Pilot Observations for MALT-45: A Galactic Plane Survey at 7mm
  We introduce the MALT-45 (Millimetre Astronomer's Legacy Team - 45 GHz)
Galactic plane survey and describe pilot survey results with the Australia
Telescope Compact Array (ATCA). The pilot survey was conducted to test the
instrumentation and observational technique of MALT-45, before commencing the
full survey. We mapped two half-square degree regions within the southern
Galactic plane around the G333 giant molecular cloud, using fast mosaic
mapping. Using the new Compact Array Broadband Backend (CABB) on the ATCA, we
were able to observe two 2048 MHz spectral windows, centred on frequencies 43.2
and 48.2 GHz. Although only a coarse spectral resolution of around 7 km/s was
available to us, we detect widespread, extended emission in the CS (1-0) ground
state transition. We also detect eight Class I CH3OH masers at 44 GHz and three
SiO masers in vibrationally excited (1-0) transitions. We also detect the H53a
radio recombination line, non-vibrationally excited SiO (1-0) and emission in
the CH3OH 1_1-0_0 A+ line.
