A Universal Relation between the Gamma-Ray Luminosity and Power of Relativistic Outflows

The relations between the gamma-ray luminosity and power for pulsar wind nebulae and short gamma-ray bursts are studied, respectively. After comparing with those for the previous relativistic outflow systems (including long gamma-ray bursts, active galactic nuclei, and black hole X-ray binaries), our results show that there exists a universal correlation between the gamma-ray luminosity and power, and the radiation efficiency is independent of the gamma-ray luminosity for various relativistic jet systems. Therefore, the acceleration and emission mechanisms or efficiencies may be similar in all relativistic outflows regardless of their central engines.