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De Vaucouleurs also assigned numerical values to each class of galaxy in his scheme. Values of the numerical Hubble stage T run from −6 to +10, with negative numbers corresponding to early-type galaxies (ellipticals and lenticulars) and positive numbers to late types (spirals and irregulars). [18]
Hubble defined two classes of irregular galaxy: [16] Irr I galaxies have asymmetric profiles and lack a central bulge or obvious spiral structure; instead they contain many individual clusters of young stars; Irr II galaxies have smoother, asymmetric appearances and are not clearly resolved into individual stars or stellar clusters
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 galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae [1] and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars , gas and dust , and a central concentration of stars known as the bulge .
Most massive galaxy ESO 146-IG 005 ~30×10 12 M Sun: Central galaxy in Abell 3827, 1.4 Gly distant. [143] [144] Most dense galaxy M85-HCC1: This is an ultra-compact dwarf galaxy [145] Least dense galaxy Most massive spiral galaxy ISOHDFS 27: 1.04 × 10 12 M Sun: The preceding most massive spiral was UGC 12591 [146] Least massive galaxy with ...
UGC 2885 is a spiral galaxy with a relatively low surface brightness. The central bulge is the most prominent feature of this galaxy, where a faint bar crosses its center. UGC 2885 is classified as a field galaxy—a class of galaxies found in remote, under-dense and "vacant" sections of space, far from other major galaxies.
Abell 2744 galaxy cluster – Hubble Frontier Fields view (7 January 2014). [1] Abell 383, the giant cluster of elliptical galaxies in the centre of this image, contains so great a mass of dark matter that its gravity bends the light from a background object into an arc, a phenomenon known as strong gravitational lensing.
The brightest galaxy in the image is named SDSS J1156+1911, taken by Hubble [9] BCGs are divided into various classes of galaxies: giant ellipticals (gE), D galaxies and cD galaxies . [ 10 ] cD and D galaxies both exhibit an extended diffuse envelope surrounding an elliptical-like nucleus akin to regular elliptical galaxies.