IC 310

[4][5] IC 310 has an active nucleus (AGN) and seems to represent a low-luminosity FRI radio galaxy at the borderline angle which reveals its BL Lac-type central engine.

[9] According to further studies, it is suggested IC 310 is the closest blazar and key object for AGN research, due to the fact, a blazar-like radio jet has been found using parsec-scale VLBL imaging, together with the unusual flat gamma-ray spectrum and variable high-energy emission.

[11] There is a point-like emission in IC 310 according the XMM-Newton observation, without signs of the structure correlated with its radio halo tail.

[13][14] This shocked an impressively bright flare on the variability time scales on minutes[15] reaching up average flux level in the night up to one Crab above 1 TeV with hard spectrum over the past 20 years in energy.

[16] This shows the fast variability that constrains the size of the gamma-ray emission regime, to shrink 20% of the gravitation radius from the black hole challenging shock acceleration models.