skip to main content
Idioma:

Comparison of approximately isothermal gravitational potentials of elliptical galaxies based on X-ray and optical data

Churazov, E. ; Tremaine, S. ; Forman, W. ; Gerhard, O. ; Das, P. ; Vikhlinin, A. ; Jones, C. ; Böhringer, H. ; Gebhardt, K.

Monthly notices of the Royal Astronomical Society, 2010-05, Vol.404 (3), p.1165-1185 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Comparison of approximately isothermal gravitational potentials of elliptical galaxies based on X-ray and optical data
  • Autor: Churazov, E. ; Tremaine, S. ; Forman, W. ; Gerhard, O. ; Das, P. ; Vikhlinin, A. ; Jones, C. ; Böhringer, H. ; Gebhardt, K.
  • Assuntos: Astrophysics ; galaxies: kinematics and dynamics ; Gravity ; Kinematics ; X-ray astronomy ; X-rays: galaxies: clusters
  • É parte de: Monthly notices of the Royal Astronomical Society, 2010-05, Vol.404 (3), p.1165-1185
  • Notas: ark:/67375/HXZ-DWNP71Q3-F
    istex:203315AF847F6BA1E90082EF48C4FCE1AA43C5E5
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: We analyse six X-ray bright elliptical galaxies, observed with Chandra and XMM–Newton, and approximate their gravitational potentials by isothermal spheres ϕ=v2c log r over a range of radii from ∼0.5 to ∼25 kpc. We then compare the circular speed vc derived from X-ray data with the estimators available from optical data. In particular, we discuss two simple and robust procedures for evaluating the circular speed of the galaxy using the observed optical surface brightness and the line-of-sight velocity dispersion profiles. The best-fitting relation between the circular speeds derived from optical observations of stars and X-ray observations of hot gas is vc,opt≃ηvc,X, where η= 1.10–1.15 (depending on the method), suggesting, albeit with large statistical and systematic uncertainties, that non-thermal pressure on average contributes ∼20–30 per cent of the gas thermal pressure.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês;Russo
Links
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.