Galaxy
Narrow-line Seyfert 1
An unusually variable young Seyfert.
Seyfert 1 galaxies with relatively narrow permitted lines and strong soft X-ray emission, thought to host low-mass, rapidly accreting black holes.
Overview
Seyfert 1 galaxies with relatively narrow permitted lines and strong soft X-ray emission, thought to host low-mass, rapidly accreting black holes.
See also
Quasar
A blindingly bright young galactic nucleus.
BL Lacertae Object
A featureless, variable blazar.
OVV Quasar
An Optically Violent Variable quasar.
Lyman-alpha Emitter
A young galaxy glowing in Lyman-alpha light.
Triangulum Galaxy (M33)
Third-largest galaxy in our Local Group.
Whirlpool Galaxy (M51)
A textbook spiral, mid-merger with a companion.