New in the #VirtualObservatory: “HE0435-1223 V and R light curves” by Sorgenfrei C. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A250
#Photometry #VisibleAstronomy #Quasars #GravitationalLensing
#GravitationalLensing
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
New in the #VirtualObservatory: “QUAC. QUasar Atlas and Catalogue” by QUAC collaboration
https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/298
#Quasars #BlLacertaeObjects #GravitationalLensing #Redshifted
New in the #VirtualObservatory: “Strong lensing cluster MACS J0138-2155 photometry” by Ertl S. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A157
#GalaxyClusters #GravitationalLensing #InfraredPhotometry #HstPhotometry
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
Small Dark Matter Clump Detected in Einstein Ring 10 Billion Light-Years Away
Astronomers have identified a remarkably small dark object, likely a clump of dark matter, within the Einstein ring B1938+666, located 10 billion light-years from Earth. This discovery, detailed in studies published on October 9, 2025, in Nature Astronomy and Monthly Notices of the Royal Astronomica... [More info]
Discovery of Possibly the Smallest Pure Dark Matter Clump Detected 10 Billion Light-Years Away
Scientists have detected an anomalous notch in the gravitational warp of space that could represent the smallest clump of pure dark matter ever observed. This dark object, with a mass about a million times that of our sun and located 10 billion light-years away, emits no light or stars and was found... [More info]
Scoperta una possibile “clump” di materia oscura: la più piccola mai osservata
🌌 Astronomers discover the largest black hole ever, 10,000 times heavier than Milky Way’s center. 🚀 Found in the Cosmic Horseshoe galaxy using gravitational lensing. #BlackHole #Astronomy #CosmicHorseshoe #GravitationalLensing #BreakingNews
New in the #VirtualObservatory: “HST/WFC3 phot. of the S1-SX images of SN Refsdal” by Kelly P.L. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/948/93
#HstPhotometry #Supernovae #GravitationalLensing #InfraredAstronomy
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
SCI4301: Dark Matter - Part 2 (April 6, 2022)
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
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
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
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
Weekly update from the Open Journal of Astrophysics – 29/03/25
It’s time once more for the regular Saturday morning update of papers published at the Open Journal of Astrophysics. Since the last update we have published three new papers which brings the number in Volume 8 (2025) up to 32 and the total so far published by OJAp up to 267.
We’re almost at the end of March so I checked the records. In the first three months of last year we published 22 papers, compared to the 32 so far this year.
We were affected by a few gremlins in the works at Crossref this week which delayed some submissions. Since our DOIs are generated and registered with Crossref at the time of publication this delayed some papers a little. I think these problems are ongoing but I know that the team at Crossref are working on them so expect will be fixed soon.
Anyway, in chronological order of publication, the three 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.
The first paper to report is “Gravitational Lensing of Galaxy Clustering” by Brandon Buncher & Gilbert Holder (University of Illinois Urbana Champaign) and Selim Hotinli (Perimeter Institute, Canada). This paper is in the folder marked Cosmology and NonGalactic Astrophysics and it was published on Thursday 27th March 2025. it presents a study of the cross-correlations between lensing reconstruction using galaxies as sources with cosmic shear measurements.
Here is the overlay:
You can read the officially accepted version of this paper on arXiv here.
The second paper of the week is “Reformulating polarized radiative transfer for astrophysical applications. (I) A formalism allowing non-local Magnus solutions” by Edgar S. Carlin (Instituto de Astrofísica de Canarias), Sergio Blanes (Universitat Politcècnica de Valencia) & Fernando Casas (Universitat Jaume I), all in Spain.
It appears in the folder Solar and Stellar Astrophysics. It presents a new family of numerical radiative transfer methods and their potential applications such as accelerating calculations involving Non-Local Thermodynamic Equilibrium. This paper was published on Friday 28th March 2025.
Here is the overlay:
You can find the officially accepted version of this paper on arXiv here.
The final paper, also published on Friday 28th March, is in the folder
Cosmology and NonGalactic Astrophysics. The title is “CosmICweb: Cosmological Initial Conditions for Zoom-in Simulations in the Cloud” and the authors are Michael Buehlmann (Argonne National Laboratory), Lukas Winkler (U. Wien), Oliver Hahn (U. Wien), John C. Helly (ICC Durham) and Adrian Jenkins (ICC Durham).
This paper describes a new database and web interface to store, analyze, and disseminate initial conditions for zoom simulations of objects forming in cosmological simulations. The database can be accessed directly here.
Here is the overlay:
The official published version can be found on the arXiv here.
That’s all for this week. I’ll do another update next Saturday.
#arXiv240200252v3 #arXiv240207988v2 #arXiv240602693v3 #cosmicShear #cosmologicalZoomSimulations #CosmologyAndNonGalacticAstrophysics #DiamondOpenAccessPublishing #galaxyClustering #GravitationalLensing #radiativeTransfer #SolarAndStellarAstrophysics #TheOpenJournalOfAstrophysics
🚀 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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