22nd of June 2015 |
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Accurate HOPS water maser positions |
by Andrew Walsh (Curtin University) |
Accurate positions of water masers made
during HOPS, the H2O southern Galactic Plane Survey. This image
shows the position of just one water maser site from the catalogue of over
600 such sites identified with the Australia Telescope Compact Array (ATCA),
overlaid onto a 3-color GLIMPSE image (3.6, 4.5 and 8 micron). The accurate
positions allow us to see that the maser site is located right at the tip of
a nebula that is being actively destroyed by the very luminous star found
in the bottom-left corner of the GLIMPSE image. The inset shows the ATCA
spectrum of water maser emission, with eleven components spanning a velocity
range of over 100 km/s. Reference: Walsh, Purcell, Longmore, Breen, Green, Harvey-Smith, Jordan, Macpherson 2014, MNRAS 442, 2240 |