Kinematics and electron temperatures in Orion A Virtual Observatory Resource

Authors
  1. Wilson T.L.
  2. Filges L.
  3. Codella C.
  4. Reich W.
  5. Reich P.
  6. Published by
    CDS
Abstract

A map of the core of Orion A, with a 42" resolution in the 64{alpha} recombination line of hydrogen, covering ~5' by ~5', is presented. The V_lsr_ distribution shows a complex variation about the center of the ionized gas emission: From {DELTA}{alpha}=-200" to +300", the V_lsr_ varies from -5km/s to +2km/s then to -4km/s, finally rising to +3km/s. A search for cold (T_e_~3000K) ionized gas toward the KL nebula has revealed no measurable differences in T_e_ between this region and other parts of Orion A. The average T_e_ from our data is 8300+/-200K. We find no significant difference between T_e_ values determined from radio recombination lines and those determined from forbidden optical lines of [O III], although the T_e_ value from Balmer decrement data is markedly lower. The turbulent velocity varies by <5% over the region mapped. On the basis of our 2.45' resolution, high dynamic range 6cm continuum map, we find that the emission falls off faster in the East than in the West. We find support for the model in which Orion A is ionization bounded in the East but density bounded in the West. The ionized gas in the West is flowing in the direction of the Sun, while the more positive V_lsr_ values in the east may be caused by the flow of ionized gas off the foreground Dark Bay. This ionized region may have little fine scale structure, since there is little continuum emission in interferometer maps.

Keywords
  1. h-ii-regions
  2. radial-velocity
  3. radio-astronomy
Bibliographic source Bibcode
1997A&A...327.1177W
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/327/1177
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/327/1177
Document Object Identifer DOI
doi:10.26093/cds/vizier.33271177

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History

1997-12-09T18:05:51Z
Resource record created
1997-12-09T17:05:55Z
Updated
1997-12-09T18:05:51Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr