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Post Info TOPIC: NGC 4884


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NGC 4889
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NGC 4889

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Located about 300 million light-years away in the Coma Cluster, the giant elliptical galaxy NGC 4889, the brightest and largest galaxy in this video, is home to a record-breaking supermassive black hole. Twenty-one billion times the mass of the Sun, this black hole has an event horizon - the surface at which even light cannot escape its gravitational grasp - with a diameter of approximately 130 billion kilometres. This is about 15 times the diameter of Neptune's orbit from the Sun. By comparison, the supermassive black hole at the centre of our galaxy, the Milky Way, is believed to have a mass about four million times that of the Sun and an event horizon just one fifth the orbit of Mercury. But the time when NGC 4889's black hole was swallowing stars and devouring dust is past. Astronomers believe that the gigantic black hole has stopped feeding, and is currently resting after feasting on NGC 4889's cosmic cuisine. The environment within the galaxy is now so peaceful that stars are forming from its remaining gas and orbiting undisturbed around the black hole. When it was active, NGC 4889's supermassive black hole was fuelled by the process of hot accretion. When galactic material - such as gas, dust and other debris - slowly fell inwards towards the black hole, it accumulated and formed an accretion disc. Orbiting the black hole, this spinning disc of material was accelerated by the black hole's immense gravitational pull and heated to millions of degrees. This heated material also expelled gigantic and very energetic jets. During its active period, astronomers would have classified NGC 4889 as a quasar and the disc around the supermassive black hole would have emitted up to a thousand times the energy output of the Milky Way. The accretion disc sustained the supermassive black hole's appetite until the nearby supply of galactic material was exhausted. Now, napping quietly as it waits for its next celestial snack, the supermassive black hole is dormant. However its existence allows astronomers to further their knowledge of how and where quasars, these still mysterious and elusive objects, formed in the early days of the Universe. Although it is impossible to directly observe a black hole - as light cannot escape its gravitational pull - its mass can be indirectly determined. Using instruments on the Keck II Observatory and Gemini North Telescope, astronomers measured the velocity of the stars moving around NGC 4889's centre. These velocities - which depend on the mass of the object they orbit - revealed the immense mass of the supermassive black hole.



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NGC 4884
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NGC 4889 (also NGC 4884, Caldwell 35, Coma B, UGC 8110 and PGC 44715) is a magnitude +11.5 class-4 supergiant elliptical galaxy located 308 ±3 million light-years away in the constellation Coma Berenices.
It belongs to the Abell 1656 (Coma) cluster of galaxies. The central region of Abell 1656 is dominated by the two supergiant elliptical galaxies: NGC 4874 and NGC 4889
The galaxy can be found near to NGC 4874, and the star HD 112887.

The galaxy was first discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 Merz-Refractor at the Copenhagen Observatory on the 22nd April 1865 and listed as NGC 4884.
The galaxy was rediscovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 11th April 1785 and relisted as NGC 4889.

In 1888 the astronomer John Louis Emil Dreyer published the New General Catalogue of Nebulae and Clusters of Stars (NGC), and erroneously duplicated the galaxy in two designations, NGC 4884 and NGC 4889 (Jack Sulentic and William Tifft in the Revised New General Catalogue of Nebulae and Clusters of Stars (RNGC) declared the galaxy NGC 4884 as identical to NGC 4889 in 1973). It was then decided that the object to be called by its latter designation, NGC 4889, which is in use today.

Right Ascension 13h 00m 08.1s, Declination +27° 58' 37"

Unlike a flattened, disc-shaped spiral galaxy like the Milky Way, NGC 4889 has no visible dust lanes or spiral arms and has a smooth, featureless, egg-shaped profile that diminishes in luminosity with distance from the center.
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