A radio search for planetary nebulae near the galactic center. III - VLA and optical observations of three objects

Details A radio search for planetary nebulae near the galactic center. III - VLA and optical observations of three objects A radio search for planetary nebulae near the galactic center. III - VLA and optical observations of three objects

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....86..254i&link_type=abstract

Astronomy and Astrophysics, vol. 86, no. 1-2, June 1980, p. 254-258.

Astronomy and Astrophysics

Astronomy

12

Centimeter Waves, Extragalactic Radio Sources, Galactic Nuclei, Planetary Nebulae, Radio Astronomy, Astronomical Maps, Continuous Spectra, H Ii Regions, Radio Spectra, Very Large Array (Vla)

Scientific paper

Radio observations of three flat-spectrum sources detected in the Westerbork search at 21 and 6 cm for planetary nebulae near the galactic center are reported. The objects 19W 109, 19W 43 and 19W 32 were reobserved at 6 cm with the NRAO Very Large Array in an attempt to discern structure that would identify them as planetary nebulae. 19 W109 is observed to be a point source by the VLA, indicating its more probable nature as a flat-spectrum extragalactic source or a compact H II region. 19W 43 exhibits a double structure and can be fit to a uniform-density shell model with an inner angular radius of 0.4 arcsec and an outer radius of 0.7 arcsec, suggesting a planetary nebular near the galactic center. Observations of H alpha and O III emission in addition to the radio continuum from 19W 32 indicate it to be a planetary nebula; however, its size and reddening are inconsistent with a galactic center location.

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