Light Curve and SED Modeling of the Gamma-Ray Binary 1FGL J1018.6–5856: Constraints on the Orbital Geometry and Relativistic Flow

An, Hongjun

doi:10.3847/1538-4357/AA6623

Title: Light Curve and SED Modeling of the Gamma-Ray Binary 1FGL J1018.6–5856: Constraints on the Orbital Geometry and Relativistic Flow

Journal Article · Sat Apr 01 00:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA6623· OSTI ID:22661184

An, Hongjun

We present broadband spectral energy distributions and light curves of the gamma-ray binary 1FGL J1018.6−5856 measured in the X-ray and the gamma-ray bands. We find that the orbital modulation in the low-energy gamma-ray band is similar to that in the X-ray band, suggesting a common spectral component. However, above a GeV the orbital light curve changes significantly. We suggest that the GeV band contains significant flux from a pulsar magnetosphere, while the X-ray to TeV light curves are dominated by synchrotron and Compton emission from an intrabinary shock (IBS). We find that a simple one-zone model is inadequate to explain the IBS emission, but that beamed Synchrotron-self Compton radiation from adiabatically accelerated plasma in the shocked pulsar wind can reproduce the complex multiband light curves, including the variable X-ray spike coincident with the gamma-ray maximum. The model requires an inclination of ∼50° and an orbital eccentricity of ∼0.35, consistent with the limited constraints from existing optical observations. This picture motivates searches for pulsations from the energetic young pulsar powering the wind shock.

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OSTI ID:: 22661184

Journal Information:: Astrophysical Journal, Vol. 838, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Overview of non-transient γ -ray binaries and prospects for the Cherenkov Telescope Array Chernyakova, M.; Malyshev, D.; Paizis, A. Astronomy & Astrophysics, Vol. 631 https://doi.org/10.1051/0004-6361/201936501	journal	November 2019
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Signatures of Intra-binary Shock Emission in the Black Widow Pulsar Binary PSR J2241−5236 An, Hongjun; Romani, Roger W.; Kerr, Matthew The Astrophysical Journal, Vol. 868, Issue 1 https://doi.org/10.3847/2041-8213/aaedaf	journal	November 2018
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Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array Chernyakova, M.; Malyshev, D.; Paizis, A. arXiv https://doi.org/10.48550/arxiv.1909.11018	text	January 2019

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Title: Light Curve and SED Modeling of the Gamma-Ray Binary 1FGL J1018.6–5856: Constraints on the Orbital Geometry and Relativistic Flow

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