Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433

Abstract

SS433 is a Galactic microquasar with powerful jets, where very-high-energy particles are produced. We study particle acceleration in the jets of SS433 in the light of the recent multi-wavelength data from radio to TeV gamma ray. We first present a general framework for the particle acceleration, cooling, and transport in relativistic jets. We then apply this to two X-ray knots in the jets of SS433, focusing on leptonic emission. Our detailed treatment of particle transport and evolution produces substantially different predictions from previous papers. For both regions, our model can account for the multi-wavelength data except for the GeV data. This suggests that GeV emission is mostly from different regions and/or mechanisms. We find that the acceleration process should be efficient, which could be realized by diffusive shock acceleration close to the Bohm limit. Provided that protons are accelerated at the same efficiency as electrons, our results imply that SS433 is a PeVatron, i.e., can accelerate protons beyond a PeV. Future hard X-ray and MeV gamma-ray observations can critically test our models by detecting the spectral turnover or cutoff.

Main text 11 pages, 3 figures. To appear in ApJ

References in corpus (23)

• The NumPy array: a structure for efficient numerical computation
• The Nature of SS433 and the Ultraluminous X-ray Sources
• A radiation transfer model for the Milky-Way: I. Radiation fields and application to High Energy Astrophysics
• High-Energy Gamma Rays from the Milky Way: Three-Dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar Medium
• The proton low-mass microquasar: high-energy emission
• The Distance to SS433/W50 and its Interaction with the ISM
• Spectroscopic Observations of the Mass Donor Star in SS 433
• Jet contributions to the broad-band spectrum of Cyg X-1 in the hard state
• Production of gamma rays and neutrinos in the dark jets of the microquasar SS433
• Cosmic ray diffusion near the Bohm limit in the Cassiopeia A supernova remnant
• On the interaction of microquasar jets with stellar winds
• Leptonic secondary emission in a hadronic microquasar model
• Cosmic Ray Acceleration by Relativistic Shocks: Limits and Estimates
• Non thermal emission from microquasar/ISM interaction
• Detection of persistent gamma-ray emission toward SS433/W50
• Jets of SS433 on scales of dozens parsecs
• Mass ratio in SS433 revisited
• Time-Dependent Synchrotron and Compton Spectra from Jets of Microquasars
• Gamma-rays from SS433: evidence for periodicity
• NuSTAR observations of the supernova remnant RX J1713.7$-$3946
• On the possibilities of high-energy neutrino production in the jets of microquasar SS433 in light of new observational data
• Tentative evidence of spatially extended GeV emission from SS433/W50
• Electron transport with re-acceleration and radiation in the jets of X-ray binaries

Cited by in corpus (6)

• Continuous Jets and Backflow Models for the Formation of W50/SS433 in Magnetohydrodynamics Simulations
• Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
• Spatially resolved study of the SS 433/W50 west region with Chandra: X-ray structure and spectral variation of non-thermal emission
• Energy estimation of high energy particles associated with the SS433/W50 system through radio observation at 1.4 GHz
• Physical properties of the molecular cloud, N4, in SS433; Evidence for an interaction of molecular cloud with the jet from SS433
• Hard X-ray emission from the eastern jet of SS 433 powering the W50 `Manatee' nebula: Evidence for particle re-acceleration