Multicomponent simulation of emission of low-metallicity H II regions
Heading:
| 1Koshmak, IO, 1Melekh, BY 1Ivan Franko National University of Lviv, Lviv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2014, 30(2):26-47 |
| Start Page: Structure and Dynamics of the Galaxy |
| Language: Ukrainian |
Abstract: Using multicomponent photoionization simulation, we investigated the impact of bubble-like structures around starbursts inside low-metallicity H II regions on the ionization spectrum shape and on emission line forming. Radial distribution of density values and other physical parameters of bubble-like structures were taken from Weaver et al. [Weaver R. et al. Astrophys. J.—1977.—218.— P. 377]. The first and second inner components of such models describe the free expansion zone of superwind from the central starburst region and rarefied hot gas of the cavity thermalized by inverse shock wave, respectively. The gas density and electron temperature distributions into these components are obtained from the solution of the system of equations of continuity and energy transfer including heat conductivity. The third component is a thin shell of high density gas formed from the gas which surround a bubble by direct shock wind wave. The gas density in this component was obtained from isobaric condition at contact discontinuity between the second and third components. Input spectra of the ionizing radiation were obtained from the starburst evolutional models. The evolution grid of the multicomponent low-metallicity photoionization models with free parameters determining physical conditions inside bubble-like structure was calculated. The impact of bubble-like structure on the ionization spectrum shape and on the formation of fluxes of important emission lines in low-metallicity case was analysed in details. |
| Keywords: bubble-like structures, method, starburst |
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