NGC 3198 [SEP] constellation
NGC 3198
NGC 3198, also known as Herschel 146 is a barred spiral galaxy in the constellation Ursa Major. It was discovered by William Parsons, 3rd Earl of Rosse (Lord Rosse), sometime before 1850.
NGC 3198 is located in the Leo Spur, which is part of the Virgo Supercluster, and is approximately 47 million light years away.
Supernovae.
Two supernovae have been discovered in NGC 3198. SN 1966J, a Type Ib supernova, and 1999bw, which was significantly fainter than expected when
Extraplanar gas
Extraplanar gas is cold atomic hydrogen which has been discovered slowly rotating around some spiral galaxies and located well outside their thin disk regions. It was discovered by using radio telescopes to observe the distribution of atomic hydrogen around galaxy disks. Galaxies which have shown evidence of extraplanar gas include NGC 891, NGC 2403, UGC 7321, NGC 4559 and NGC 3198.
Possible explanations for the presence of this gas include ionised gas being swept up by stellar winds and supernova explosions and, upon cooling, falling back into the