ELSA: Euclid Legacy Science Advanced analysis tools

In Brera (Milan) to present how @elsa-euclid.bsky.social will use AI to study galaxies! @ec-euclid.bsky.social

Sky viewing tool with Euclid's Dark Cloud in the infrared on top of a ground-based visible image.

We followed up #ESAEuclid's near-infrared image of the Dark Cloud LDN 1641 with a comparison to the NIR 2MASS survey, and to a bespoke ground-based image in visible light.

Here's the comparison including a tool to experiment yourself:

www.euclid-ec.org/clouds-darkn...

#ESA #space #science 🔭

YouTube video by Euclid Consortium Infrared vs Optical: Euclid reveals what lies within and behind the Dark Cloud

Beautiful comparison of @ec-euclid.bsky.social's infrared view of an interstellar dark cloud, compared to what we see in optical light 🧪🔭 www.youtube.com/watch?v=MlmQ...

wow....

The solar flare that caused aurora here on Earth a few days ago, also caused a blizzard of particle impacts on @ec-euclid.bsky.social's detectors. Very nice explainer by @james4cet.bsky.social www.euclid-ec.org/here-comes-t... 🧪🔭

Anticipating Geomagnetic Storms: Reflections at the Halfway Point (Part 2) Keen AI and National Grid secure Ofgem funding to develop FoSMO, the UK’s first shared AI vision model to transform electricity network asset management.

Blog post by @ec-euclid.bsky.social PhD student Ruby Pearce-Casey from her #DISCnet industry placement with #KeenAI, deploing her AI skills to new areas. Earlier, Ruby made a breakthrough in finding strong gravitational lenses in Euclid imaging using machine learning keen-ai.com/blog/anticip... 🧪🔭

Anticipating Geomagnetic Storms: Reflections at the Halfway Point (Part 2) Keen AI and National Grid secure Ofgem funding to develop FoSMO, the UK’s first shared AI vision model to transform electricity network asset management.

Very nice blog post by my grad student Ruby Pearce-Casey (who's done excellent @ec-euclid.bsky.social work on finding strong gravitational lenses), from her #DISCnet industry placement with #KeenAI 🧪🔭 keen-ai.com/blog/anticip...

Let me tell you, our officially-not-an-X-ray-telescope #ESAEuclid did notice this flare. Very much so. A gazillion cosmic ray hits, plus a shadow of hardware where the instruments aren't fully X-ray shielded.

I mean this was the 39th (?) strongest flare in 30 years.

Whoa. The scale of this thing.

That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison.

It’s so very near that we live so close to a star and can watch its behaviour and activity.

A star and it’s just right there!

"Euclid's ability to cover such a large area of sky makes it a marvellous place to find rare objects that often could not be discovered in any other way. Euclid also doesn't just take images; its spectroscopic instrument also splits light up like a rainbow to diagnose how redshifted (how far away) each galaxy is and the conditions inside each galaxy. In this paper [Vergani et al] we used Euclid's spectroscopic instrument to unveil a population of rare galaxies with stronger ionizing radiation inside them, perhaps caused by a curious, unusual history of star formation that's assembling the stellar masses of galaxies. Unpicking this will be the subject of a lot of future research, and this is just the tip of the iceberg of the rare object discoveries awaiting us with Euclid."

Many other @ec-euclid.bsky.social papers being released this week, including by Daniela Vergani and team on discoveries of galaxies with unusual emission lines - here's an explainer by @stephenserjeant.bsky.social 🧪🔭

Many new @ec-euclid.bsky.social papers have just been released too, including this beautiful morphological tuning fork of galaxies 🔭🧪 This page is interactive - have a play! www.euclid-ec.org/euclid-morph...

Image taken by the Euclid space telescope of stars on a dark background, with wispy clumps in the foreground that comprise an infrared dark cloud, made visible via Euclid's infrared camera.

Some marvellous @ec-euclid.bsky.social press releases just out! A beautiful image of a shimmering infrared dark cloud observed with Euclid www.esa.int/ESA_Multimed...

Rather lovely blog marking the second anniversary of the launch of @ec-euclid.bsky.social, by @knudjahnke.bsky.social www.euclid-ec.org/second-anniv... 🔭🧪

Candidate Dark Galaxy-2: Validation and Analysis of an Almost Dark Galaxy in the Perseus Cluster Candidate Dark Galaxy-2 (CDG-2) is a potential dark galaxy consisting of four globular clusters (GCs) in the Perseus cluster, first identified in Li et al. (2025) through a sophisticated statistical m...

arXiv version of the paper: arxiv.org/abs/2506.15644

Candidate Dark Galaxy-2: U of T researchers shine new light on the universe’s darkest realms.

"Almost dark galaxy" discovered with the help of the @ec-euclid.bsky.social archive - press release in English 🧪🔭 www.statistics.utoronto.ca/news/candida...

Candidate Dark Galaxy-2: Validation and Analysis of an Almost Dark Galaxy in the Perseus Cluster - IOPscience Candidate Dark Galaxy-2: Validation and Analysis of an Almost Dark Galaxy in the Perseus Cluster, Li, Dayi (David), Liu, Qing, Eadie, Gwendolyn M., Abraham, Roberto G., Marleau, Francine R., Harris, William E., van Dokkum, Pieter, Romanowsky, Aaron J., Danieli, Shany, Brown, Patrick E., Stringer, Alex

Here's a link to the academic paper (free, open access): iopscience.iop.org/article/10.3...

„Dunkle Galaxie“ im Perseushaufen entdeckt Ein internationales Forschungsteam unter Beteiligung von Francine Marleau von der Universität Innsbruck hat eine nahezu unsichtbare Galaxie im Perseus-Galaxienhaufen identifiziert. Entdeckt wurde die ...

New Euclid archive result: discovery of an "almost dark galaxy" with four globular clusters. Wonderful to see the community make great use of the @ec-euclid.bsky.social archive! Press release (in German): 🔭🧪 www.uibk.ac.at/de/newsroom/...

Thank you :)

YouTube video by OpenLearn from The Open University Black Holes - 60 Second Adventures in Astronomy (12/14)

Black Holes www.youtube.com/watch?v=5p3k...

YouTube video by OpenLearn from The Open University Special Relativity - 60 Second Adventures in Astronomy (10/14)

Special Relativity www.youtube.com/watch?v=mU04...

YouTube video by OpenLearn from The Open University Dark Energy - 60 Second Adventures in Astronomy (9/14)

Dark Energy (featuring the @ec-euclid.bsky.social telescope) www.youtube.com/watch?v=7Yc2...

YouTube video by OpenLearn from The Open University Dark Matter - 60 Second Adventures in Astronomy (8/14)

Dark Matter (the stuff that creates most of the gravitational lensing signals seen by @ec-euclid.bsky.social )

www.youtube.com/watch?v=C8ZO...

YouTube video by OpenLearn from The Open University Supernovae - 60 Second Adventures in Astronomy (2/14)

Event horizons

www.youtube.com/watch?v=M7xT...

YouTube video by OpenLearn from The Open University Supernovae - 60 Second Adventures in Astronomy (2/14)

Supernovae (and watch for the scholarly pronounciation of the word by a history graduate, unlike that of astronomers)

www.youtube.com/watch?v=M7xT...

YouTube video by OpenLearn from The Open University The Big Bang - 60 Second Adventures in Astronomy (1/14)

A short 🧵 on some lovely Euclid-relevant Sixty Second Adventures, commissioned earlier by ELSA project members and narrated by the excellent David Mitchell 🧪🔭

The Big Bang:
www.youtube.com/watch?v=6bPL...

The mathematical poet Piet Hein wrote this lovely poem about Euclid, titled Parallelism 🧪🔭 /cc @ec-euclid.bsky.social

"Lines that are parallel
meet at Infinity!"
Euclid repeatedly,
heatedly,
urged.
Until he died
and so reaching that vicinity
in it he
found that the damned things diverged.

ELSA - Euclid (@elsa_euclid@mastodon.social) 59 Posts, 30 Following, 75 Followers · ELSA: Euclid Legacy Science Advanced analysis tools, pushing the boundaries of spectroscopy with the European Space Agency's Euclid space telescope

On the other microblogging site (no, not that one, the _other_ other microblogging site), the astrodon.social server is being decommissioned, so we've migrated our Mastodon account and moved most of its content over to mastodon.social/@elsa_euclid . Come and say hello! 🧪🔭

We're planning a citizen science project for volunteers to rummage the spectroscopic data from the ESA Euclid mission. Watch this space (metaphorically, and in time, literally) @science.esa.int @ec-euclid.bsky.social 🧪🔭

The DSS galaxy (a red blob)

The Euclid galaxy (you can now see arms! detail! it's amazing)

The new EULICD data release is AMAZING! 🔭

Here's a before / after of a random galaxy I found in one of the new images, comparing against the Digitized Sky Survey.

I highly recommend taking a look around on ESA Sky - it's fun! Link: sky.esa.int/esasky/?targ...

LEFT - Image description: A sea of stars and galaxies sparkle against a black background. Several galaxies can be identified by their elongated shape and/or spiral arms. Some galaxies are seen edge-on while one prominent spiral galaxy at the bottom centre is seen face-on. At the far right, between the middle and top of the image, are some interacting galaxies. Galaxy clusters are also seen, in particular near bottom centre, where features smeared into arcs represent gravitational lensing. The brightest stars in the image have diffraction spikes.]

RIGHT - Image description: A sea of stars and galaxies sparkle against a black background. Several galaxies can be identified by their elongated shape and/or spiral arms. Some galaxies are seen edge-on while one prominent spiral galaxy at the bottom centre is seen face-on. At the far right, between the middle and top of the image, are some interacting galaxies. Galaxy clusters are also seen, in particular near bottom centre, where features smeared into arcs represent gravitational lensing. The brightest stars in the image have diffraction spikes.]

Okay, we’re sorry…it’s a school night, we know…

But, stick with us, because we’ve got a case of the zoomies! 🔍

Here’s an area of Deep Field South zoomed in 16x 🌌 (1/3)