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Galaxy group

Index Galaxy group

A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters. [1]

31 relations: Bullet Group, Cambridge University Press, Constellation, Dark matter, Dark matter halo, Dwarf galaxy, Dynamical friction, Earth, Elliptical galaxy, Galaxy, Galaxy cluster, Galaxy group, Galaxy groups and clusters, Gravitational binding energy, Hercules (constellation), Hickson Compact Group, Illustris project, Intracluster medium, Light-year, Local Group, Luminosity, Milky Way, Orders of magnitude (length), Parsec, ProQuest, Protogalaxy, SIMBAD, Solar mass, Stephan's Quintet, Sun, Supercluster.

Bullet Group

The Bullet Group (SL2S J08544-0121) is a newly merging group of galaxies, a merger between two galaxy groups to form a new larger one, that recently had a high speed collision between the two component groups.

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Cambridge University Press

Cambridge University Press (CUP) is the publishing business of the University of Cambridge.

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Constellation

A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.

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Dark matter

Dark matter is a theorized form of matter that is thought to account for approximately 80% of the matter in the universe, and about a quarter of its total energy density.

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Dark matter halo

A dark matter halo is a hypothetical component of a galaxy that envelops the galactic disc and extends well beyond the edge of the visible galaxy.

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Dwarf galaxy

A dwarf galaxy is a small galaxy composed of about 100 million up to several billion stars, a small number compared to the Milky Way's 200–400 billion stars.

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Dynamical friction

In astrophysics, dynamical friction or Chandrasekhar friction, sometimes called gravitational drag, is loss of momentum and kinetic energy of moving bodies through gravitational interactions with surrounding matter in space.

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Earth

Earth is the third planet from the Sun and the only astronomical object known to harbor life.

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Elliptical galaxy

An elliptical galaxy is a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image.

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Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

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Galaxy cluster

A galaxy cluster, or cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity with typical masses ranging from 1014–1015 solar masses.

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Galaxy group

A galaxy group or group of galaxies (GrG) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 1010 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters.

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Galaxy groups and clusters

Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation.

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Gravitational binding energy

A gravitational binding energy is the minimum energy that must be added to a system for the system to cease being in a gravitationally bound state.

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Hercules (constellation)

Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.

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Hickson Compact Group

A Hickson Compact Group (abbreviation: HCG) is a collection of galaxies designated as published by Paul Hickson in 1982.

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Illustris project

The Illustris project is an ongoing series of astrophysical simulations run by an international collaboration of scientists.

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Intracluster medium

In astronomy, the intracluster medium (ICM) is the superheated plasma that permeates a galaxy cluster.

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Light-year

The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.

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Local Group

The Local Group is the galaxy group that includes the Milky Way.

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Luminosity

In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.

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Milky Way

The Milky Way is the galaxy that contains our Solar System.

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Orders of magnitude (length)

The following are examples of orders of magnitude for different lengths.

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Parsec

The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.

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ProQuest

ProQuest LLC is an Ann Arbor, Michigan-based global information-content and technology company, founded in 1938 as University Microfilms by Eugene B. Power.

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Protogalaxy

In physical cosmology, a protogalaxy, which could also be called a "primeval galaxy", is a cloud of gas which is forming into a galaxy.

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SIMBAD

SIMBAD (the Set of Identifications, Measurements, and Bibliography for Astronomical Data) is an astronomical database of objects beyond the Solar System.

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Solar mass

The solar mass is a standard unit of mass in astronomy, equal to approximately.

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Stephan's Quintet

Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered.

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Sun

The Sun is the star at the center of the Solar System.

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Supercluster

A supercluster is a large group of smaller galaxy clusters or galaxy groups; it is among the largest-known structures of the cosmos.

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Redirects here:

Compact galaxy group, Compact group of galaxies, Fossil cluster, Fossil galaxy cluster, Fossil galaxy group, Fossil group of galaxies, Galaxy compact group, Galaxy groups, Galaxy subgroup, Galaxy subgroups, Group of galaxies, Groups of galaxies.

References

[1] https://en.wikipedia.org/wiki/Galaxy_group

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