The appearance of dusty H II blisters at radio and infrared wavelengths
V. Icke, I. Gatley, F. P. Israel;
ApJ, 1980, 236, 808
ABSTRACT:Detailed calculations for the observational appearance of nonspherical Stromgren regions at radio and infrared wavelengths are
presented.
The computations are made feasible by two assumptions, namely (1) no
stellar photon leaves the solid angle within which it was emitted, and (2) the
radiation spectrum can be represented by three delta functions corresponding to
Lyman continuum, Lyman alpha, and softer radiation.
These calculations
are used to develop models for the H II blisters M17 A and 30 Doradus, and also
first order parameters for a sample of other well-studied galactic H II
regions.
It is concluded that the observations are well explained by an ionizing
object in a density gradient, without the need for peculiar dust properties or
distribution.
KEYWORDS: infrared radiation, interstellar matter, nebulae, radio sources (astronomy), cosmic dust, delta function, h ii regions, hydrogen ions, interstellar radiation, lyman alpha radiation
PERSOKEY:region hii, ,
CODE: icke80