Mechanical Heating in Disk-Driven Winds – Thermal Structure & Observational Predictions
Source: Astrophysics and Space Science, Volume 287, Numbers 1-4, 2003 , pp. 129-134(6)
Abstract:Following the work of Garcia et al. (2001a) (GFCB), we compute the thermal properties and ionization structure of magnetically-driven disk winds. The original model's dominant heating function along the jet, ambipolar diffusion, is augmented by a mechanical heating term supposed to arise from weak shocks, as used by Shang et al. (2002). We add this mechanical heating function to a cold disk wind model and calculate its effect on the jet as a whole. The temperature and ionization of the flow are calculated in the case of cold jet solutions consistent with the underlying accretion disk (Ferreira, 1997). These solutions are compared to those of (GFCB) in order to quantitatively determine the effect of the mechanical heating on the flow. We then use the computed thermal and ionization structures to calculate jet synthetic observations. We find that the addition of mechanical heating leads to higher electron fractions, in turn leading to increased line fluxes and line ratios approaching observed values.
Document Type: Research Article
Affiliations: 1: Centro de Astrofísica da Universidade do Porto & Departamento de Matemática Aplicada da Faculdade de Ciêencias do Porto 2: Centro de Astrofísica da Universidade do Porto & Faculdade de Engenheria da Universidade do Porto 3: Laboratoire d'Astrophysique de Grenoble 4: Laboratoire d'Astrophysique de Grenoble & Observatoire de Paris 5: Instituto de Astronomía, Ciudad Universitaria, Mexico
Publication date: 2003-01-01