SIMBAD references

2014ApJ...785L..19L - Astrophys. J., 785, L19 (2014/April-2)

Spectral analysis in Orbital/Superorbital phase space and hints of superorbital variability in the hard x-rays of LS I +61°303.

LI J., TORRES D.F. and ZHANG S.

Abstract (from CDS):

We present an INTEGRAL spectral analysis in the orbital/superorbital phase space of LS I +61°303. A hard X-ray spectrum with no cutoff is observed at all orbital/superorbital phases. The hard X-ray index is found to be uncorrelated with the radio index (non-simultaneously) measured at the same orbital and superorbital phases. In particular, the absence of an X-ray spectrum softening during periods of negative radio index does not favor a simple interpretation of the radio index variations in terms of a microquasar's changes of state. We uncover hints of superorbital variability in the hard X-ray flux, in phase with the superorbital modulation in soft X-rays. An orbital phase drift of the radio peak flux and index along the superorbital period is observed in the radio data. We explore its influence on a previously reported double-peak structure of a radio orbital light curve, and present it as a plausible explanation.

Abstract Copyright:

Journal keyword(s): methods: observational - X-rays: binaries - X-rays: individual: LS I +61°303

Simbad objects: 7

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2021.02.26-16:33:54

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