iiinova — where your digital self keeps evolving

Stefan Duchesne @sunmish.bsky.social · 20/02/2026

We have recently published the 300-MHz component of the GaLactic and Extragalactic All-sky MWA survey (GLEAM-300), with 338k sources covering the sky up to declination +40 deg, with ~120" angular resolution and ~9 mJy/beam noise. The description paper is published via PASA: doi.org/10.1017/pasa....

An image of the radio galaxy Fornax A and its surroundings at 300 MHz.

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Reposted by Stefan Duchesne

A/Prof Natasha Hurley-Walker @colourfulcosmos.bsky.social · 29/10/2025

Today in PASA we published a new image of our Milky Way at low radio frequencies, in unprecedented colour and detail. Here's just a tiny piece of it -- the whole thing is ten times bigger! We're seeing high energy electrons whirl around cosmic magnetic fields from exploded stars, and more!

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Reposted by Stefan Duchesne

Publications of the Astronomical Society of Australia @pasajournal.bsky.social · 19/06/2025

Recently published in PASA: "The Polarisation Sky Survey of the Universe’s Magnetism (POSSUM): Science Goals and Survey Description", Gaensler, B.M. et al. This is Figure 1. To read the paper visit doi.org/10.1017/pasa...

Comparison of NVSS (left; Taylor et al., 2009) and POSSUM (right) Band 1 RMs within the Fornax cluster’s virial radius (grey dashed circle), showcasing POSSUM’s transformative capability to probe magnetised gas in clusters, groups, and many other ∼degree-scale extragalactic objects. The background is a Digitized Sky Survey optical image (greyscale). Solid circles indicate the position, magnitude, and sign of RMs measured by each survey, with diameters proportional to (RM)^2 and colours indicating RM sign (red for positive, blue for negative). While only a few clusters or groups contain >∼ 10 NVSS RMs at sub-virial radii, POSSUM’s RM grid will sample thousands of these systems, including over a dozen with 100 or more RMs.

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Stefan Duchesne @sunmish.bsky.social · 08/03/2025

Some bougainvillea in the garden. After 13 years of use, I've finally replaced my trusty Canon 1000D - still using the same 60mm and 50mm lenses (for now), but the new camera is a very nice upgrade.

Close-up view of white bougainvillea with some small flowers poking through the bracts.

Magenta bougainvillea with small white flowers. More bougainvillea leaves and flowers are out of focus in the background.

A close-up of a magenta bougainvillea, with its small white flowers hiding under a green leaf.

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Stefan Duchesne @sunmish.bsky.social · 10/01/2025

The latest data release for the Rapid ASKAP Continuum Survey (RACS), this time at 1655.5 MHz. Here's the paper describing the RACS-high images and catalogue. You can find links to the data products in the paper: arxiv.org/abs/2501.04978

arxiv.org

The Rapid ASKAP Continuum Survey (RACS) VI: The RACS-high 1655.5 MHz images and catalogue

We have conducted a widefield, wideband, snapshot survey using the Australian SKA Pathfinder (ASKAP) referred to as the Rapid ASKAP Continuum Survey (RACS). RACS covers $\approx$ 90% of the sky, with ...

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