Theoretical overview on high-energy emission in microquasars

Abstract

Microquasar (MQ) jets are sites of particle acceleration and synchrotron emission. Such synchrotron radiation has been detected coming from jet regions of different spatial scales, which for the instruments at work nowadays appear as compact radio cores, slightly resolved radio jets, or (very) extended structures. Because of the presence of relativistic particles and dense photon, magnetic and matter fields, these outflows are also the best candidates to generate the very high-energy (VHE) gamma-rays detected coming from two of these objects, LS 5039 and LS I +61 303, and may be contributing significantly to the X-rays emitted from the MQ core. In addition, beside electromagnetic radiation, jets at different scales are producing some amount of leptonic and hadronic cosmic rays (CR), and evidences of neutrino production in these objects may be eventually found. In this work, we review on the different physical processes that may be at work in or related to MQ jets. The jet regions capable to produce significant amounts of emission at different wavelengths have been reduced to the jet base, the jet at scales of the order of the size of the system orbital semi-major axis, the jet middle scales (the resolved radio jets), and the jet termination point. The surroundings of the jet could be sites of multiwavelegnth emission as well, deserving also an insight. We focus on those scenarios, either hadronic or leptonic, in which it seems more plausible to generate both photons from radio to VHE and high-energy neutrinos. We briefly comment as well on the relevance of MQ as possible contributors to the galactic CR in the GeV-PeV range.

Astrophysics & Space Science, in press (invited talk in the conference: The multimessenger approach to the high-energy gamma-ray sources", Barcelona/Catalonia, in July 4-7); 10 pages, 6 figures, 2 tables (one reference corrected)

References in corpus (6)

• Orbital X-Ray Variability of the Microquasar LS 5039
• Confirmation of persistent radio jets in the microquasar LS 5039
• XMM-Newton observation of a spectral state transition in the peculiar radio/X-ray/gamma-ray source LS I +61 303
• LS I +61 303 as a potential neutrino source on the light of MAGIC results
• Inverse Compton e-p pair cascade model for the gamma-ray production in massive binary LSI +61^o 303
• Constraints on the Geometry of the VHE Emission in LS 5039 from Photon-Photon Deabsorption

Cited by in corpus (8)

• Understanding the Very High-Energy Emission from Microquasars
• The proton low-mass microquasar: high-energy emission
• Leptonic secondary emission in a hadronic microquasar model
• On the nature of the AGILE galactic transient sources
• Investigation of the broadband emission of the gamma-ray binary HESS J0632+057 using an intrabinary shock model
• Synthetic Neutrino Imaging of a Microquasar
• Multimessenger Emission from Very-High-Energy Black Hole-Jet Systems in the Milky Way
• Simulated Radio and Neutrino Imaging of a Microquasar