Abstract
Gamma-ray emitting binaries (GREBs) are complex systems. Its study became in the last years a major endeavour for the high-energy astrophysics community, both from an observational and a theoretical perspective. Whereas the accumulation of observation time for most Galactic gamma-ray sources is typically leading to highly accurate descriptions of their steady phenomenology, GREBs keep providing “exceptions to the rule” either through long-term monitoring of known systems or in the discovery of new sources of this class. Moreover, many GREBs have been identified as powerful radio, optical and X-ray emitters, and may significantly contribute as well to the Galactic cosmic-ray sea. Their understanding implies, therefore, solving a puzzle in a broad-band and multi-messenger context. In these proceedings we will summarise our current understanding of GREBs, emphasising the most relevant observational results and reviewing a number of controversial properties.
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Notes
Phase-resolved spectroscopy can provide more extreme values for \(\Gamma _{\gamma }\), e.g. in LS 5039 \(\Gamma _{\gamma } = 1.8\) when the compact object is in its inferior conjunction, whereas \(\Gamma _{\gamma }\) = 3.1 during superior conjunction. Note that an exponential cutoff power law model best fits LS 5039 during its inferior conjunction.
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This paper is the peer-reviewed version of a contribution selected among those presented at the Conference on Gamma-Ray Astrophysics with the AGILE Satellite held at Accademia Nazionale dei Lincei and Agenzia Spaziale Italiana, Rome on December 11–13, 2017. TC: A decade of AGILE.
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Paredes, J.M., Bordas, P. Phenomenology of gamma-ray emitting binaries. Rend. Fis. Acc. Lincei 30 (Suppl 1), 107–113 (2019). https://doi.org/10.1007/s12210-019-00769-w
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DOI: https://doi.org/10.1007/s12210-019-00769-w