II Hz 4

II Hz 4 is categorized as a classical double ring galaxy, depicted as having an off-center nucleus within its ring structure and a secondary faint ring feature.^[3][4][2][5] The nucleus galaxy is connected by two spiral arms that are described to have a faint appearance, with one of them shown as extended to join the ring feature located south.^[4]

A separate low-surface brightness ring-like feature is seen, with its size exactly similar to the ring. There is an apparent galaxy companion located with the faint northern ring with an extension terminating at the edge of the second ring feature.^[2] The rings have an approximate size of 21.6 x 15.7 and 22.8 and 16.9 kiloparsecs when imaged in both K-band and hydrogen-alpha imaging.^[4] A tidal tail with a blue appearance is seen connecting to the companion hinting an interaction.^[3]

A study published in December 1998, found the presence of ring knots in the galaxy. Based on observations, the estimated model ages of the knots are between six and eight million years.^[6] Evidence also found, the two nuclei of the galaxy have a recession velocity differences of 50 kilometers per seconds, with the primary ring feature being inclined at 42° and has a rotation velocity of 28 kilometers per seconds.^[7]

• II Hz 4 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images