The Expansion Rate and Distance to G5.89-0.39

Details The Expansion Rate and Distance to G5.89-0.39 The Expansion Rate and Distance to G5.89-0.39

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...495l.107a&link_type=abstract

Astrophysical Journal Letters v.495, p.L107

Astronomy and Astrophysics

Astronomy

36

Astrometry, Ism: H Ii Regions, Ism: Individual Alphanumeric: G5.89-0.39, Ism: Kinematics And Dynamics, Radio Continuum: Ism, Techniques: Interferometric

Scientific paper

The expansion rate of the ionized shell in the ultracompact H II region G5.89-0.39 has been measured using three VLA observations spanning 5.3 yr. The nebular shell is expanding at a rate of 2.5+/-0.5 mas yr-1. From the angular radius and expansion rate, we find a dynamical age of 600^{+250}_{-125} yr. Combined with a model for the nebular emission and H radio recombination line spectra, we estimate an expansion velocity of about 35 km s ^{-1} and a source distance of 2.0^{+0.7}_{-0.4} kpc. This is slightly closer than most previous estimates of 2.5-3 kpc. We see no evidence for northeast-southwest expansion that might be associated with the molecular outflow seen in SiO; however, our data are consistent with previous observations of a north-south flow, indicating that the SiO flow may originate from another young star along the line of sight.

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