Cosmological evolution of large-scale magnetic fields in galaxies and the intergalactic medium

• Antragsteller: Dr. Rainer Beck
• Fachliche Zuordnung: Astrophysik und Astronomie
• Förderung: Förderung von 2009 bis 2010
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 126526691

• Erstellungsjahr: 2012

Zusammenfassung der Projektergebnisse

We developed an evolutionary model for magnetic fields in star-forming disk galaxies. We simulated the magnetic field distribution and computed maps of the total and polarized synchrotron emission and Faraday rotation measures for disk galaxies at various ages and for a wide range of radio frequencies. We used a standard dynamo model including the effect of star-formation by implementing a continuous injection of turbulent fields. Large-scale fields appear after 1-2 Gyr galaxy age. Long-lived large-scale field reversals may exist for certain model parameters. The predictions of our models can be tested with upcoming and future radio telescopes.

Projektbezogene Publikationen (Auswahl)

• (2009). Evolution of magnetic fields in galaxies and future observational tests with the Square Kilometre Array. Astronomy & Astrophysics, 494(1), 21-32
  Arshakian, T. G., Beck, R., Krause, M., & Sokoloff, D.
  
• 2009, in: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, eds. K.G. Strassmeier et al., p. 3
  Beck, R.
  
• 2009, Rev. Mex. AyA, 36, 1
  Beck, R.
  
• Magnetic fields in nearby galaxies: Prospects with future radio telescope. 2009, PoS(PRA2009)046
  Beck, R.
  
• (2010). Radio-optical scrutiny of compact AGN: correlations between properties of pc-scale jets and optical nuclear emission. Astronomy & Astrophysics, 520, A62
  Arshakian, T. G., Torrealba, J., Chavushyan, V. H., et al.
  
• (2010). Small-scale dynamo action during the formation of the first stars and galaxies-I. The ideal MHD limit. Astronomy & Astrophysics, 522, A115
  Schleicher, D. R. G., Banerjee, R., Sur, S., Arshakian, T. G., Beck, R., et al.
  
• 2010, Magnetism in Nearby Galaxies, Prospects with the SKA, and Synergies with the E-ELT, in: Astronomy with Megastructures. Joint Science with E-ELT and SKA, eds. I. Hook et al.
  Beck, R.
  
• Towards a New Era of Observing Cosmic Magnetic Fields. 2010, PoS(ISKAF2010)003
  Beck, R.
  
• (2011). Magnetic fields during primordial star formation
  Schleicher, D. R. G., Sur, S., Banerjee, R., Arshakian, T. G., Beck, R., et al.
  
• (2011). Modeling the total and polarized emission in evolving galaxies:“Spotty” magnetic structures. Astronomische Nachrichten, 332(5), 524-536
  Arshakian, T. G., Stepanov, R., Beck, R., Krause, M., & Sokoloff, D.
  
• (2011). Optimum frequency band for radio polarization observations. Monthly Notices of the Royal Astronomical Society, 418(4), 2336-2342
  Arshakian, T. G., & Beck, R.
  
• (2012). Radio-optical-gamma-ray properties of MOJAVE AGN detected by Fermi/LAT. Astronomy & Astrophysics, 537, A32
  Arshakian, T. G., Léon-Tavares, J., Böttcher, M., et al.