Abell 1201 BCG (original) (raw)
Abell 1201 BGC est une galaxie elliptique massive résidant en tant que la galaxie la plus brillante de l'amas de galaxies Abell 1201, c'est une galaxie BCG (Brightest Cluster Galaxy). Le terme galaxie BCG signifie que cette galaxie est la plus brillante de l'amas dans laquelle elle se situe, comme dit dans le nom Abell 1201 BCG dans l'amas de galaxie Abell 1201. Cet amas se situe dans la constellation du Lion à 2,7 milliards d'années-lumière de la Terre.
| Property | Value |
|---|---|
| dbo:abstract | Abell 1201 BGC is a massive elliptical galaxyresiding as the brightest cluster galaxy of the galaxy cluster. At a redshift of 0.169, this system is around 2.7 billion light-years from Earth, and offset about 11 kiloparsecs from the X-ray peak of the intracluster gas. With an ellipticity of 0.32±0.02, the stellar distribution is far from spherical. In solar units, the total stellar luminosity is 4×1011 L☉ in SDSS r-band, and 1.6×1012 L☉ in 2MASS K-band. Half the stars orbit within an effective radius of 15 kpc, and their central velocity dispersion is about 285 km s−1 within 5 kpc rising to 360 km s−1 at 20 kpc distance. The BCG also acts as a gravitational lens, bending the light of a more distant background galaxy (at redshift 0.451) into an apparent tangential arc about 6 kpc to one side. This makes the galaxy an important case in investigations of the intrinsic properties of dark matter. Detailed models of the lens mass distribution, starlight and stellar kinematics indicates that the galaxy cluster's dark halo has a shallow inner density gradient and perhaps a soft dark matter core. At face value, this is incompatible with the dark matter cusp predicted by collisionless Cold dark matter theories, and adds to evidence that dark matter experiences additional non-gravitational forces. Years later, a faint smaller counterimage to the arc was discovered at a closer radius. Explaining the position and brightness of this counterimage requires a dark central concentration of unseen mass. Based on lens modelling, it could be a supermassive black hole equivalent to 13 billion suns: 1.3±0.6)×1010 M☉. At the time of measurement, this is one of the most massive black hole candidates (without relying on assumptions about quasar luminosities and efficiencies). This UMBH may be ten times larger than expected from the usual scaling relations between black holes and host galaxies. However, alternative methods of modelling the stellar velocity dispersion maps (accounting for an aggregate constraint on the lens mass) reveals an ambiguity between the UMBH mass and the dark halo profile. In solutions where the UMBH is more massive, the dark matter is more cuspy. In solutions where the UMBH is smaller or absent, the dark matter is more cored. The dark halo's ellipticity and the mass-to-light ratio of stars also enter the ambiguity. Thus, if the standard computational models are robust, then Abell 1201 BCG presents a dilemma and a challenge to either the conventional ideas of black hole growth or the simplest theories about dark matter, or both. (en) Abell 1201 BGC est une galaxie elliptique massive résidant en tant que la galaxie la plus brillante de l'amas de galaxies Abell 1201, c'est une galaxie BCG (Brightest Cluster Galaxy). Le terme galaxie BCG signifie que cette galaxie est la plus brillante de l'amas dans laquelle elle se situe, comme dit dans le nom Abell 1201 BCG dans l'amas de galaxie Abell 1201. Cet amas se situe dans la constellation du Lion à 2,7 milliards d'années-lumière de la Terre. (fr) |
| dbo:thumbnail | wiki-commons:Special:FilePath/Abell_1201_BCG.jpg?width=300 |
| dbo:type | dbr:Elliptical_galaxy dbr:Brightest_cluster_galaxy |
| dbo:wikiPageExternalLink | https://ned.ipac.caltech.edu/cgi-bin/objsearch%3Fsearch_type=Obj_id&objid=133358 |
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| dbo:wikiPageLength | 7190 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1029147084 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Cuspy_halo_problem dbr:Intracluster_medium dbr:List_of_most_massive_black_holes dbr:Scalar_field_dark_matter dbr:Strong_gravitational_lensing dbr:Mass-to-light_ratio dbr:Elliptical_galaxy dbr:Effective_radius dbr:Epoch_(astronomy) dbr:Leo_(constellation) dbr:Light-year dbc:Gravitational_lensing dbr:Dark_matter dbr:Galaxy_cluster dbr:2MASS dbc:Elliptical_galaxies dbc:Leo_(constellation) dbc:Principal_Galaxies_Catalogue_objects dbr:European_Southern_Observatory dbr:Flattening dbr:Brightest_cluster_galaxy dbr:Parsec dbr:Velocity_dispersion dbr:Quasar dbr:Multi_Unit_Spectroscopic_Explorer dbr:Solar_luminosity dbr:Supermassive_black_hole dbr:Cold_dark_matter dbr:Solar_mass dbr:Redshift dbr:Sloan_Digital_Sky_Survey dbr:M–sigma_relation dbr:Abell_1201 dbr:Self-interacting_dark_matter |
| dbp:absmagV | -24.230000 (xsd:double) |
| dbp:caption | A picture of A1201 BGC taken by MUSE. (en) |
| dbp:constellationName | dbr:Leo_(constellation) |
| dbp:credit | R. J. Smith et al, and European Southern Observatory (en) |
| dbp:distLy | 2.735000 (xsd:double) |
| dbp:ellipticity | 0.320000 (xsd:double) |
| dbp:epoch | dbr:Epoch_(astronomy) |
| dbp:groupCluster | dbr:Abell_1201 |
| dbp:halfLightRadiusPc | 15 (xsd:integer) |
| dbp:name | Abell 1201 BCG (en) |
| dbp:names | PGC 1430978 (en) |
| dbp:type | E3 elliptical galaxy, brightest cluster galaxy (en) |
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| dbp:z | 0.169000 (xsd:double) |
| dcterms:subject | dbc:Gravitational_lensing dbc:Elliptical_galaxies dbc:Leo_(constellation) dbc:Principal_Galaxies_Catalogue_objects |
| rdf:type | owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody wikidata:Q318 dbo:Galaxy |
| rdfs:comment | Abell 1201 BGC est une galaxie elliptique massive résidant en tant que la galaxie la plus brillante de l'amas de galaxies Abell 1201, c'est une galaxie BCG (Brightest Cluster Galaxy). Le terme galaxie BCG signifie que cette galaxie est la plus brillante de l'amas dans laquelle elle se situe, comme dit dans le nom Abell 1201 BCG dans l'amas de galaxie Abell 1201. Cet amas se situe dans la constellation du Lion à 2,7 milliards d'années-lumière de la Terre. (fr) Abell 1201 BGC is a massive elliptical galaxyresiding as the brightest cluster galaxy of the galaxy cluster. At a redshift of 0.169, this system is around 2.7 billion light-years from Earth, and offset about 11 kiloparsecs from the X-ray peak of the intracluster gas. With an ellipticity of 0.32±0.02, the stellar distribution is far from spherical. In solar units, the total stellar luminosity is 4×1011 L☉ in SDSS r-band, and 1.6×1012 L☉ in 2MASS K-band. Half the stars orbit within an effective radius of 15 kpc, and their central velocity dispersion is about 285 km s−1 within 5 kpc rising to 360 km s−1 at 20 kpc distance. (en) |
| rdfs:label | Abell 1201 BCG (en) Abell 1201 BCG (fr) |
| owl:sameAs | wikidata:Abell 1201 BCG dbpedia-fr:Abell 1201 BCG https://global.dbpedia.org/id/2qfNj |
| prov:wasDerivedFrom | wikipedia-en:Abell_1201_BCG?oldid=1029147084&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Abell_1201_BCG.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Abell_1201_BCG |
| foaf:name | Abell 1201 BCG (en) PGC 1430978 (en) |
| is dbo:wikiPageWikiLink of | dbr:List_of_most_massive_black_holes |
| is foaf:primaryTopic of | wikipedia-en:Abell_1201_BCG |
