Spectral and variability properties of LS 5039 from radio to very high-energy gamma-rays

Details Spectral and variability properties of LS 5039 from radio to very high-energy gamma-rays Spectral and variability properties of LS 5039 from radio to very high-energy gamma-rays

2006-05-19

arxiv.org/abs/astro-ph/0605491v1

Astronomy and Astrophysics

Astrophysics

3 pages, 3 figures, 1 Table. Proceedings of the conference: Relativistic Astrophysics and Cosmology: Einstein's Legacy

Scientific paper

Microquasars are X-ray binaries with relativistic jets. The microquasar LS 5039 turned out to be the first high-energy gamma-ray microquasar candidate due to its likely association with the EGRET source 3EG J1824-1514. Further theoretical studies supported this association, which could be extended to other EGRET sources. Very recently, Aharonian et al. (2005) have communicated the detection of the microquasar LS 5039 at TeV energies. This fact confirms the EGRET source association and leaves no doubt about the gamma-ray emitting nature of this object. The aim of the present work is to show that, applying a cold-matter dominated jet model to LS 5039, we can reproduce many of the spectral and variability features observed in this source. Jet physics is explored, and some physical quantities are estimated as a by-product of the performed modeling. Although at the moment only LS 5039 has been detected on the entire electromagnetic spectrum, it does not seem unlikely that other microquasars will show similar spectral properties. Therefore, an in-depth study of the first gamma-ray microquasar, on theoretical grounds supported by observations, can render a useful knowledge applicable elsewhere.

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