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Issue A&A
Volume 373, Number 2, July II 2001
Page(s) 536 - 541
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20010306



A&A 373, 536-541 (2001)
DOI: 10.1051/0004-6361:20010306

Radio observations of new galactic bulge planetary nebulae

G. C. Van de Steene1, 2 and G. H. Jacoby3, 4

1  Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
2  Research School for Astronomy and Astrophysics, Private Bag P.O., Weston Creek, ACT 2611, Australia
3  National Optical Astronomical Observatories, PO Box 26732, Tucson, AZ 85726, USA
4  WIYN Observatory, PO Box 26732, Tucson, AZ 85726, USA

(Received 21 December 2000 / Accepted 27 February 2001)

Abstract
We observed 64 newly identified galactic bulge planetary nebulae in the radio continuum at 3 and 6 cm with the Australia Telescope Compact Array. We present their radio images, positions, flux densities, and angular sizes. The survey appears to have detected a larger ratio of more extended planetary nebulae with low surface brightness than in previous surveys. We calculated their distances according to Van de Steene & Zijlstra (1995). We find that most of the new sample is located on the near side around the galactic center and closer in than the previously known bulge PNe. Based on H$\alpha$ images and spectroscopic data, we calculated the total H$\alpha$ flux. We compare this flux value with the radio flux density and derive the extinction. We confirm that the distribution of the extinction values around the galactic center rises toward the center, as expected.


Key words: planetary nebulae: general -- galaxy bulge continuum: stars -- galaxy: stellar content radio

Offprint request: G. C. Van de Steene, gsteene@oma.be

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