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Comptes Rendus Physique
Volume 16, n° 6-7
pages 661-673 (août 2015)
Doi : 10.1016/j.crhy.2015.08.014
Gamma-ray emission from binaries in context
Emission gamma des systèmes binaires
 

Guillaume Dubus a, b,
a Université Grenoble Alpes, IPAG, 38000 Grenoble, France 
b CNRS, IPAG, 38000 Grenoble, France 

Correspondence to: Université Grenoble Alpes, IPAG, 38000 Grenoble, France.Université Grenoble AlpesIPAGGrenoble38000France
Abstract

More than a dozen binary systems are now established as sources of variable, high-energy (HE,  ) gamma rays. Five are also established sources of very-high-energy (VHE,  ) gamma rays. The mechanisms behind gamma-ray emission in binaries are very diverse. My current understanding is that they divide up into four types of systems: gamma-ray binaries, powered by pulsar rotation; microquasars, powered by accretion onto a black hole or neutron star; novae, powered by thermonuclear runaway on a white dwarf; colliding wind binaries, powered by stellar winds from massive stars. Some of these types had long been suspected to emit gamma rays (microquasars), others have taken the community by surprise (novae). My purpose here is to provide a brief review of the current status of gamma-ray emission from binaries, in the context of related objects where similar mechanisms are at work (pulsar wind nebulae, active galactic nuclei, supernova remnants).

The full text of this article is available in PDF format.
Résumé

Plus d'une douzaine de systèmes binaires sont maintenant identifiés comme des sources variables de rayonnement gamma de haute énergie ( ). Cinq systèmes binaires sont également des sources de rayonnement gamma de très haute énergie ( ). Les processus menant à l'émission de ce rayonnement sont variés. On peut néanmoins diviser ces systèmes en quatre grandes classes : les binaires gamma, dont le moteur est la rotation d'un pulsar ; les microquasars, dont le moteur est l'accrétion sur un trou noir ou une étoile à neutrons ; les novae, dont l'énergie provient de la combustion nucléaire à la surface d'une naine blanche ; les binaires à collision de vents, qui dissipent l'énergie cinétique de vents d'étoiles massives. On soupçonnait depuis longtemps que certaines classes de systèmes binaires devaient être associées à de l'émission gamma (les microquasars) ; pour d'autres classes, la découverte d'émission gamma a été une surprise (les novae). Je propose ici une brève revue de nos connaissances sur l'émission gamma de haute et très haute énergie dans les systèmes binaires, avec le souci de souligner les liens avec d'autres objets astrophysiques dans lesquels des processus similaires sont à l'oeuvre (nébuleuses de pulsar, noyaux actifs de galaxie, restes de supernova).

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Keywords : Acceleration of particles, Radiation mechanisms: non-thermal, Binaries: general, Gamma-rays: stars

Mots-clés : Accélération de particules, Mécanismes de rayonnement non thermiques, Étoiles binaires, Rayonnement gamma : étoiles


1  Public+List+of+LAT-Detected+Gamma-Ray+Pulsars.
2  The magnetic field intensity ( ) is set by the ratio of synchrotron to Compton fluxes [[53]]. The gamma-ray spectrum fails to reproduce the hard H.E.S.S. spectrum, mostly because it is calculated in the isotropic approximation whereas it should take into account that the incoming photons from the star come from a specific direction as well as relativistic effects [[79]]. The slope of the synchrotron emission fits well with the X-ray to MeV spectrum, but note that this is not self-consistent since very strong cooling is expected at the high-energy end.


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