#gravitational-lensing — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #gravitational-lensing, aggregated by home.social.
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Would you like to be part of citizen science astronomy? We invite you to classify gravitational lens candidates in so-far unreleased #ESAEuclid data: "Space Warps – ESA Euclid DR1".
3000 volunteers have already made nearly 900,000 classifications, yet 70% of the project are still to be done.
All the background and link to the Zooniverse: https://www.zooniverse.org/projects/aprajita/space-warps-esa-euclid
#ESA #Euclid #astronomy #GravitationalLensing #science #CitizenScience.
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What if gravity bends light like a cosmic magnifying glass?
Explore gravitational lensing here#Gravitationallensing #cosmology #physics #Einstein #universe
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ASTRONOMY MILESTONE: Scientists have solved the 'mass-distance degeneracy' problem, using #GravitationalLensing observed from Earth & the #Gaia space telescope to pinpoint a #RoguePlanet's exact mass & location. The Saturn-sized object, 9,785 light-years away, was likely violently ejected from its star system. This confirms theories of a vast, hidden population of nomadic planets & opens a new era for #Astronomy with upcoming telescopes like #nancygraceroman
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Astronomers spot 2 ‘time-warped’ supernovas whose light both has and hasn’t reached Earth
When you buy through links on our articles, Future and its syndication partners may earn a commission. The…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Space #ConorLarison #galaxycluster #ghostlyimages #gravitationallensing #HubbleSpaceTelescope #JamesWebbSpaceTelescope #multipleimages #Science #supernovas
https://www.newsbeep.com/us/442907/ -
AI Unlocks Hundreds of Cosmic Anomalies in Hubble Archive https://science.nasa.gov/missions/hubble/ai-unlocks-hundreds-of-cosmic-anomalies-in-hubble-archive/ #NASA #ArtificialIntelligenceAI #Astrophysics #AstrophysicsDivision #Galaxies #GoddardSpaceFlightCenter #GravitationalLensing #HubbleSpaceTelescope #IrregularGalaxies #OriginEvolutionOfTheUniverse #TheUniverse
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AI Unlocks Hundreds of Cosmic Anomalies in Hubble Archive https://science.nasa.gov/missions/hubble/ai-unlocks-hundreds-of-cosmic-anomalies-in-hubble-archive/ #NASA #Astrophysics #AstrophysicsDivision #Galaxies #GoddardSpaceFlightCenter #GravitationalLensing #HubbleSpaceTelescope #IrregularGalaxies #OriginEvolutionOfTheUniverse #TheUniverse
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R.I.P. Yannick Mellier (1958-2025)
Last night I received a message via the Euclid Consortium conveying the very sad news of the death, at the age of 67, of the French astrophysicist and cosmologist Yannick Mellier (pictured left). Among many other things, Yannick was the Euclid Consortium Lead in which role he took on enormous responsibility for getting the project started and, with his team, keeping everything running. His loss is incalculable.
Yannick’s research work focussed on cosmology and the search for dark matter using gravitational lensing. Back in 1987 he was part of the observational team that discovered the first giant arc produced by strong gravitational lensing. He also did pioneering work in the field of weaking gravitational lensing with the Canada-France Hawaii Telescope in that regard starting back in 2000.
For well over a decade now Yannick had been involved with the European Space Agency’s Euclid mission. He was a major force right from the beginning, making the proposal, and after it was accepted leading the Consortium assembled to bring the project into being, preparing for launch, and dealing with the first data. The Euclid Consortium is a huge collaboration and it is impossible to overestimate the scale of the task facing the Lead. The first full data release (DR1) from Euclid will take place towards the end of next year (2026). It is sad beyong words that he did not live to see this.
During the period when I was Chair of the Euclid Consortium Diversity Committee I had a number of interactions with Yannick, sometimes dealing with difficult and confidential matters. I found him to be a man of great wisdom and sensitivity. Despite having many other things to deal with, including a long-term illness, he was unfailingly supportive and his advice was always sound.
The following is an excerpt from the message sent out yesterday:
Yannick’s death leaves a huge void within the consortium and our community. Those of us who have been here the longest know how hard he worked to make the Euclid project a success. He became its embodiment, working tirelessly to ensure its success; we owe him an immense debt of gratitude, and we will surely have the opportunity to reflect in detail on all that we owe him.
Indeed. I hope the Euclid Consortium – and the international cosmological community generally – will, at some stage, organize an appropriate tribute to Yannick.
Rest in Peace, Yannick Mellier (1958-2025)
Ar dheis Dé go raibh a anam
#Cosmology #Euclid #EuclidConsortium #GravitationalLensing #YannickMellier
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Was interested in trying to make a black hole effect in Blender, and this is what I ended up with (just gravitational lensing, not a real black hole). It's not perfect, but I'm really happy with how it came out.
I achieved it with a set of 10 concentric spheres. Each one is textured with a dot product between the incoming camera ray and the normal to give a Fresnel-like effect with black at the boundary and white in the center, and then I use an exponent to intensify the effect (and make the borders very indistinct), and feed that into a refraction node.
The concentric spheres allow repeated refractions to give the lensing effect, and the indistinct boundaries stack nicely.
#Blender #Blender3D #Art #3DArt #BlackHole #GravitationalLensing #GravitationalLense
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Gravitational Lensing of 3I/ATLAS by the Sun - Avi Loeb – Medium
https://atlas.whatip.xyz/post.php?slug=gravitational-lensing-of-3iatlas-by-the-sun-avi-loeb-medium
"Unveiling the Cosmic Secrets: 3I/ATLAS' Gravitational Lensing Journey with Avi Loeb"
#space #astronomy #gravitationallensing #3iatlas #aviloeb -
Bullet Cluster (Webb and Chandra Compass Image) ✨
#Cosmology #GalaxyClusters #GravitationalLensing #Multiwavelength
⏩ 3 new pictures from Webb (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=5&user=OptimusPrimeBot&ilshowall=1&offset=20250701043453
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NASA’s Webb Reveals Galaxy Population Driving Cosmic Renovation ☀️✨
#Ast #Astrophysics #Galaxy #GalaxyCluster #GravitationalLensing #Reionization #SolarMagneticField #SolarMaximum
⏩ 2 new pictures and 1 new video from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=14&user=OptimusPrimeBot&ilshowall=1&offset=20250612130129
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Good and bad news: my first @youtube short was released today: https://youtube.com/shorts/410FgB0jWk0?si=C5jO7HTsPGimDkn0
good: I have more ideas what to do with this format.
bad: the AI-translation really s****. Anybody got an idea how to improve that? Doing it in English from the start sounds the most reasonable for me....#outreach #scicomm #astronomy #astrophysics #GravitationalLensing #Cosmology
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Incredible new #JWST deep field (120 hours!) released by folks from ESA/NASA Webb teams.
Not only is nearly everything in this image a galaxy (the two spiky stars are not), but those curved arcs are images of galaxies beyond this cluster, which are projected and warped into our view thanks to the power of gravity!
It's called a gravitational lens. To visualise what's happening, take a look at this diagram.
There are distant galaxies that we can't normally see. There's also a galaxies between them and us, with lots of mass.
This mass warps space-time and bends the distant galaxy light towards us so we see them.
I am amazed. You should be amazed. This is a really epic image.
Galaxy image and alt-text credit: ESA/Webb, NASA & CSA, H. Atek, M. Zamani (ESA/Webb)
Diagram credit: NASA, ESA & L. Calçada
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The KiDS Legacy
What with all the cosmological goings-on of the past couple of weeks – see here, here and here – I quite forgot to mention another important set of results. These are from the final data release Kilo-Degree Survey known as KiDS for short and represent a final analysis of the complete dataset. For those of you not in the know, KiDs is a weak lensing shear tomography survey and its core science drivers are to map the large scale matter distribution in the Universe and constrain the equation of state of Dark Energy. The results can be found in three papers on arXiv, which you can add to your reading list:
- KiDS-Legacy: Redshift distributions and their calibration (Wright et al.)
- KiDS-Legacy: Cosmological constraints from cosmic shear with the complete Kilo-Degree Survey (Wright et al.)
- KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes (Stölzner et al.)
As far as I’m concerned, the main result to leap out from the cosmological analysis, which primarily constrains the clumpiness of matter in the universe, expressed by the density parameter Ωm and a fluctuation amplitude σ8 in the combined parameter “S8“, which is constrained almost independently from Ωm. The value obtained for this parameter by KiDS has previously been “in tension” with values from other experiments (notably Planck) ; see here for a discussion. The new results, however, seem consistent with the standard cosmological model. Here is a figure from the last paper in the above list that illustrates the point:
As is often the case, there’s also one of those nice Cosmology Talks videos that discusses this and other aspects of the KiDS Legacy results to which I refer you for more details!
https://www.youtube.com/watch?v=PIQKe-tW1xQ
#arXiv250319440 #arXiv250319441 #arXiv250319442 #DarEnergy #GravitationalLensing #KIDS #KiloDegreeSurvey #KilodegreeSurvey #weakGravitationalLensing
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🚀 Discover the wonders of the universe! 🌌 Read my latest article on Gravitational Lensing and explore how space bends light in fascinating ways. 📖✨ Check it out now on my Blogger page! 🔗👉 https://sciencehub9123.blogspot.com/ and https://prasenjit912.blogspot.com/
📷 Stunning images included! Follow my page for more cosmic discoveries! 🚀🔭 #Space #Astrophysics #GravitationalLensing
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In case you missed it: The annual donation project of the @maxplanckgesellschaft supports a new research project at @mpi_grav in Potsdam. It will combine gravitational waves and gravitational lensing into a novel method for exploring the Universe.
ℹ️ https://www.aei.mpg.de/1227766/with-einstein-on-crooked-paths
ℹ️ https://www.mpg.de/annualproject2024
#ICYMI #Einstein #GravitationalWaves #GravitationalLensing #astrophysics #DarkMatter
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The annual donation project of the @maxplanckgesellschaft supports the search for gravitational waves deflected by gravity at @mpi_grav in Potsdam.
A new project will combine gravitational waves and gravitational lensing into a novel method for exploring the Universe.
ℹ️ https://www.aei.mpg.de/1227766/with-einstein-on-crooked-paths
ℹ️ https://www.mpg.de/annualproject2024
#Einstein #GravitationalWaves #GravitationalLensing #astrophysics #DarkMatter
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Five New Publications at the Open Journal of Astrophysics
Time for the usual Saturday summary of papers at the Open Journal of Astrophysics. We have published five more papers since the last update a week ago. The count in Volume 7 (2024) is now up to 119 and the total altogether to 234. As I mentioned in a post last week this means we have published more papers this year (2024) than in all previous years put together.
In chronological order, the five papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.
First one up, published on Wednesday 18th December 2024 is “The picasso gas model: Painting intracluster gas on gravity-only simulations” byby Florian Kéruzoré, L. E. Bleem, N. Frontiere, N. Krishnan, M. Buehlmann, J. D. Emberson, S. Habib, and P. Larsen all of the Argonne National Laboratory, USA. The paper, which is in the folder marked Cosmology and NonGalactic Astrophysics describes a method using machine learning based on an analytical gas model to predict properties of the intracluster medium.
Here is a screen grab of the overlay, which includes the abstract:
You can find the officially accepted version of the paper on the arXiv here.
The second paper to announce, and the first of four published on Wednesday 19th December 2024, “maria: A novel simulator for forecasting (sub-)mm observations” by J. van Marrewijk (ESO, Garching, Germany) and 10 others based in Germany, USA, Norway, France and Italy. This paper describes a multi-purpose telescope simulator that optimizes scanning strategies and instrument designs, produces synthetic time-ordered data, time streams, and maps from hydrodynamical simulations, thereby enabling comparison between theory and observations. This one is in the folder marked Instrumentation and Methods for Astrophysics.
You can see the overlay here:
The accepted version of this paper can be found on the arXiv here.
The third paper is “Detached Circumstellar Matter as an Explanation for Slowly-Rising Interacting Type Ibc Supernovae” by Yuki Takei (Kyoto U., Japan) & Daichi Tsuna (Caltech, USA). This one was also published on 19th December and is in the folder marked High-Energy Astrophysical Phenomena. The overlay is here:
The officially accepted version can be found on arXiv here.
The fourth paper, also published on 19th December 2024, is called “On the dark matter content of ultra-diffuse galaxies” and was written by Andrey Kravtsov (U. Chicago, USA). The article discusses the implications of measured velocity dispersions of ultra-diffuse galaxies for models of galaxy formation and is in the folder marked Astrophysics of Galaxies.
The overlay is here
You can find the officially accepted version of this paper here.
The fifth paper in this batch is “Estimating Exoplanet Mass using Machine Learning on Incomplete Datasets” by Florian Lalande (Okinawa Institute of Science and Technology), Elizabeth Tasker (Institute of Space and Astronautical Science, Kanagawa) and Kenji Doya (Okinawa); all based in Japan. This one was published on 10th October 2024 in the folder marked Earth and Planetary Astrophysics. It compares different methods for inferring exoplanet masses in catalogues with missing data
You can find the official accepted version on the arXiv here.
Finally for this week we have “A new non-parametric method to infer galaxy cluster masses from weak lensing” by Tobias Mistele (Case Western Reserve University, USA) and Amel Durakovic (Czech Academy of Sciences, Czechia). This one was also published on 19th December and is in the folder Cosmology and NonGalactic Astrophysics. The overlay is here
You can find the officially-accepted version on arXiv here.
That’s in for this week. I will do another update next Saturday only if we have any new papers on Monday. I will be taking a break over Christmas and also preparing Volume 8 (2025) for the new year, so publishing will be suspended from 24th December until 2nd January (inclusive). If you want your paper to be published in 2024 the final version must be on arXiv by Monday 23rd December at the latest, otherwise it will be held over until 2025.
#arXiv240210731v3 #arXiv240402566v2 #arXiv240613732v2 #arXiv240807026v3 #arXiv240817445v2 #AstrophysicsOfGalaxies #CosmologyAndNonGalacticAstrophysics #darkMatter #GravitationalLensing #HighEnergyAstrophysicalPhenomena #InstrumentationAndMethodsForAstrophysics #subMmAstronomy #supernovae #ultraDiffuseGalaxies
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Illustration of the Firefly Sparkle Galaxy in the Early Universe (Artist's Concept) ✨
#Galaxies #GalaxyClusters #GravitationalLensing
⏩ 4 new pictures from Webb (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=5&user=OptimusPrimeBot&ilshowall=1&offset=20241212100528
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Found: First Actively Forming Galaxy as Lightweight as Young Milky Way https://science.nasa.gov/missions/webb/found-first-actively-forming-galaxy-as-lightweight-as-young-milky-way/ #NASA #Astrophysics #Galaxies #GalaxyClusters #GoddardSpaceFlightCenter #GravitationalLensing #JamesWebbSpaceTelescopeJWST #ScienceResearch #TheUniverse
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Astronomers discover two galaxies aligned in a way where their gravity acts as a compound lens
https://phys.org/news/2024-11-astronomers-galaxies-aligned-gravity-compound.html
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...and here is the next gem from the
@j824h_arXiv_astro_ph today: exact analytic solutions to the equations of motion around a Kerr black hole in 78-page detail:
https://arxiv.org/abs/2411.13368
@plotastro look at Fig. 5 from this paper! 🤩#cosmology #gravitation #astronomy #GravitationalWaves #GravitationalLensing
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Had a great day at the @mpi_grav today! Thanks @miguelzuma for hosting me so kindly, I learnt a lot about wave optics and I look forward to more interactions as strong lenses all share the same formalism after all. 🤩 Hopefully, some lensing degeneracies can be broken by studying interference patterns.
#GravitationalLensing #Cosmology #GravitationalWaves #GravitationalWave
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Question Mark Galaxy, Annotated (NIRCam Compass Image) ✨
#DistantGalaxies #Galaxies #GalaxyClusters #GravitationalLensing
⏩ 4 new pictures from Webb (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=4&user=OptimusPrimeBot&ilshowall=1&offset=20240905103627
