There’s Life in H Ii Regions Yet!
نویسندگان
چکیده
We give an overview of the literature on ionization front structure and propagation and comment on recombination front structures. We discuss the formation of cometary tails by photoionization of globules and note the importance of including the diffuse component of the ionizing radiation field. We finally briefly comment on the formation of small scale structures in H II regions.
منابع مشابه
Forage quality of three life forms of rangeland species in semi arid and semi humid regions in different phenological stages
For determination of grazing capacity, information of forage quality is essential which is influenced by various factors. The main objective of this research was investigation on effects of species, phenological stages, and life form on values of forage quality indices of six range species. Species were two grasses (Bromus tomentellus and Dactylis glomerata), two forbs (Ferula ovina and Coronil...
متن کاملULCERATIVE COLITIS AND HLA CLASS II PHENOTYPING IN IRAN
Ulcerative colitis (UC) is a nonspecific acute and chronic inflammatory bowel disease that diffusely involves the colonic mucosa. The etiology of UC has not yet been elucidated fully. However, many studies have found that immunologic disorders may play a role in the pathogenesis of UC. In addition, due to an increased frequency of UC in families, especially an increased monozygotic compared...
متن کاملMeasuring Mental Quality of Life of Citizens in Different Areas in Terms of Objective (Physical) Development; Case Study: districts no.:3, 6, and 9 in Mashhad
In this article, it has been tried to analyze the mental satisfaction of the quality of life in different regions in terms of objective development. For this purpose, districts no. 3, 6, and 9 of Mashhad city which through the measures of education, income, and employment were respectively among the deprived, the average, and the privileged regions were selected as the case study areas. Moreove...
متن کاملThe Molecular Properties of Galactic H Ii Regions
We derive the molecular properties for a sample of 301 Galactic H ii regions including 123 ultra compact (UC), 105 compact, and 73 diffuse nebulae. We analyze all sources within the BU-FCRAO Galactic Ring Survey (GRS) of CO emission known to be H ii regions based upon the presence of radio continuum and cm-wavelength radio recombination line emission. Unlike all previous large area coverage CO ...
متن کاملEntropy of Hybrid Censoring Schemes
A hybrid censoring scheme is a mixture of type I and type II censoring schemes. When $n$ items are placed on a life test, the experiment terminates under type I or type II hybrid censoring scheme if either a pre-fixed censoring time T or the rth (1<=r<=n is fixed) failure is first or later observed, respectively. In this paper, we investigate the decomposition of entropy in both hybrid cen...
متن کامل