Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303

Abstract

We report the discovery of a systematic constant time lag between the X-ray and radio flares of the gamma-ray binary LSI +61 303, persistent over long, multi-year, time scale. Using the data of monitoring of the system by RXTE we show that the orbital phase of X-ray flares from the source varies from ${\varphi }_X\simeq 0.35$ to ${\varphi }_X\simeq 0.75$ on the superorbital 4.6 yr time scale. Simultaneous radio observations show that periodic radio flares always lag the X-ray flare by $\Delta {\varphi }_{X-R}\simeq 0.2$. We propose that the constant phase lag corresponds to the time of flight of the high-energy particle filled plasma blobs from inside the binary to the radio emission region at the distance ~10 times the binary separation distance. We put forward a hypothesis that the X-ray bursts correspond to the moments of formation of plasma blobs inside the binary system.

References in corpus (19)

• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303
• The INTEGRAL Science Data Centre (ISDC)
• Discovery of High-Energy Gamma-Ray Emission from the Binary System PSR B1259-63/LS 2883 Around Periastron with Fermi
• The variable radio emission from GRS 1915+105
• VERITAS Observations of the gamma-Ray Binary LS I +61 303
• Fermi LAT Observations of LS I +61 303: First detection of an orbital modulation in GeV Gamma Rays
• The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039
• Hints for a fast precessing relativistic radio jet in LS I +61 303
• INTEGRAL and XMM-Newton observations of LSI +61 303
• Simultaneous X-ray and Radio Monitoring of the Unusual Binary LSI+61 303: Measurements of the Lightcurve and High-Energy Spectrum
• A compact pulsar wind nebula model of the gamma-ray loud binary LS I +61 303
• Long Term X-ray Monitoring Of The TeV Binary LS I +61 303 with RXTE
• Unveiling the super-orbital modulation of LS I +61 303 in X-rays
• Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
• Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303
• Long-term monitoring of LS I+61303 with INTEGRAL
• H-alpha Emission Variability in the gamma-ray Binary LS I +61 303

Cited by in corpus (25)

• Gamma-ray binaries and related systems
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• Multi-wavelength Observations of the Binary System PSR B1259-63/LS~2883 around the 2014 Periastron Passage
• Multi-wavelength observations of the binary system PSR B1259-63/LS 2883 around the 2010-2011 periastron passage
• Long-term TeV and X-ray Observations of the Gamma-ray Binary HESS J0632+057
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
• Modelling Jets, Tori and Flares in Pulsar Wind Nebulae
• Super-orbital variability of LS I +61°303 at TeV energies
• Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
• GeV detection of HESS J0632+057
• H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
• Study of orbital and superorbital variability of LSI +61 303 with X-ray data
• Orbital variability of the optical linear polarization of the $\gamma$-ray binary LS I +61 303 and new constraints on the orbital parameters
• Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303
• Spectral analysis in orbital/superorbital phase space and hints of superorbital variability in the hard X-rays of LS I +61 303
• Evidence for periodic accretion-ejection in LSI+61303
• Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
• The Multi-wavelength Characteristics of the TeV Binary LS I +61${}^{\circ }$ 303
• Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
• Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
• A precessing stellar disk model for superorbital modulations of the gamma-ray binary LS I+61${}^{\circ }$ 303
• Owens Valley Radio Observatory monitoring of LS I +61°303 completes three cycles of the super-orbital modulation
• Achromatic rapid flares in hard X-rays in the $\gamma$-ray binary LS I +61-303
• Spectral lags of flaring events in $LSI+61^o$ 303 from RXTE Observations