SIMBAD references

2021MNRAS.505L.106M - Mon. Not. R. Astron. Soc., 505, L106-L111 (2021/July-3)

Evidence for Fe Kα line and soft X-ray lag in NGC 7456 ultraluminous X-ray source-1.


Abstract (from CDS):

We report the first detection of an Fe Kα line and soft X-ray lag in the ultraluminous X-ray (ULX) source NGC 7456 ULX-1. The XMM-Newton spectra show the presence of the 6.4 keV Fe line at 2.6σ confidence and an upper limit on the FWHM of 32900 km s–1. Assuming that the line arises by reflection from a Keplerian disk, it must originate beyond 85rg from the compact object. As a result of Fourier timing analysis, we found that the soft X-ray photons lag behind the hard X-ray photons with a ∼1300 s delay. The covariance spectra indicate that the hard spectral component is responsible for the correlated variability and the soft X-ray lag. This is the second ULX in which an Fe Kα line is found, the fifth with a soft X-ray lag, and the first with both features detected.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): X-rays: binaries - X-rays: individual: NGC 7456 ULX-1

Simbad objects: 11

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