  We present six case studies from a broad mass range ($1 - 10^9$ $M_\odot$) of
astrophysical objects, each of which exhibit signs of jets and emit intense
high energy gamma rays ($>10$ GeV). Many of these objects also emit spatially
identifiable ultra high energy cosmic rays (UHECRs). In all cases it is found
that wakefield acceleration (WFA) explains both the global properties and
details. For blazars, we also explain the temporal structure of these signals,
which includes neutrinos, and the correlations in their "bursts" and
anti-correlation in flux and index. Blazars ($\sim 10^9$ $M_\odot$), radio
galaxies ($\sim 10^8\, M_{\odot}$), Seyfert galaxies ($\sim 10^6 \,M_{\odot}$),
starburst galaxies ($\sim 10^{3}\, M_{\odot}$), down to microquasars ($1 \sim
10$ $M_\odot$) interestingly exhibit the same physics since the nature of the
accretion and acceleration is independent of the mass, aside from maximum
values. It is possible to accelerate electrons to energies much greater than
$10$ GeV, and protons beyond $10^{20}$ eV with WFA. We compare observational
values with theoretical ones to illustrate they are in good agreement. This
mechanism is also accompanied by related emissions, such as high-energy
pin-pointed neutrinos, time varying radio, optical, and X-ray emissions,
opening an opportunity to characterize these astrophysical objects via
multi-messenger approaches.
