4 citations · 7 across the 3 of their papers we have counts for
6 papers · 1 filter
First results from the ATCA 18 GHz pilot survey
R. Ricci, E. M. Sadler, R. D. Ekers +7
As a pilot study for the first all-sky radio survey at short wavelengths, we have observed 1216 sq. deg. of the southern sky at 18GHz (16mm) using a novel wide-band (3.4GHz bandwid…
Measuring transverse velocities in gravitationally lensed extragalactic systems using an annual parallax effect
Artem V. Tuntsov, Mark A. Walker, Geraint F. Lewis
A parallax method to determine transverse velocity in a gravitationally lensed system is described. Using the annual motion of the Earth around the Sun allows us to probe the local…
Microwave anisotropies from the Galactic halo
Mark Walker, Michiko Ohishi, Masaki Mori
Models in which a large fraction of the Galactic dark matter takes the form of cold gas clouds imply that there is thermal microwave emission from the Galactic dark halo. Such mode…
Nanoarcsecond single-dish imaging of the Vela pulsar
J. -P. Macquart, S. Johnston, M. Walker +1
We have measured the properties of the diffractive scintillation toward the Vela pulsar under the extremely strong scattering conditions encountered at 660 MHz. We obtain a decorre…
Extreme scattering of pulsars
Mark A. Walker
Extreme Scattering Events are radio-wave lensing events caused by AU-sized concentrations of ionised gas. Although they were discovered more than a decade ago we still have no clea…
Luminous "Dark" Halos
Mark A. Walker
Several lines of evidence suggest that cold, dense gas clouds make a substantial contribution to the total mass of dark halos. If so then physical collisions between clouds must oc…