The wavelength dependence of Sgr A* size and the unified model of compact radio sources

2002/10/24 by F. V. Prigara, Fedor Prigara
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Star Formation Studies #Field (mathematics) #Magnetic field #Maser #Pulsars and Gravitational Waves Research #Radio wave #Thermal #Unification #Unified Model #Wavelength #astro-ph

paper · pdf · doi:10.1002/asna.200385112

published in Astronomische Nachrichten 324(S1), 425-429 (Wiley) · 8 pages

arxiv created 2002/10/24 · openalex publication_date 2003/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Using, in particular, the data for Sgr A*, we propose a unified model of compact radio sources, i.e. of pulsars, maser sources, and active galactic nuclei. The unification is based on the wavelength dependence of radio source size. It is shown that the compact sources are characterized by a maser amplification of thermal radio emission. The density, temperature, and magnetic field profiles of compact sources are discussed. The wavelength dependence of Sgr A*'s size is explained by the effect of the gravitational field of a central energy source on a gas flow.

Citations

• Space VLBI Observations Show [ITAL]T[/ITAL][TINF][ITAL]b[/ITAL][/TINF] ] 10[TSUP]12[/TSUP] K in the Quasar NRAO 530
• Radio profile instability in the millisecond pulsar PSR J0437−4715 resulting from spiky emission
• The Origin of Radio Emission in Low-Luminosity Active Galactic Nuclei: Jets, Accretion Flows, or Both?
• An analysis of the observed radio emission from planetary nebulae