Abstract
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research topic in astrophysics, owing to the fact that many questions remain open on the physical mechanisms of jet launching, of particle acceleration in the jet, and on the radiative processes. In this work I focus on the last item, and present a review of the current understanding of radiative emission processes in supermassive-black-hole jets.
Highlights
The radio non-thermal emission is associated with a pair of relativistic jets of plasma which are launched along the polar axis of the supermassive black hole (SMBH) and perpendicularly to the accretion disk
The spectral energy distribution (SED) 2 of blazars is characterized by a non-thermal continuum extending from radio to very-high-energy γ-rays, with only subdominant thermal emission in optical/UV associated with the accretion disk and emission lines from the BLR
Until now we focused on the synchrotron emission by a stationary distribution of electrons in the jet, comparing theoretical expectations with blazar SEDs, that can be seen as snapshots of the blazar emission at a given instant
Summary
AGNs. The radio non-thermal emission is associated with a pair of relativistic jets of plasma which are launched along the polar axis of the SMBH and perpendicularly to the accretion disk. The radio non-thermal emission is associated with a pair of relativistic jets of plasma which are launched along the polar axis of the SMBH and perpendicularly to the accretion disk These jets can travel up to the Mpc scale, exceeding the (visible) size of the AGN host galaxy. Galaxies 2020, 8, 72 emission [18,19], making these AGNs luminous in the Universe These radio-loud AGNs observed down-the-jet are called blazars [20], and are characterized by high luminosity, rapid variability, and high degree of polarization [21]. It is remarkable that in γ-rays, where the radio-quiet AGNs do not emit anymore, around 70% of all the known extragalactic sources are blazars [22]
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