Monitoring radio galaxies at TeV energies with HAWC
  With an instantaneous field of view of 2 sr and a duty cycle > 95%, the High
Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is a perfect instrument
for monitoring variable TeV sources. Because radio galaxies are a type of
Active Galactic Nuclei (AGN) with their jets misaligned with respect to our
line of sight, they may help us to probe the physics of very-high-energy (VHE)
emission processes in these objects. Three out of four radio galaxies that have
been detected at TeV energies by other facilities are located within the field
of view of the HAWC Observatory: M87, NGC 1275, and 3C 264. A search for TeV
gamma rays at their locations yields no statistically significant excess of
counts. We present corresponding upper limits for each radio galaxy and light
curves covering 3 years of data taken with HAWC.
