R. F. Haynes

Supernova remnants with jets

Two examples are given of probable radio jet/supernova remnant associations: G332.4+0·1 and G 315 ·8 - O· O. In both cases the jet length is larger than the radius of the remnants shell, and the jet diameter is barely resolved and substantially less than the observed shell thickness. The jet luminosity is 5-10% that of the shell. The G332·4 +0.1 jet terminates in an extended plume whose luminosity is about 50% that of the shell.

5000 MHz flux densities and spectra for 325 small-diameter radio sources at low galactic latitudes

Flux density measurements at 5000 MHz are presented for 325 of the small-diameter sources detected in the Molonglo 408 MHz galactic survey. By investigating the spectra we show that probably between 10 % and 15 % of the sources are galactic and the remainder extragalactic.

CirX-1 revisited: 843 MHz observations of CirX-1 and G321:G79—0:G73

New high-sensitivity results at 843 MHz are presented for the Circinus X-I (Cir X-I) and SNR G 3 21 ·9 - 0 . 3 regions. We summarise current observational data for Cir X-I and discuss appropriate models.

Synthesis surveys of southern supernova remnants

A report is presented detailing observations of supernova remnants (SNRs) with the Fleurs and Molonglo synthesis radio telescopes. Fifty-four remnants have been mapped with at least one of these instruments, eleven with both. Approximately half of the maps have been published and a key to these publications is given.

Weak OH Masers in the Direction of H20 Masers

Most of the known 1.35 cm water vapour masers have been detected in the direction of known 18 cm OH masers. However, a small number have been found in the direction of HII regions where no OH maser is known. Several new examples of H20 masers with no known OH counterparts have recently been published by Kaufmann et d. (1976), who suggest that these constitute a new class of H20 maser.