The efficient low-mass Seyfert MCG–05–23–016

Abstract

Aims. The Seyfert 1.9 galaxy MCG–05–23–016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high Eddington rate, and allows us to study a super massive black hole in an early stage.