4th of December 2015 |
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Bolton Symposium talk |
by Helga Denes (CASS/ANU) |
We observe cold neutral atomic hydrogen (HI)
self absorption (HISA) clouds throughout our Galaxy against the background of
warmer HI emission. These HISA regions are ideal to measure the properties of
the cold neutral gas in our galaxy. The Riegel-Crutcher cloud is one of the
most famous HISA regions located in front of the Galactic centre. We measure
HI absorption against 56 continuum sources in the region to derive the optical
depth, the temperature and HI column densities. The continuum sources are
marked with circles, where the size of the symbols corresponds to the
brightness of the sources and the colour corresponds to the derived spin
temperatures of the gas in the Riegel-Crutcher cloud. Helga Denes presented this work at the 2015 Bolton & Student Symposium. |