Past events

List of past events.

19
Sep
2023
12
Sep
2023
05
Sep
2023

Colloquium: Courtney Crawford (University of Sydney) "Hydrogen Deficient Carbon Stars - What happens after a white dwarf merger?" ...

11am 5 September 2023

Hydrogen deficient carbon (HdC) stars are a rare class of supergiant variable star with less than 1% hydrogen by mass. They exhibit a wealth of exotic characteristics such as production of dust, carbon-rich atmospheres, anomalous isotopic ratios, and very low metallicities. The most likely explanation for their formation is via a low-mass white dwarf merger, namely a CO-WD + He-WD merger. In this talk I will present the evidence that we see for this exotic formation mechanism, such as the oxygen isotopic ratio, our efforts in stellar modelling, and population synthesis modelling. I will also provide an overview of their unique characteristics and pathways for current work on them, especially regarding dust production, variability, and our current understanding of their kinematics using Gaia data.

22
Aug
2023

Colloquium: Joss Bland-Hawthorn (U. Sydney) "Do baryons dominate the centres of high-redshift galaxies?" »

11am 22 August 2023

NFW would have us believe that dark matter dominates the centres of galaxies, but this has never been observed in massive galaxies, and certainly not in the Milky Way and M31 where baryons dominate out to at least 10 kpc in radius. So what about early galaxies? Can we find NFW cusps here that were subsequently wiped out? This is looking increasingly unlikely as well -- baryons may have always dominated the inner parts of galaxies. I will examine implications of baryon domination that will be testable with JWST deep fields (e.g. JADES) in the coming months.

22
Aug
2023

RSAA Colloquium - Professor Joss Bland-Hawthorn »

11am 22 August 2023

Title: Do baryons dominate the centres of high-redshift galaxies?

17
Aug
2023

RSAA-CGA Joint Seminar - Andjelka Kovačević »

11am 17 August 2023

"Unraveling close binary supermassive black holes: Interplay of time-domain observations and simulations"

15
Aug
2023

RSAA Colloquium - Professor Kinwah Wu (University College London) »

11am 15 August 2023

Details provided shortly.

10
Aug
2023

End of Thesis talk - Zefeng Li (RSAA) »

11am 10 August 2023

Title: Metallicity correlations in galaxies

08
Aug
2023

RSAA Seminar - A/Prof. Shunsaku Horiuchi (Virginia Tech) »

11am 8 August 2023

Towards the discovery of diffuse supernova neutrinos.

Pages