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Blog

Filtering by Tag: distance measures

"Using host galaxy spectroscopy to explore systematics in the standardization of Type Ia supernovae" - Dixon et al. (2022)

Alan Duffy

Our Universe is expanding, and indeed accelerating in that expansion, and primary means to that discovery last century was measuring the apparent brightness of exploding stars known as supernovae. A special kind of supernova explodes at (almost!) the same brightness, known as Type 1a, and hence if you measure that brightness you can figure out how far away they are relative to each other. My student Mitchell Dixon published an exhaustive analysis of how to better calibrate that brightness of the Type 1a supernovae, in particular showing that they depended on the dust in the galaxy (slightly dimming them, or else perhaps causing a slightly different explosion brightness).

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"Gaia EDR3 bright star parallax zero-point using stellar clusters" - Flynn et al. (2021)

Alan Duffy

he incredible Gaia spacecraft has been monitoring the almost imperceptible drift of the stars in our Milky Way for the last decade, allowing us to measure their exact 3D position using the powerful parallax method. Yet even these measures can be improved in time as this work by Swinburne’s Dr Chris Flynn shows.

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