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Journal of Physical Studies 17(4), Article 4901 [10 pages] (2013)
DOI: https://doi.org/10.30970/jps.17.4901 THE ROLE OF DUST IN MODELLING THE HII REGION EMISSION WITH BUBBLE-LIKE STRUCTURE INSIDEI. O. Koshmak, B. Ya. Melekh
Department for Astrophysics, Ivan Franko National University of Lviv |
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The method of multicomponential photoionization modelling of the H{\sc ii} region surrounding the starburst knot is presented. Radial distributions of the gas density, the velocity of motion of gas shells and the temperature in the internal components of the bubble (the region of free expansion superwind and the cavity) were obtained using the model suggested in Weaver et al. (1977). The outer components of our models describe a thin shell of high density formed by the superwind shock from the surrounding gas, and a typical (undisturbed by the superwind) H{\sc ii} region. The spectra of the ionizing radiation were obtained from the previously calculated evolutionary models of the typical starbursts. The two evolutionary grids of the multicomponential models with different bubble parameters (without dust and, correspondingly, with dust grains) were calculated. A comparative analysis of the calculation results was carried out. More specifically, the influenсe of the presence of the bubble inside the H{\sc ii} region (in the models with dust and those without it) on the change of the ionizing spectrum shape as well as on the formation of the radiation fluxes in important emission lines and diagnostic ratios was analysed.
PACS number(s): 98.58.Hf, 98.52.Wz, 98.54.Ep, 98.56.Wm