Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Velocity_dispersion> ?p ?o }
Showing triples 1 to 76 of
76
with 100 triples per page.
- Velocity_dispersion abstract "In astronomy, the velocity dispersion (σ) is the statistical dispersion of velocities about the mean velocity for a group of objects, such as an open cluster, globular cluster, galaxy, galaxy cluster, or supercluster. By measuring the radial velocities of its members, the velocity dispersion of a cluster can be estimated and used to derive the cluster's mass from the virial theorem. Radial velocity is found by measuring the Doppler width of spectral lines of a collection of objects. The more radial velocities one measures, the more accurately one knows their dispersion. A central velocity dispersion refers to the σ of the interior regions of an extended object, such as a galaxy or cluster.The relationship between velocity dispersion and matter (or the observed electromagnetic radiation emitted by this matter) takes several forms in astronomy based on the object(s) being observed. For instance, the M–σ relation was found for material circling black holes, the Faber–Jackson relation for elliptical galaxies, and the Tully–Fisher relation for spiral galaxies. For example, the σ found for objects about the Milky Way's supermassive black hole (SMBH) is about 75 km/s. The Andromeda Galaxy (Messier 31) hosts a SMBH about 10 times larger than our own, and has a σ ≈ 160 km/s.Groups and clusters of galaxies have a wider range of velocity dispersions than smaller objects. For example, our own poor group, the Local Group, has a σ = 61±8 km/s. But rich clusters of galaxies, such as the Coma Cluster, have a σ ≈ 1,000 km/s. The dwarf elliptical galaxies in Coma have their own, internal, velocity dispersion for their stars, which is a σ ≲ 80 km/s, typically. Normal elliptical galaxies, by comparison, have an average σ ≈ 200 km/s.For spiral galaxies, the increase in velocity dispersion in population I stars is a gradual process which likely results from the random momentum exchanges, known as dynamical friction, between individual stars and large interstellar gas and dust clouds with masses ≳ 105 M☉. Face-on spiral galaxies have a central σ ≲ 90 km/s; slightly more if viewed edge-on.".
- Velocity_dispersion wikiPageID "23874520".
- Velocity_dispersion wikiPageLength "7403".
- Velocity_dispersion wikiPageOutDegree "43".
- Velocity_dispersion wikiPageRevisionID "681544267".
- Velocity_dispersion wikiPageWikiLink Abell_catalogue.
- Velocity_dispersion wikiPageWikiLink Andromeda_Galaxy.
- Velocity_dispersion wikiPageWikiLink Arithmetic_mean.
- Velocity_dispersion wikiPageWikiLink Astronomical_spectroscopy.
- Velocity_dispersion wikiPageWikiLink Astronomy.
- Velocity_dispersion wikiPageWikiLink Black_hole.
- Velocity_dispersion wikiPageWikiLink Black_holes.
- Velocity_dispersion wikiPageWikiLink Category:Celestial_mechanics.
- Velocity_dispersion wikiPageWikiLink Category:Extragalactic_astronomy.
- Velocity_dispersion wikiPageWikiLink Category:Galactic_astronomy.
- Velocity_dispersion wikiPageWikiLink Coma_Cluster.
- Velocity_dispersion wikiPageWikiLink Doppler_broadening.
- Velocity_dispersion wikiPageWikiLink Dwarf_elliptical_galaxies.
- Velocity_dispersion wikiPageWikiLink Dwarf_elliptical_galaxy.
- Velocity_dispersion wikiPageWikiLink Dynamical_friction.
- Velocity_dispersion wikiPageWikiLink Elliptical_galaxies.
- Velocity_dispersion wikiPageWikiLink Elliptical_galaxy.
- Velocity_dispersion wikiPageWikiLink Faber–Jackson_relation.
- Velocity_dispersion wikiPageWikiLink Galaxy.
- Velocity_dispersion wikiPageWikiLink Galaxy_cluster.
- Velocity_dispersion wikiPageWikiLink Globular_cluster.
- Velocity_dispersion wikiPageWikiLink Interstellar_medium.
- Velocity_dispersion wikiPageWikiLink s.
- Velocity_dispersion wikiPageWikiLink Local_Group.
- Velocity_dispersion wikiPageWikiLink Messier_object.
- Velocity_dispersion wikiPageWikiLink Metallicity.
- Velocity_dispersion wikiPageWikiLink Metre_per_second.
- Velocity_dispersion wikiPageWikiLink Milky_Way.
- Velocity_dispersion wikiPageWikiLink Momentum.
- Velocity_dispersion wikiPageWikiLink M–sigma_relation.
- Velocity_dispersion wikiPageWikiLink Open_cluster.
- Velocity_dispersion wikiPageWikiLink Radial_velocities.
- Velocity_dispersion wikiPageWikiLink Radial_velocity.
- Velocity_dispersion wikiPageWikiLink Spectral_line.
- Velocity_dispersion wikiPageWikiLink Spectral_lines.
- Velocity_dispersion wikiPageWikiLink Spiral_galaxies.
- Velocity_dispersion wikiPageWikiLink Spiral_galaxy.
- Velocity_dispersion wikiPageWikiLink Statistical_dispersion.
- Velocity_dispersion wikiPageWikiLink Supercluster.
- Velocity_dispersion wikiPageWikiLink Supermassive_black_hole.
- Velocity_dispersion wikiPageWikiLink Supermassive_black_holes.
- Velocity_dispersion wikiPageWikiLink Tully–Fisher_relation.
- Velocity_dispersion wikiPageWikiLink Velocity.
- Velocity_dispersion wikiPageWikiLink Virial_theorem.
- Velocity_dispersion wikiPageWikiLinkText "Velocity dispersion".
- Velocity_dispersion wikiPageWikiLinkText "dispersion velocity".
- Velocity_dispersion wikiPageWikiLinkText "dispersion".
- Velocity_dispersion wikiPageWikiLinkText "random velocities".
- Velocity_dispersion wikiPageWikiLinkText "velocity dispersion".
- Velocity_dispersion hasPhotoCollection Velocity_dispersion.
- Velocity_dispersion wikiPageUsesTemplate Template:Reflist.
- Velocity_dispersion wikiPageUsesTemplate Template:Solar_mass.
- Velocity_dispersion subject Category:Celestial_mechanics.
- Velocity_dispersion subject Category:Extragalactic_astronomy.
- Velocity_dispersion subject Category:Galactic_astronomy.
- Velocity_dispersion hypernym Dispersion.
- Velocity_dispersion type Factor.
- Velocity_dispersion type Mechanic.
- Velocity_dispersion type Physic.
- Velocity_dispersion type Sub-discipline.
- Velocity_dispersion comment "In astronomy, the velocity dispersion (σ) is the statistical dispersion of velocities about the mean velocity for a group of objects, such as an open cluster, globular cluster, galaxy, galaxy cluster, or supercluster. By measuring the radial velocities of its members, the velocity dispersion of a cluster can be estimated and used to derive the cluster's mass from the virial theorem. Radial velocity is found by measuring the Doppler width of spectral lines of a collection of objects.".
- Velocity_dispersion label "Velocity dispersion".
- Velocity_dispersion sameAs Geschwindigkeitsdispersion.
- Velocity_dispersion sameAs Dispersion_des_vitesses.
- Velocity_dispersion sameAs Dispersione_di_velocità.
- Velocity_dispersion sameAs 속도분산.
- Velocity_dispersion sameAs m.076zyxq.
- Velocity_dispersion sameAs Q637450.
- Velocity_dispersion sameAs Q637450.
- Velocity_dispersion wasDerivedFrom Velocity_dispersion?oldid=681544267.
- Velocity_dispersion isPrimaryTopicOf Velocity_dispersion.