High-Energy Phenomena in Microquasar Systems
Summary
Microquasars are stellar-mass analogues of active galactic nuclei, comprising a compact object—either a neutron star or a black hole—accreting matter from a companion star and driving collimated, relativistic outflows. These systems exhibit a wealth of high-energy phenomena across the electromagnetic spectrum, from radio synchrotron knots to very-high-energy gamma-ray emission. Particle acceleration occurs at multiple sites: within the inner jets, at recollimation shocks in the outflowing wind, and where jets interact with the ambient medium to form extended lobes. Magnetic fields play a dual role in collimating the flow and mediating synchrotron and inverse Compton emission. High-resolution X-ray spectroscopy and polarimetry have revealed ordered field structures and non-thermal tails in jet spectra, while ground-based Cherenkov observatories have resolved TeV gamma-ray lobes that testify to electron energies exceeding tens of TeV. Complementary hard X-ray observations probe the accretion disc corona and reflection features, linking disc–jet coupling to the overall energy budget. Together, these multi-wavelength studies illuminate fundamental processes in relativistic outflows, inform models of cosmic-ray production, and offer insight into feedback between compact objects and their environments.
Research from Nature Portfolio
No recent Nature Portfolio content available.
High-Energy Phenomena in Microquasar Systems publication trend
The graph below shows the total number of articles in high-energy phenomena in microquasar systems across all publications each year (not limited to Nature Index journals).
Technical terms
Microquasar: A binary system with a compact object accreting from a companion star and launching relativistic jets, analogous to quasars on stellar scales.
Relativistic jet: A narrow outflow of plasma travelling at velocities approaching the speed of light, often with bulk Lorentz factors above a few.
Synchrotron emission: Radiation produced by charged particles spiralling around magnetic field lines, characterized by a broad, non-thermal spectrum.
Inverse Compton scattering: A process in which relativistic electrons transfer energy to low-energy photons, boosting them to X-ray or gamma-ray energies.
Polarisation degree: The fraction of electromagnetic radiation with a preferred plane of oscillation, used to infer magnetic field geometry.
References
- X-Ray Polarization of the Eastern Lobe of SS 433. The Astrophysical Journal Letters (2024).
- Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC. The Astrophysical Journal (2024).
- A NuSTAR view of SS433. Astronomy & Astrophysics (2023).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.