PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAI - Gamma Ray Indirect
Very High Energy Gamma-ray Emission from the Binary System LS I +61 303
D. Kieda*, A. C. B., A. A., B. W., B. A., B. J. H., C. M., C. J. L., C. A. J., E. M., F. A., F. K. A., F. Q., F. G. M., F. L., F. A., G. A., G. G. H., G. C., G. O., H. D., H. O., H. J., H. B., H. T. B., J. W., K. P., K. M., K. T. K., K. S., L. M. J., L. M., M. G., M. C. E., M. P., M. R., N. D., N.R. M., O.B. S., O. R. A., O. A. N., P. S. R., P. S., P. K., P. M., P. R. R., P. E., Q. J., R. K., R. P. T., R. D., R. E., R. J. L., S. I., S. M., S. G. H., S. R., T. D., V. V. V., W. A., W. D. A. and W. T. J.et al. (click to show)
Full text: pdf
Pre-published on: July 08, 2021
Published on: March 18, 2022
LS I +61$^{\circ}$ 303 is one of around ten gamma-ray binaries detected so far which has a spectral energy
distribution dominated by MeV-GeV photons. It is located at a distance of 2 kpc and consists of a
compact object (black hole or neutron star) in an eccentric orbit around a 10-15 $M_{\odot}$ Be star, with
an orbital period of 26.496 days. The binary orbit modulates the emission ranging from radio to
TeV energies. A second, longer, modulation period of 1667 days (the super-orbital period) has also
been detected from radio to TeV observations. The VERITAS imaging atmospheric Cherenkov
telescope array has been observing LS I +61$^{\circ}$ 303 since 2006, and has accumulated a dataset that
fully covers the entire orbit. Increased coverage of the source in the very-high-energy band is
currently underway to provide more results on the modulation pattern, super-orbital period, and
orbit-to-orbit variability at the highest energies. The spectral measurements at the highest energies
will reveal more information about gamma-ray production/absorption mechanisms, the nature of
the compact object, and the particle acceleration mechanism. Using $ >$150 hrs of VERITAS data,
we present a detailed study of the spectral energy distribution and periodic behavior of this rare
gamma-ray source type at very-high energy.
DOI: https://doi.org/10.22323/1.395.0832
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