A Precessing Jet Scenario for the Multi-Wavelength Long-Term Modulation of LS I +61${}^{\circ }$303

Abstract

The high-mass X-ray binary LS I +61${}^{\circ }$303 is detected across the electromagnetic spectrum from radio until the very high energy gamma-ray regime. The emission is not only highly variable on many time scales, but is also periodic at all observed wavelengths. Periodic modulation was observed on different time-scales, ranging from hours, over months to several years. The subject of this article is a super-orbital, long-term modulation of ~4.6 years. We review the observation of this periodic modulation at multiple wavelengths and investigate systematic relationships between them. In particular, radio observations reveal that the long-term modulation is a very stable feature of the source. Observations at other wavelengths result in a phase-shift of the modulation pattern that is a systematic function of energy. The stability of this period favors a scenario in which the long-term modulation is the result of a precessing jet giving rise to periodic changes in the Doppler factor, beating with the orbital modulation of the accretion rate. We explain the phase-shifts across energy bands in a scenario with shorter wavelengths originating closer to the base of the presessing jet. A significant deviation of the TeV emission from this trend possibly requires a different explanation related to magnetic reconnection events.

16 pages, 3 figures

References in corpus (16)

• Gamma-ray binaries: pulsars in disguise ?
• Global optical/infrared - X-ray correlations in X-ray binaries: quantifying disc and jet contributions
• Blazar flares powered by plasmoids in relativistic reconnection
• Accretion vs colliding wind models for the gamma-ray binary LS I +61 303: an assessment
• A Magnetohydrodynamic Model for the Formation of Episodic Jets
• VLBA images of the precessing jet of LSI+61303
• Sizing up the population of gamma-ray binaries
• Long-term periodicity in LSI+61303 as beat frequency between orbital and precessional rate
• An anti-correlation between X-ray luminosity and H-alpha equivalent width in X-ray binaries
• New insight into the origin of the GeV flare in the binary system PSR B1259-63 from the 2017 periastron passage
• Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303
• Discovery of a periodical apoastron GeV peak in LS I +61°303
• Revisiting LS I +61 303 with VLBI astrometry
• Radio QPO in the $\gamma$-ray-loud X-ray binary LS I +61${}^{\circ }$303
• Understanding the periodicities in radio and GeV emission from LS I+61303
• Radio/X-ray correlations and variability in the X-ray binary LS I +61°303

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• A precessing stellar disk model for superorbital modulations of the gamma-ray binary LS I+61${}^{\circ }$ 303
• Polarization study of gamma-ray binary
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