NGC 7007 is a

lenticular galaxy A lenticular galaxy (denoted S0) is a Galaxy morphological classification, type of galaxy intermediate between an elliptical galaxy, elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes. It contains a large-s ...

with a small

bar Bar or BAR may refer to: Food and drink * Bar (establishment), selling alcoholic beverages * Candy bar ** Chocolate bar * Protein bar Science and technology * Bar (river morphology), a deposit of sediment * Bar (tropical cyclone), a laye ...

, around 100 million

light-year A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by the International Astr ...

s away from

Earth Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...

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 ...

Indus The Indus ( ) is a transboundary river of Asia and a trans- Himalayan river of South and Central Asia. The river rises in mountain springs northeast of Mount Kailash in the Western Tibet region of China, flows northwest through the dis ...

. It was discovered by astronomer

John Herschel Sir John Frederick William Herschel, 1st Baronet (; 7 March 1792 – 11 May 1871) was an English polymath active as a mathematician, astronomer, chemist, inventor and experimental photographer who invented the blueprint and did botanical work. ...

on July 8, 1834. The galaxy is a type 2 seyfert galaxy, and is host to 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 mass of 4.9 × 10⁷ M_☉. Like all lenticular galaxies, NGC 7007 has a classical disk similar to most galaxies of its type, having a nearly spherical bulge. Unlike most galaxies of its type, the pattern of dust in NGC 7007 is not circular and continuous surrounding the bulge but shows breaks in its structure. These dust lanes also appear to form dusty spiral arms similar to the Sa galaxies NGC 2855,

NGC 4984 NGC 4984 is an intermediate lenticular galaxy exhibiting a double ring structure in the constellation Virgo. It is a member of the NGC 4856 Group of galaxies, which is a member of the Virgo II Groups, a series of galaxies and galaxy clusters st ...

, and NGC 7377. NGC 7007 is an isolated galaxy, with it a part of the

Telescopium−Grus Cloud The Telescopium−Grus Cloud is a galaxy filament in the constellations of Pavo, Indus, and Telescopium. It was first defined by astronomer R. Brent Tully, Brent Tully in his book ''The Nearby Galaxies Atlas'' and its companion book ''The Nearby ...

, a

galaxy filament In cosmology, galaxy filaments are the largest known structures in the universe, consisting of walls of galactic superclusters. These massive, thread-like formations can commonly reach 50 to 80 megaparsecs ()—with the largest found to date b ...

Counter-rotating disk

In NGC 7007, there is counter-rotating disk of

ionized Ionization or ionisation is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons, often in conjunction with other chemical changes. The resulting electrically charged atom or molecule i ...

gas that counter-rotates with respect to the stars. This indicates an external origin of the gas such as accretion.

References

External links

{{Indus (constellation) Astronomical objects discovered in 1834 Barred lenticular galaxies Seyfert galaxies Indus (constellation) 7007 66069 Field galaxies Telescopium−Grus Cloud

Counter-rotating disk

See also

References

External links