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dc.contributor.authorKrause, M.
dc.date.accessioned2017-04-19T14:31:31Z
dc.date.available2017-04-19T14:31:31Z
dc.date.issued2005-02-02
dc.identifier.citationKrause , M 2005 , ' Very light jets II: Bipolar large scale simulations in King atmospheres ' , Astronomy & Astrophysics , vol. 431 , pp. 45-64 . https://doi.org/10.1051/0004-6361:20041191
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 10546117
dc.identifier.otherPURE UUID: f1ab3141-5257-48d7-a913-57edbfb6fb19
dc.identifier.otherBibtex: urn:b8ee4c3542462714f363b13c8050a118
dc.identifier.otherScopus: 13844298062
dc.identifier.otherORCID: /0000-0002-9610-5629/work/63687422
dc.identifier.urihttp://hdl.handle.net/2299/17972
dc.descriptionM. Krause, 'Very light jets II: Bipolar large scale simulations in King atmospheres', Astronomy & Astrophysics, Vol. 431 (1): 45-64, February 2005, available online at DOI : https://doi.org/10.1051/0004-6361:20041191
dc.description.abstractHydrodynamic jets, underdense with respect to their environment by a factor of up to 104, were computed in axisymmetry as well as in 3D. They finally reached a size of up to 220 jet radii, corresponding to a 100 kpc sized radio galaxy. The simulations are “bipolar”, involving both jets. These are injected into a King type density profile with small stochastic density variations. The back-reaction of the cocoons on the beams in the center produces armlength asymmetries of a few percent, with the longer jets on the side with the higher average density. Two distinguishable bow shock phases were observed: an inner elliptical part, and a later cylindrical, cigar-like phase, which is known from previous simulations. The sideways motion of the inner elliptical bow shock part is shown to follow the law of motion for spherical blast waves also in the late phase, where the aspect ratio is high, with good accuracy. X-ray emission maps are calculated and the two bow shock phases are shown to appear as rings and elongated or elliptical regions, depending on the viewing angle. Such structures are observed in the X-ray data of several radio galaxies (e.g. in Abell 2052 and Hercules A), the best example being Cygnus A. In this case, an elliptical bow shock is infered from the observations, a jet power of 1047 erg/s is derived, and the Lorentz factor can be limited to Γ > 10. Based on the simulation results and the comparison to the observations, the emission line gas producing the alignment effect in radio galaxies at high redshift is suggested to be cooled gas entrained over the cocoon boundaryen
dc.format.extent20
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjecthydrodynamics
dc.subjectinstabilities
dc.subjectshock waves
dc.subjectgalaxies: active
dc.subjectradio continuum: galaxies
dc.subjectX-rays: galaxies: clusters
dc.titleVery light jets II: Bipolar large scale simulations in King atmospheresen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.aanda.org/articles/aa/pdf/2005/07/aa1191.pdf
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361:20041191
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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