Intermittent behavior of galactic dynamo activities

Abstract

view Abstract Citations (43) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Intermittent Behavior of Galactic Dynamo Activities Ko, C. M. ; Parker, E. N. Abstract Recent observations by Beck and Golla of far-infrared and radio continuum emission from nearby spiral galaxies suggest that the galactic magnetic field strength is connected to the current star formation rate. The role of star formation on the generation of large-scale galactic magnetic field is studied in this paper. Using a simple galactic model, it is shown how the galactic dynamo depends strongly on the turbulent velocity of the interstellar medium. When the star formation efficiency is high, the ISM is churned which in turn amplifies the galactic magnetic field. Between active star formation epochs, the magnetic field is in dormant state and decays at a negligible rate. If density waves trigger star formation, then they also turn on the otherwise dormant dynamo. Publication: The Astrophysical Journal Pub Date: June 1989 DOI: 10.1086/167540 Bibcode: 1989ApJ...341..828K Keywords: Astronomical Models; Dynamo Theory; Interstellar Magnetic Fields; Interstellar Matter; Spiral Galaxies; Magnetic Field Configurations; Magnetic Flux; Star Formation Rate; Astrophysics; HYDROMAGNETICS; INTERSTELLAR: MAGNETIC FIELDS; STARS: FORMATION full text sources ADS | data products SIMBAD (4)