ELSA: Euclid Legacy Science Advanced analysis tools

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)

Galaxy Zoo featured in first Euclid data release! We’re delighted to share that Galaxy Zoo (and you!) are featured in the first Euclid data release announced today! Back in August 2024, we launched an intensive Euclid campaign where 9,976 of…

We’re delighted to share that Galaxy Zoo (and you!) are featured in the first Euclid data release announced today! Read more: blog.galaxyzoo.org/2025/03/19/g... 🔭

Thank you @ec-euclid.bsky.social consortium scientists for your hard work preparing these data & congratulations to all teams on the release, phenomena science productivity & innovative inclusion of nearly 10,000 citizen science volunteers in this exciting milestone @science.esa.int @esa.int

Direct links to #Euclid #ESASky:

Euclid Deep Field South: sky.esa.int/esasky/?hide...

Euclid Deep Field North: sky.esa.int/esasky/?hide...

Euclid Deep Field Fornax: sky.esa.int/esasky/?targ...

#astronomy #space @esa.int

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If you want to spend some quality time with #Euclid data, you can use "ESA Sky", which allows everyone to browse public data, pan, zoom, and look around. All in full colour galore, and full resolution.

#astronomy #space @esa.int

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The Open University

The @openuniversity.bsky.social has a nice news article on the @ec-euclid.bsky.social @eucliduk.bsky.social data release today, including some breakthrough work on lens discovery done by my grad student Ruby Pearce-Casey 🧪🔭 www.open.ac.uk/blogs/news/s...

Scientists hail ‘avalanche of discoveries’ from Euclid space telescope Data from European Space Agency’s mission has allowed researchers to create detailed catalogue of 380,000 galaxies

A nice write-up by @theguardian.com on the @ec-euclid.bsky.social data release, including some quotes on the avalanche of gravitational lenses by @stephenserjeant.bsky.social 🧪🔭 www.theguardian.com/science/2025...

Euclid opens data treasure trove, offers glimpse of deep fields On 19 March 2025, the European Space Agency’s Euclid mission released its first batch of survey data, including a preview of its deep fields. Here, hundreds of thousands of galaxies in different shape...

Big data release day! The first @ec-euclid.bsky.social data release is out now: www.esa.int/Science_Expl... And this is just the very start of Euclid's discovery adventure 🧪🔭

On a black background lies a rectangular shape with several stepped notches cut out of its corners, oriented with its longest edges running from bottom left to top right. Contained within the shape are more than ten million galaxies, and stars of various size, brightness and colour. Wispy faint blue cloud-like structures permeate the image, representing gas and dust in between the stars in our own galaxy.

On a black background lies a rectangular shape with several stepped notches cut out of its corners, oriented with its longest edges running from bottom left to top right. Contained within the shape are more than ten million galaxies, and stars of various size, brightness and colour. Wispy faint blue cloud-like structures permeate the image, representing gas and dust in between the stars in our own galaxy.

#ESAEuclid reveals its #Q1release data of three deep fields. In this image is a preview of Deep Field North.

Just to reiterate…this is Just. A. Preview.

But, in an area of sky equivalent to holding up an apple at arm’s length, Euclid has already seen more than 10 million galaxies! 😍 (1/4)

🧪🔭

Euclid finds an Einstein Ring What better way to start a cold February morning than with a lovely image from Euclid? The picture above on the left shows an image of the galaxy NGC 6505 and on the right a closer view of the cent…

telescoper.blog/2025/02/10/e...

🌌Einstein Ring Discovered by @esa.int's Euclid in galaxy NGC 6505 "just" 590 million light-years from Earth, which relatively speaking, is quite close! The newly discovered ring is made up of light from a previously unobserved galaxy 4.42 billion light-years away.

Watch this great explainer by one of our #EuclidUK scientists, @stephenserjeant.bsky.social ⬇️ 💍