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Journal of Physical Studies 11(3), 353–365 (2007)
DOI: https://doi.org/10.30970/jps.11.353 OPTIMIZED PHOTOIONIZATION MODELLING OF HII REGION IN BLUE COMPACT DWARF GALAXY SBS 0335-052B. Ya. Melekh
Ivan Franko National University of Lviv, Department for Astrophysics, |
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On the basis of the observed spectra obtained in [N. G. Guseva, Yu. I. Izotov, P. Papaderos, F. H. Chaffee, C. B. Foltz, R. F. Green, T. X. Thuan, J. Fricke, K. G. Noeske, Astron. Astrophys. {\bf 378}, 756 (2005)] using 10-m KeckII telescope from different apertures positioned along the Н{\sc ii} region in blue compact dwarf galaxy (BCDG) SBS 0335-052 the optimal cylindrical photoionization models (OPhMs) of the corresponding diffrent part of this object were found. The height and radius of every cylinder were defined by angular sizes of the apertures and Н{\sc ii} region, respectively, and by the distance to the object. The free parameters of OPhMs were: the radial hydrogen distribution into the corresponding cylinder, filling factor, energy distribution in the ionizing spectra (Lyc-spectrum) and relative abundances of the chemical elements. As a result the distributions of the physical charateristics and the chemical composition over radius of this Н{\sc ii} region were obtained. Because Lyc-spectra in OPhMs were found independently of the initial mass function (IMF) of the stellar ionizing cluster in this Н{\sc ii} region the parameters of IMF, characters and ages of the starburst in this galaxy were found on the basis of those obtained from OPhMs Lyc-spectra.
PACS number(s): 98.58.Hf, 98.52.Wz, 98.54.Ep, 98.56.Wm