TBD

Ashwathi Nair DTR

MCR review

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Over the last 2 years, independent teams have found building evidence for time-varying dark energy, at a ~4 sigma tension with Lambda-CDM cosmology. However, these findings may be a result of systematics in the archival low redshift SN samples that provide an anchor to the Hubble Diagram in these studies. Using DECam on the 4m Blanco telescope in Chile and WiFeS on the ANU 2.3m telescope, we are completing the Dark Energy Bedrock All-Sky Supernova (DEBASS) survey, a sample of 500 low redshift SNe Ia that will replace this historic anchor, allowing us to verify the time-varying nature of dark energy. We present the initial findings of DEBASS, and results from the concurrent WiFeS follow-up of SN host galaxies from both the Foundation and DEBASS samples. This work demonstrates that the canonical “Mass Step” correction to SN Ia distance moduli poorly represents the systematic impact of a SN Ia’s host galaxy, suggesting the use of [OII] equivalent width as a more robust standardisation parameter.

https://swinburne.zoom.us/j/756407223?pwd=RHk2TEF2MFZJZDNhL1FwckxDUUpSZz09
Meeting ID: 756 407 223 
Password: 059918

Disentangling the interplay between star formation and nuclear activity is key to understanding how active galactic nuclei (AGN) shape galaxy evolution. We apply unsupervised machine-learning clustering to multiwavelength (optical, infrared, and radio) AGN diagnostics to quantify the fractional energy contributions from these processes in radio-detected galaxies. Using data from the GAMA G09 and G23 fields, the Evolutionary Map of the Universe (EMU), and WISE, our method recovers ~90% of star-forming galaxies and ~80% of the AGN identified by traditional diagnostics. We introduce a new IR-radio diagnostic that selects radio AGN with ~90% reliability, and a three-dimensional diagnostic (W1-W2 colour, W2 magnitude, 1.4 GHz flux density) that achieves ~90% completeness and reliability. Finally, we present a probabilistic EMU catalogue assigning fractional AGN and star-formation activity across optical, IR, and radio regimes. Our results support a fractional, data-driven view of galaxy activity, providing new tools to trace AGN-galaxy coevolution in the era of EMU and the SKA.

TBC

The Sun is a natural laboratory for testing plasma physics theories and models of astrophysical systems. Using multi-wavelength (and sometimes multi-messenger) observations, we can observe plasma physics processes such as magnetic reconnection, waves and instabilities, magnetoconvection, plasma heating, particle acceleration, solar/stellar wind acceleration and much more. This talk will give a primer on how we use observations and radiative magnetohydrodynamics (MHD) simulations to study such physical processes, and implications for our understanding of other astrophysical objects.

Tyson Dial DTR: "Searching for Fast Radio Bursts with ASKAP"

The CRISTAL survey explores how typical galaxies formed and evolved when the Universe was only one billion years old. By combining high-resolution ALMA observations of gas and dust with JWST and HST imaging of stars and young stellar regions, CRISTAL provides one of the most detailed views to date of the internal structure of early star-forming galaxies (Herrera-Camus et al. 2025).


These galaxies display a wide range of morphologies –from rotating disks to interacting systems and clumpy star formation– and often show gas emission extending beyond the stellar light. The survey reveals how gas, dust, and stars are connected during the rapid growth phase of galaxies at high redshift. With JWST/NIRSpec, we are now tracing the ionized gas and young stellar populations, gaining a comprehensive view of how galaxies build up their mass and structure during the Universe’s first billion years.

Marco will give his CoC talk.

TBD

Jay Smallwood CoC: "Phased Array Feed Signal Processing"

https://swinburne.zoom.us/j/82316663764?pwd=x2N8fSq0zYPIRYrroXoNQhab4CtiJy.1&jst=2

manual info:
Meeting ID: 823 1666 3764
Password: 003776