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Extreme particle acceleration in the microquasar Cygnus X-3.

M Tavani¹, A Bulgarelli, G Piano

¹INAF-IASF Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy. pi.agile@iasf-roma.inaf.it

|November 26, 2009

Summary

Astronomers detected high-energy gamma-ray flares from the microquasar Cygnus X-3, providing evidence for particle acceleration in these systems. This finding helps explain the mechanism behind energetic jet formation in microquasars.

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Area of Science:

Astrophysics
High-energy astrophysics
X-ray astronomy

Background:

Microquasars, galactic binary systems, produce relativistic jets and radio flares.
Evidence for gigaelectronvolt particle acceleration in microquasars has been scarce, leaving jet energization mechanisms unclear.

Purpose of the Study:

To investigate gamma-ray emission from the microquasar Cygnus X-3.
To explore the relationship between gamma-ray flares, spectral states, and jet ejections in microquasars.

Main Methods:

Observation of gamma-ray flares above 100 MeV from Cygnus X-3.
Analysis of temporal correlations between gamma-ray flares and radio/X-ray emission states.

Main Results:

Four gamma-ray flares were detected from Cygnus X-3.
Temporal correlations were found between gamma-ray flares and transitional spectral states.
Particle acceleration preceded radio-jet ejections in two instances, indicating energetic particle production during jet formation.

Conclusions:

Microquasars can accelerate particles to very high energies, thousands of times higher than during quiescent states.
The study provides systematic evidence for gigaelectronvolt particle acceleration in microquasars.
Jet formation in microquasars is linked to the production of highly energetic particles.