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Star formation in the inner galaxy: A far-infrared and radio study of two H2 regionsFar-infrared and radio continuum maps have been made of the central 6' of the inner-galaxy H II regions G30.8-0.0 (in the W43 complex) and G25.4-02., along with radio and molecular line measurements at selected positions. An effort is made to understand far infrared wavelingths allow the dust temperature structures and total far infrared fluxes to be determined. Comparison of the radio and infrared maps shows a close relationship between the ionized gas and the infrared-emitting material. There is evidence that parts of G30.8 are substantially affected by extinction, even at far-infrared wavelengths. For G25.4-0.2, the radio recombination line and CO line data permit resolution of the distance ambiguity for this source. The confusion in distance determination is found to result from an extraordinary near-superposition of two bright H II regions. Using revised distances of 4.3 kpc for G26.4SE and 12 kpc for G25.4NW, that the latter, which is apparently the fainter of the two sources, is actually the more luminous. Though it is not seen on the Palomar Sky Survey, G25.4SE is easily visible in the 9532A line of S III and is mapped in this line. The ratio of total luminosity to ionizing luminosity is very similar to that of H II regions in the solar circle. Assuming a coeval population of ionizing stars, a normal initial mass function is indicated.
Document ID
19860007769
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Lester, D. F. (Texas Univ. Austin, United States)
Dinerstein, H. L. (Texas Univ. Austin, United States)
Werner, M. W. (NASA Ames Research Center Moffett Field, CA, United States)
Harvey, P. M. (Texas Univ. Austin, United States)
Evans, N. J., II (Texas Univ. Austin, United States)
Brown, R. L. (National Radio Astronomy Observatory Charlottesville, Va., United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1985
Subject Category
Astronomy
Report/Patent Number
REPT-86008
NASA-TM-88184
PREPRINT-38
NAS 1.15:88184
Accession Number
86N17239
Funding Number(s)
PROJECT: RTOP 352-02-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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