Оңтүстік Бұрқыншақ шоқжұлдызындағы радио галактикасы

Radio galaxy in the constellation Centaurus

Centaurus A (also known as NGC 5128 or Caldwell 77) is a galaxy in the constellation of Centaurus. It was discovered in 1826 by Scottish astronomer James Dunlop from his home in Parramatta, in New South Wales, Australia. There is considerable debate in the literature regarding the galaxy's fundamental properties such as its Hubble type (lenticular galaxy or a giant elliptical galaxy) The galaxy is also the fifth brightest in the sky, It is only visible from the southern hemisphere and low northern latitudes. The center of the galaxy contains a supermassive black hole with a mass of 55 million solar masses, which ejects a relativistic jet that is responsible for emissions in the X ray and radio wavelengths. By taking radio observations of the jet separated by a decade, astronomers have determined that the inner parts of the jet are moving at about half of the speed of light. X rays are produced farther out as the jet collides with surrounding gases, resulting in the creation of highly energetic particles. The X ray jets of Centaurus A are thousands of light years long, while the radio jets are over a million light years long. As in other starburst galaxies, a galactic collision is suspected to be responsible for an intense burst of star formation. Models have suggested that Centaurus A was a large elliptical galaxy that collided with a smaller spiral galaxy, with which it will eventually merge. For that reason, the galaxy has been of particular interest to astronomers for years. While collisions of spiral galaxies are relatively common, the effects of a collision between an elliptical and a spiral galaxy are not fully understood.

NGC 5128 was discovered on 29 April 1826 by James Dunlop during a survey at the Parramatta Observatory. In 1847 John Herschel described the galaxy as "two semi ovals of elliptically formed nebula appearing to be cut asunder and separated by a broad obscure band parallel to the larger axis of the nebula, in the midst of which a faint streak of light parallel to the sides of the cut appears." In 1949 John Gatenby Bolton, Bruce Slee and Gordon Stanley localized NGC 5128 as one of the first extragalactic radio sources. Five years later, Walter Baade and Rudolph Minkowski suggested that the peculiar structure is the result of a merge event of a giant elliptical galaxy and a small spiral galaxy. The first detection of X ray emissions, using a sounding rocket, was performed in 1970. In 1975–76 gamma ray emissions from Centaurus A were observed through the atmospheric Cherenkov technique. The Einstein Observatory detected an X ray jet emanating from the nucleus in 1979. Ten years later, young blue stars were found along the central dust band with the Hubble Space Telescope. The Chandra X ray Observatory identified in 1999 more than 200 new point sources. Another space telescope, the Spitzer Space Telescope, found a parallelogram shaped structure of dust in near infrared images of Centaurus A in 2006. Evidence of gamma emissions with very high energy (more than 100 GeV) was detected by the H. E. S. S Observatorium in Namibia in 2009. The following year, Centaurus A was identified as a source of cosmic rays of highest energies, after years of observations by Pierre Auger Observatory. In 2016 a review of data from Chandra and XMM Newton, unusual high flares of energy were found in NGC 5128 and the galaxy NGC 4636. Jimmy Irwin of University of Alabama hypothesized the discovery as potentially a black hole in a yet unknown process or an intermediate mass black hole.

Centaurus A may be described as having a peculiar morphology. As seen from Earth, the galaxy looks like a lenticular or elliptical galaxy with a superimposed dust lane. The peculiarity of this galaxy was first identified in 1847 by John Herschel, and the galaxy was included in Halton Arp's Atlas of Peculiar Galaxies (published in 1966) as one of the best examples of a "disturbed" galaxy with dust absorption. The galaxy's strange morphology is generally recognized as the result of a merger between two smaller galaxies. The bulge of this galaxy is composed mainly of evolved red stars.

Distance estimates to Centaurus A established since the 1980s typically range between 3–5 Mpc. Mira variables and Type II Cepheids The distance to Centaurus A established from several indicators such as Mira variables and planetary nebulae favour a more distant value of ~3.8 Mpc.

Centaurus A is at the center of one of two subgroups within the Centaurus A/M83 Group, a nearby group of galaxies. Messier 83 (the Southern Pinwheel Galaxy) is at the center of the other subgroup. These two groups are sometimes identified as one group and sometimes identified as two groups. However, the galaxies around Centaurus A and the galaxies around M83 are physically close to each other, and both subgroups appear not to be moving relative to each other. The Centaurus A/M83 Group is located in the Virgo Supercluster. In addition to dwarf galaxies, Centaurus A, like most galaxies, has a population of globular clusters. Some objects that appear to be globular clusters are hypothesized to be the tidally stripped cores of former galaxies. The most extreme example is the object VHH81 01, whose central black hole is estimated to be around .

In July 2021 the Event Horizon Telescope released a resolved image of Centaurus A showing the jet coming from the black hole at its center.

Centaurus A is located approximately 4° north of Omega Centauri (a globular cluster visible with the naked eye).