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The giant elliptical galaxy ESO 325-4. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, [1] along with spiral and lenticular galaxies.
Spiral galaxy UGC 12591 is classified as an S0/Sa galaxy. [1]The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926. [2] [3] It is often known colloquially as the “Hubble tuning-fork” because of the shape in which it is traditionally represented.
NGC 4564 is an elliptical galaxy located about 57 million light-years away [2] in the constellation Virgo. [3] NGC 4564 was discovered by astronomer William Herschel on March 15, 1784. [4] The galaxy is also a member of the Virgo Cluster. [5] [6] NGC 4564 has an estimated population of 213 ± 31 globular clusters. [7]
This is an elliptical galaxy of type E 1 + 1 ⁄ 2 (E1.5), although some sources class it as S0 – a lenticular galaxy. An E2 class indicates a flattening of 20%, which has a nearly round appearance. The isophotes of the galaxy are boxy in shape, rather than simple ellipses.
M32 is a satellite galaxy of the Andromeda Galaxy (M31) and was discovered by Guillaume Le Gentil in 1749. The galaxy is a prototype of the relatively rare compact elliptical (cE) class. Half the stars concentrate within inner core with an effective radius of 330 light-years (100 pc).
At the centre of the Hubble tuning fork, where the two spiral-galaxy branches and the elliptical branch join, lies an intermediate class of galaxies known as lenticulars and given the symbol S0. These galaxies consist of a bright central bulge, similar in appearance to an elliptical galaxy, surrounded by an extended, disk-like
ESO 383-76 is a supergiant elliptical galaxy (type-cD galaxy) of an advanced Hubble morphology (E5, with E0 being spherical and E7 being flattened), with its major axis being more than twice the length of its minor axis. The galaxy is a very luminous source of X-rays, and is the sixth-brightest X-ray source in the sky. [3]
Elliptical galaxy-Faber–Jackson relation; Fundamental plane (elliptical galaxies) * Dwarf elliptical galaxy; Dwarf spheroidal galaxy; 0–9. 2MASX J09175344+5143379;