1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1417
Full metadata record
DC FieldValueLanguage
dc.contributor.authorKantharia, N.G.-
dc.contributor.authorAnantharamaiah, K.R.-
dc.contributor.authorGoss, W.M.-
dc.date.accessioned2006-07-07T06:35:19Z-
dc.date.available2006-07-07T06:35:19Z-
dc.date.issued1998-09-01-
dc.identifier.citationAstrophysical Journal, 1998, Vol.504, p.375-389en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/1417-
dc.description.abstractWe present high-sensitivity, high-resolution VLA observations of the W3 complex of H II regions in the 168 alpha recombination lines of hydrogen, carbon, and sulphur. The H 168 alpha line from W3A consists of two components: a broad line (width ~27 km s-1) and a narrow line (width ~7 km s-1). The narrow hydrogen and carbon line emissions over W3A, although overlapping, are not entirely coextensive. The carbon line is possibly correlated with the molecular gas near W3A. Stimulated emission is the main mechanism for the narrow hydrogen line emission. The width of the H0 line gives an upper limit of ~1000 K for the electron temperature of the partially ionized gas. The electron density ranges from 10 to 80 cm-3 in the narrow hydrogen line region and from 10 to 60 cm-3 in the carbon-line region. We determined the electron temperature of the classical H II region W3A from the continuum brightness to be ~9000 K. The rms ne of this H II region is ~2200 cm-3, and the true ne, determined from a pressure-broadened profile of the H 171 eta (8.6 GHz) line, is ~2 x 104 cm-3. Using these two values of electron densities, we determine a lower limit to the filling factor (0.01). Such a low value can be interpreted as an effect of density inhomogeneities in the medium.en
dc.format.extent2702247 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://dx.doi.org/10.1086/306070en
dc.rights(1998) by the American Astronomical Society.en
dc.subjectISM: H II REGIONS,en
dc.subjectISM: INDIVIDUAL ALPHANUMERIC: W3Aen
dc.subjectLINE: PROFILESen
dc.subjectRADIO LINES: ISMen
dc.titleVLA observations of hydrogen and carbon recombination lines toward W3A at 1.4 GHz.en
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
1998 APJ V504 p375.pdf15p.2.64 MBAdobe PDFView/Open
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.