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Träfflista för sökning "WFRF:(Durret F.) ;pers:(Prokhorov Dmitry)"

Sökning: WFRF:(Durret F.) > Prokhorov Dmitry

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1.
  • Prokhorov, Dmitry, et al. (författare)
  • An analysis of electron distributions in galaxy clusters by means of the flux ratio of iron lines FeXXV and XXVI
  • 2009
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 496:1, s. 25-30
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims The interpretation of hard X-ray emission from galaxy clusters is still ambiguous and different proposed models can be probed using various observational methods. Here we explore a new method based on Fe-line observations. Methods. Spectral-line emissivities have usually been calculated by assuming a Maxwellian electron distribution. In this paper, a generalized approach to calculating the iron-line flux for a modified Maxwellian distribution is considered. Results. We calculated the flux ratio of iron lines for various possible populations of electrons proposed to account for measurements of hard X-ray excess-emission from the clusters A2199 and Coma. We found that the influence of the suprathermal electron population on the flux ratio is more significant in low temperature clusters (as Abell 2199) than in high temperature clusters (as Coma).
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2.
  • Prokhorov, Dmitry, et al. (författare)
  • An approximate theory for substructure propagation in clusters
  • 2007
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 474:2, s. 375-384
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims. The existence of dark matter can be proved in an astrophysical context by the discovery of a system in which the observed baryons and the inferred dark matter are spatially segregated, such as the bullet cluster (1E0657-558). The full descriptions of the dark matter halo and X-ray gas substructure motions are necessary to forecast the location of the dark halo from X-ray maps, which can be confirmed by the detection of a galaxy concentration or by gravitational lensing. Methods. We present an analytical hydrodynamic model to determine the distance between the X-ray and dark-matter components and the Mach number of the merger shock. Results. An approximate solution is given for the problem of the substructure propagation in merging clusters. A new method to predict the position of a dark matter halo in clusters, where there is a separation between the X-ray gas and the dark halo, is proposed and applied to the clusters 1E0657-558 and Abell 1763.
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Durret, F. (2)
Colafrancesco, S. (1)
Dogiel, V. (1)
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Linnéuniversitetet (2)
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Engelska (2)
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