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Galactic halo

Index Galactic halo

A galactic halo is an extended, roughly spherical component of a galaxy which extends beyond the main, visible component. [1]

25 relations: Baryon, Bulge (astronomy), Cold dark matter, Cosmology, Dark matter, Dark matter halo, Disc galaxy, Elliptical galaxy, Escape velocity, Galactic coordinate system, Galactic corona, Galactic Disc, Galaxy formation and evolution, Gas, Globular cluster, Hubble's law, Milky Way, Navarro–Frenk–White profile, Newton's laws of motion, Plasma (physics), RR Lyrae variable, Spiral galaxy, Stellar halo, Subdwarf, Type-cD galaxy.

Baryon

A baryon is a composite subatomic particle made up of three quarks (a triquark, as distinct from mesons, which are composed of one quark and one antiquark).

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Bulge (astronomy)

In astronomy, a bulge is a tightly packed group of stars within a larger formation.

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Cold dark matter

In cosmology and physics, cold dark matter (CDM) is a hypothetical form of dark matter whose particles moved slowly compared to the speed of light (the cold in CDM) since the universe was approximately one year old (a time when the cosmic particle horizon contained the mass of one typical galaxy); and interact very weakly with ordinary matter and electromagnetic radiation (the dark in CDM).

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Cosmology

Cosmology (from the Greek κόσμος, kosmos "world" and -λογία, -logia "study of") is the study of the origin, evolution, and eventual fate of the universe.

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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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Disc galaxy

A disc galaxy is a galaxy characterized by a disc, a flattened circular volume of stars.

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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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Escape velocity

In physics, escape velocity is the minimum speed needed for an object to escape from the gravitational influence of a massive body.

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Galactic coordinate system

The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way galaxy, and the fundamental plane parallel to an approximation of the galactic plane but offset to its north.

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Galactic corona

The terms galactic corona and gaseous corona have been used in the first decade of the 21st century to describe a hot, ionised, gaseous component in the Galactic halo of the Milky Way.

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Galactic Disc

The Galactic Disc is a component of disc galaxies, such as spiral galaxies and lenticular galaxies.

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Galaxy formation and evolution

The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies.

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Gas

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).

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Globular cluster

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

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Hubble's law

Hubble's law is the name for the observation in physical cosmology that.

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Milky Way

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

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Navarro–Frenk–White profile

The Navarro–Frenk–White (NFW) profile is a spatial mass distribution of dark matter fitted to dark matter halos identified in N-body simulations by Julio Navarro, Carlos Frenk and Simon White.

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Newton's laws of motion

Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics.

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Plasma (physics)

Plasma (Henry George Liddell, Robert Scott, A Greek English Lexicon, on Perseus) is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s.

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RR Lyrae variable

RR Lyrae variables are periodic variable stars, commonly found in globular clusters.

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Spiral galaxy

Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae(pp. 124–151) and, as such, form part of the Hubble sequence.

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Stellar halo

The stellar halo of a galaxy refers to the component of its galactic halo containing stars.

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Subdwarf

A subdwarf, sometimes denoted by "sd", is a star with luminosity class VI under the Yerkes spectral classification system.

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Type-cD galaxy

The type-cD galaxy (also cD-type galaxy, cD galaxy) is a galaxy morphology classification, a subtype of type-D giant elliptical galaxy.

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Redirects here:

Galactic Halo, Galaxy halo, Halo (Milky Way), Halo (galaxy), Milky Way halo.

References

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

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