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4th of December 2015
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.

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