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Przeglądanie wg autora "Otmianowska-Mazur, Katarzyna"

Repozytorium Uniwersytetu Mikołaja Kopernika

Przeglądanie wg autora "Otmianowska-Mazur, Katarzyna"

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  • 3D model of magnetic fields evolution in dwarf irregular galaxies 
    Siejkowski, Hubert; Soida, Marian; Otmianowska-Mazur, Katarzyna; Hanasz, Michał; Bomans, Dominik J. (2011-01-12)
    Radio observations show that magnetic fields are present in dwarf irregular galaxies (dIrr) and its strength is comparable to that found in spiral galaxies. Slow rotation, weak shear and shallow gravitational potential are ...
  • Amplification of Galactic Magnetic Fields by the Cosmic-Ray Driven Dynamo 
    Hanasz, Michał; Kowal, Grzegorz; Otmianowska-Mazur, Katarzyna; Lesch, Harald (2004-02-27)
    We present the first numerical model of the magnetohydrodynamical cosmic-ray (CR) driven dynamo of the type proposed by Parker (1992). The driving force of the amplification process comes from CRs injected into the galactic ...
  • Can the cosmic-ray driven dynamo model explain the observations of the polarized emission of edge-on galaxies? 
    Otmianowska-Mazur, Katarzyna; Soida, Marian; Kulesza-Żydzik, Barbara; Hanasz, Michał; Kowal, Grzegorz (2008-12-11)
    In the present paper we construct maps of polarized synchrotron radio emission of a whole galaxy, based on local models of the cosmic ray (CR) driven dynamo. We perform numerical simulations of the dynamo in local Cartesian ...
  • Cosmic-ray driven dynamo in galactic disks 
    Hanasz, Michał; Otmianowska-Mazur, Katarzyna; Lesch, Harald; Kowal, Grzegorz; Soida, Marian; Wóltański, Dominik; Kowalik, Kacper; Pawłaszek, Rafał; Kulesza-Żydzik, Barbara (2008-12-31)
    We present new developments on the Cosmic--Ray driven, galactic dynamo, modeled by means of direct, resistive CR--MHD simulations, performed with ZEUS and PIERNIK codes. The dynamo action, leading to the amplification of ...
  • Cosmic-ray driven dynamo in the interstellar medium of irregular galaxies 
    Siejkowski, Hubert; Soida, Marian; Otmianowska-Mazur, Katarzyna; Hanasz, Michał; Bomans, Dominik J. (2010-09-27)
    Irregular galaxies are usually smaller and less massive than their spiral, S0, and elliptical counterparts. Radio observations indicate that a magnetic field is present in irregular galaxies whose value is similar to that ...
  • Cosmic-ray driven dynamo in the medium of irregular galaxy 
    Siejkowski, Hubert; Soida, Marian; Otmianowska-Mazur, Katarzyna; Hanasz, Michał; Bomans, Dominik J. (2009-01-12)
    We investigate the cosmic ray driven dynamo in the interstellar medium of irregular galaxy. The observations (Chyzy et al. 2000, 2003) show that the magnetic field in irregular galaxies is present and its value reaches the ...
  • Cosmic ray driven dynamo in barred and ringed galaxies 
    Kulpa-Dybeł, K.; Otmianowska-Mazur, Katarzyna; Kulesza-Żydzik, Barbara; Kowal, Grzegorz; Wóltański, Dominik; Hanasz, Michał; Kowalik, Kacper (2011-01-02)
    We study the global evolution of the magnetic field and interstellar medium (ISM) of the barred and ringed galaxies in the presence of non-axisymmetric components of the potential, i.e. the bar and/or the oval perturbations. ...
  • Cosmic ray driven dynamo in galactic disks. A parameter study 
    Hanasz, Michał; Otmianowska-Mazur, Katarzyna; Kowal, Grzegorz; Lesch, Harald (2008-12-19)
    We present a parameter study of the magnetohydrodynamical dynamo driven by cosmic rays in the interstellar medium (ISM) focusing on the efficiency of magnetic field amplification and the issue of energy equipartition between ...
  • Discussion of the Electromotive Force Terms in the Model of Parker-unstable Galactic Disks with Cosmic Rays and Shear 
    Otmianowska-Mazur, Katarzyna; Kowal, Grzegorz; Hanasz, Michał (2007-10-17)
    We analyze the electromotive force (EMF) terms and basic assumptions of the linear and nonlinear dynamo theories in our three-dimensional (3D) numerical model of the Parker instability with cosmic rays and shear in a ...
  • Global simulations of the magnetic field evolution under the influence of the cosmic-ray-driven dynamo 
    Kulpa-Dybeł, K.; Otmianowska-Mazur, Katarzyna; Kulesza-Żydzik, Barbara; Kowal, Grzegorz; Hanasz, Michał; Wóltański, Dominik; Kowalik, Kacper (2011-06-01)
    We present three-dimensional global numerical simulations of the cosmic-ray (CR) driven dynamo in barred galaxies. We study the evolution of the interstellar medium of the barred galaxy in the presence of non-axisymmetric ...
  • Resistive MHD simulations of the Parker instability in galactic disks 
    Kowal, Grzegorz; Hanasz, Michał; Otmianowska-Mazur, Katarzyna (2003-04-11)
    Parker instability leads to the formation of tangential discontinuities in a magnetic field and subsequent magnetic reconnection due to a numerical and/or an explicit resistivity. In this paper we investigate the role of ...