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Published April 10, 2016 | Submitted + Published
Journal Article Open

The Structure of the Strongly Lensed Gamma-ray Source B2 0218+35

Abstract

Strong gravitational lensing is a powerful tool for resolving the high-energy universe. We combine the temporal resolution of Fermi-LAT, the angular resolution of radio telescopes, and the independently and precisely known Hubble constant from the analysis by the Planck collaboration, to resolve the spatial origin of gamma-ray flares in the strongly lensed source B2 0218+35. The lensing model achieves 1 mas spatial resolution of the source at gamma-ray energies. The data imply that the gamma-ray flaring sites are separate from the radio core: the bright gamma-ray flare (MJD: 56160-56280) occurred 51 ± 8 pc from the 15 GHz radio core, toward the central engine. This displacement is significant at the ~ 3σ level, and is limited primarily by the precision of the Hubble constant. B2 0218+35 is the first source where the position of the gamma-ray emitting region relative to the radio core can be resolved. We discuss the potential of an ensemble of strongly lensed high-energy sources for elucidating the physics of distant variable sources based on data from Chandra and SKA.

Additional Information

© 2016 The American Astronomical Society. Received 2015 November 13; accepted 2016 February 16; published 2016 April 11. We thank Scott Kenyon and Dan Schwartz for valuable comments. We thank the referee for providing valuable comments. AB is supported by NASA through Einstein Postdoctoral Fellowship. MJG is supported by the Smithsonian Institution.

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Published - apj_821_1_58.pdf

Submitted - 1511.02891v2.pdf

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August 22, 2023
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