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Variation of the X-ray non-thermal emission in the Arches cloud

M. Clavel 1, 2 S. Soldi 1 R. Terrier 1 V. Tatischeff 3 G. Maurin 4 G. Ponti A. Goldwurm 1, 2 A. Decourchelle 2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The origin of the iron fluorescent line at 6.4 keV from an extended region surrounding the Arches cluster is debated and the non-variability of this emission up to 2009 has favoured the low-energy cosmic ray origin over a possible irradiation by hard X-rays. By probing the variability of the Arches cloud non-thermal emission in the most recent years, including a deep observation in 2012, we intend to discriminate between the two competing scenarios. We perform a spectral fit of XMM-Newton observations collected from 2000 to 2013 in order to build the Arches cloud light curve corresponding to both the neutral Fe Kα line and the X-ray continuum emissions. We reveal a 30 per cent flux drop in 2012, detected with more than 4σ significance for both components. This implies that a large fraction of the studied non-thermal emission is due to the reflection of an X-ray transient source.
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Submitted on : Thursday, September 25, 2014 - 12:14:17 PM
Last modification on : Tuesday, December 15, 2020 - 11:10:02 PM

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M. Clavel, S. Soldi, R. Terrier, V. Tatischeff, G. Maurin, et al.. Variation of the X-ray non-thermal emission in the Arches cloud. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2014, 443, pp.L129-L133. ⟨10.1093/MNRASL/SLU100⟩. ⟨in2p3-01068260⟩



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