The Multi-wavelength Characteristics of the TeV Binary LS I +61${}^{\circ }$ 303

Abstract

We study the characteristics of the TeV binary LS I +61${}^{\circ }$ 303 in radio, soft X-ray, hard X-ray, and gamma-ray (GeV and TeV) energies. The long term variability characteristics are examined as a function of the phase of the binary period of 26.496 days as well as the phase of the super orbital period of 1626 days, dividing the observations into a matrix of 10$\times$10 phases of these two periods. It is found that the long term variability can be described by a sine function of the super orbital period, with the phase and amplitude systematically varying with the binary period phase. We also find a definite wavelength dependent change in this variability description. To understand the radiation mechanism, we define three states in the orbital/ super orbital phase matrix and examine the wide band spectral energy distribution. The derived source parameters indicate that the emission geometry is dominated by a jet structure showing a systematic variation with the orbital/ super orbital period. We suggest that LS I +61${}^{\circ }$ 303 is likely to be a micro-quasar with a steady jet.

10 pages, 7 figures, accepted for publication in ApJ

References in corpus (11)

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• Fermi Large Area Telescope Bright Gamma-ray Source List
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• Origin of the long-term modulation of radio emission of LS I +61 303
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Cited by in corpus (7)

• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
• GeV detection of HESS J0632+057
• Optical spectroscopy of Be/gamma-ray binaries
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
• 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