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28th of September 2015
Imaging techniques: the galaxy NGC 3621
by Bärbel Koribalski (CASS)
The three images above show the neutral hydrogen distribution (HI) of the spiral galaxy NGC 3621 using data from the Australia Telescope Compact Array (ATCA). The 15 baselines formed by the six 22-m ATCA antennas over a full synthesis are weighted differently to achieve a range of angular resolutions. While in "natural weighting" all baselines are weighted equally, higher resolution can be achieved by given more weight to the longer baselines. The 2015 Radio Synthesis School, held this week in Narrabri, will provide a wide overview of interferometric imaging techniques. - The galaxy NGC 3621 is part of the Local Volume HI Survey (LVHIS).

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