Planetary nebulae near the Galactic center. II - The second VLA measurements

Details Planetary nebulae near the Galactic center. II - The second VLA measurements Planetary nebulae near the Galactic center. II - The second VLA measurements

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..181r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 181-189.

Astronomy and Astrophysics

Astronomy

49

Galactic Structure, Infrared Radiation, Interstellar Matter, Planetary Nebulae, Radio Emission, Infrared Astronomy Satellite, Optical Measurement, Radio Telescopes, Very Large Array (Vla)

Scientific paper

Radio measurements using the VLA on newly discovered PNe within 15 deg from the Galactic center are reported in a continuation from a previous paper. The sample of new Galactic bulge PNe is increased by adding 48 PNe, which are listed and described. Six optically known PNe were also detected in the fields and are briefly discussed. The findings strengthen the conclusion that on the average the newly discovered nebulae have IR excesses (IREs) higher than the nearby nebulae. The presence of a strong correlation between IRE and nebular age in the nearby nebulae suggests that the known bulge nebulae are generally younger than the nearby ones and on average the newly discovered nebulae are even younger. Possible causes for this are the disruption of nebulae at a younger age in the bulge due to the higher density ISM combined with the very high velocity dispersion and the presence of a strong interstellar radiation field.

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