Six-cm Radio Radiation from Planetary Nebulae.

Abstract

view Abstract Citations References (1) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Six-cm Radio Radiation from Planetary Nebulae. Kaftan-Kassim, Mae A. Abstract Flux density measurements of Planetary nebulae at 6 cm have been made at the Xational Radio Astronomy Observatory using the 140-ft radio telescope at Green Bank. Sixty planetary nebulae were detected, the limit of detection being 0.05 flux units (one flux unit= 10-26 W m-2 Hz-'). The 6-cm fluxes are combined with measurements at other wavelengths made both at Green Bank and elsewhere and the resulting spectra are discussed. Most objects exhibit a thermal spectrum. Five objects show possible nonthermal spectra. These may be explained by possible chance coincidences. One of these, however, XGC 40, seems to consist of a thermal plus a nonthermal source, the latter slightly removed in position, similar to the sources observed near XGC 3242 (M. A. Kaftan-Kassim, Astrophys. J. 145, 658, 1966). There are other observations that indicate that a few other planetary nebulae have such companion non thermal sources (KaftanKassim, to be published). Analysis of further records as well as the securing of more observations will decide whether or not this is a true physical association or a mere chance coincidence. Publication: The Astronomical Journal Pub Date: October 1967 DOI: 10.1086/110499 Bibcode: 1967AJ.....72R.807K full text sources ADS |