Jets can also be fired out from the black hole region at nearly the speed of light. The vastly improved spectral resolution and collecting area provided by these satellites is revolutionizing our understanding of the X-ray emitting regions around the black hole. It is likely that Narrow-Line Seyfert 1s have extreme values of a primary physical parameter such as mass accretion rate onto the black hole. These AGN may be a small but distinct subclass which show broad optical line emission from an accretion disk.
Tests are underway to determine if the double-peaked emission lines indeed arise in a disk.
Major outflows of ionized gas from quasars can be studied via X-ray and ultraviolet observations of Broad and Narrow Absorption Line Quasars. Seyfert 2 galaxies have their black hole regions hidden from direct sight by obscuring gas thought to be in the form of a torus.