Radio observations of new galactic bulge planetary nebulae^*

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

Corresponding author: G. C. Van de Steene, gsteene@oma.be

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 ([CITE]). 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 Hα images and spectroscopic data, we calculated the total Hα 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.