NGC 6814 is an
intermediate spiral galaxy in constellation
Aquila. It is located at a distance of about 75 million
light years from Earth, which, given its apparent dimensions, means that NGC 6814 is about 85,000 light years across. NGC 6814 has an extremely bright nucleus and is a type 1.5
Seyfert galaxy. The galaxy is also a highly variable source of X-ray radiation. The ultraviolet and optical emission also varies, although more smoothly, with time lag of two days. The cause of the lag and the smoothing of
light curves is considered to be the reprocessing of the X-rays in the
accretion disk.[3] The cause of the
active galactic nucleus is suspected to be a
supermassive black hole with a mass about 18 million times that of the Sun.[4]
Many regions of ionised gas are studded along the dusty spiral arms.[5]
^Troyer, Jon; Starkey, David; Cackett, Edward M.; Bentz, Misty C.; Goad, Michael R.; Horne, Keith; Seals, James E. (14 January 2016). "Correlated X-ray/ultraviolet/optical variability in NGC 6814". Monthly Notices of the Royal Astronomical Society. 456 (4): 4040–4050.
arXiv:1509.01124.
Bibcode:
2016MNRAS.456.4040T.
doi:
10.1093/mnras/stv2862.