Ursa Major B or 3C 244.1 is a

radio galaxy A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure. These energetic radio lobes are powered by jets from its active galactic nucleus. They have luminosities up to 1039 W at radio wav ...

located in the

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...

Ursa Major Ursa Major, also known as the Great Bear, is a constellation in the Northern Sky, whose associated mythology likely dates back into prehistory. Its Latin name means "greater (or larger) bear", referring to and contrasting it with nearby Ursa M ...

. It is classified as a Fanaroff-Riley Type II (FRII) radio source, which means that the luminosity increases with distance from the core. There are two, asymmetrical radio-emitting lobes straddling the parent galaxy. These lobes have an angular separation of 52″ at a

position angle In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky. The International Astronomical Union defines it as the angle measured relative to the Celestial pole, north celestial pole (NCP), turning pos ...

of 168°. When measured in the optical band, this galaxy has a redshift value of ''z'' = 0.428, corresponding to a distance of 1.5

Gpc GPC may refer to: Businesses and organisations Politics * General People's Congress (disambiguation) * Goa People's Congress, in India * Green Party of Canada * Group of Cameroonian Progressives Other businesses and organisations * Genuine ...

. 3C 244.1 is located within a cluster of other galaxies. Observations with the

Hubble Space Telescope The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the Orbiting Solar Observatory, first space telescope, but it is one of the largest and most ...

show an

elliptical galaxy 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 galaxy morphological classification, classes of galaxy described by Edwin Hubble in his Hub ...

with blobs and a filamentary structure. The radio jets being generated by the

active galactic nucleus An active galactic nucleus (AGN) is a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars. Such e ...

are interacting with the

interstellar medium The interstellar medium (ISM) is the matter and radiation that exists in the outer space, space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as cosmic dust, dust and cosmic rays. It f ...

, producing extended narrow line regions. These features are commonly associated with many active galaxies. The axial ratio of the elliptical galaxy is 1.4, meaning it is about 1.4 times large along the primary axis than along the perpendicular axis. At the nucleus of this galaxy is a

supermassive black hole A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun (). Black holes are a class of astronomical ...

with an estimated

solar mass The solar mass () is a frequently used unit of mass in astronomy, equal to approximately . It is approximately equal to the mass of the Sun. It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxie ...

es. The dimensionless ratio of the black hole spin to the black hole mass-energy ''j'' is .

References

External links

www.jb.man.ac.uk/atlas/
* {{Portal bar, Astronomy, Stars, Outer space Radio galaxies Ursa Major 244.1 +58.21 2821461

See also

References

External links