling trend of the soft X-ray component. The pulse profile extracted from these NuSTAR pointings displays variability in shape and ampl

Author

Zelati, Francesco Coti; Borghese, Alice; Rea, Nanda; Viganò, Daniele; Enoto, Teruaki; Esposito, Paolo; Pons, José A.; Campana, Sergio; Israel, Gian Luca

Published

2019

Language

EN