Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..359i&link_type=abstract
Astronomy and Astrophysics, vol. 81, no. 3, Jan. 1980, p. 359-362.
Astronomy and Astrophysics
Astronomy
9
Galactic Nuclei, Milky Way Galaxy, Planetary Nebulae, Radio Astronomy, Astronomical Models, Density Distribution, Galactic Bulge, Microwave Spectra, Optical Thickness, Radiant Flux Density
Scientific paper
A model of radio emission from planetary nebulae takes into account two possible evolutionary tracks of the central star. The results reproduce the solar neighborhood PN flux density distributions and suggest that PN are mostly optically thick. The latter point implies that the ionized mass of an individual nebula will often be much less than the total shell mass. Applying the model to the Westerbork search for galactic center planetaries, it is shown that detectability limitations allow about 5% of the bulge PN to be discovered via aperture synthesis. Selection effects arising from the detection threshold and radio evolution of planetaries will cause the detected sample to show a 21 cm flux density distribution with a maximum near 25 mJy. The flux distribution of 77 Westerbork sources shows an excess of 13 sources above the extragalactic background in this flux range. Preliminary 60-cm observations suggest that most of these are thermal; if planetaries, their birthrate in the galactic bulge is comparable to the solar neighborhood.
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