Gravity Grinch<p>These results raise the question where we can track down dark matter? What do we know in the least model-dependent way? <br>For strong lensing, the question has an answer, look at this video for a recent summary:<br><a href="https://youtu.be/5FyaoYsCSVg?si=zmokA8g3XPCkoQwF" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">youtu.be/5FyaoYsCSVg?si=zmokA8</span><span class="invisible">g3XPCkoQwF</span></a></p><p><a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/StrongGravitationalLensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StrongGravitationalLensing</span></a> <a href="https://astrodon.social/tags/Cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cosmology</span></a> <a href="https://astrodon.social/tags/DarkMatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkMatter</span></a></p>
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#strongGravitationalLensing
3 posts · 1 participant · 0 posts today
Gravity Grinch<p>2) the Bullet cluster is a more complicated structure than a binary system of two big dark-matter clumps that are offset to the baryons:<br>arxiv.org/abs/2503.21870<br>Masses were reduced and bounds on SIDM were set. Looks like we need less dark matter if the structure is more complex!</p><p>...and there is also a method to constrain dark matter properties purely from the multiple images, see this NASA press release for more: <br><a href="https://science.nasa.gov/missions/hubble/double-galaxy-mystifies-hubble-astronomers/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/missions/hubb</span><span class="invisible">le/double-galaxy-mystifies-hubble-astronomers/</span></a></p><p><a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/StrongGravitationalLensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StrongGravitationalLensing</span></a> <a href="https://astrodon.social/tags/Cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cosmology</span></a> <a href="https://astrodon.social/tags/DarkMatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkMatter</span></a></p>
Gravity Grinch<p>Today was progress-day for lensing!<br>1) A1689 at z=0.183 is elongated along the line of sight:<br>arxiv.org/abs/2503.22316 <br>I hope there will be studies of A3827, too. The latter is only at z=0.1 and it seems that the thickness also affects the strong lensing effects: <br>arxiv.org/abs/2306.11779</p><p><a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/StrongGravitationalLensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StrongGravitationalLensing</span></a> <a href="https://astrodon.social/tags/Cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Cosmology</span></a> <a href="https://astrodon.social/tags/DarkMatter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DarkMatter</span></a></p>
Gravity Grinch<p>That's quite an interesting read today: new lensing survey data released with 100 strong-lensing galaxy-scale cases:<br><a href="https://arxiv.org/abs/2503.08777" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2503.08777</span><span class="invisible"></span></a><br><a href="https://arxiv.org/abs/2503.08782" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2503.08782</span><span class="invisible"></span></a><br><a href="https://arxiv.org/abs/2503.08785" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2503.08785</span><span class="invisible"></span></a> (congrats @astronat !)</p><p><a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/StrongGravitationalLensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StrongGravitationalLensing</span></a></p>
In the Dark<p><strong>Through a wine glass, darkly…</strong></p><p>Usually I disapprove of using a wine glass for any purpose other than drinking wine, but here’s a very neat short video by Phil Marshall explaining how you can use a one to simulate a strong gravitational lens such as the system that produced the wonderful <a href="https://telescoper.blog/2025/02/10/euclid-finds-an-einstein-ring/" rel="nofollow noopener noreferrer" target="_blank">Einstein ring recently discovered by Euclid</a>. More specifically it shows how perfect alignment leads to a ring whereas other configurations can produce multiple images or arcs.</p><p><a href="https://www.youtube.com/watch?v=IXfUk4Eltkg" rel="nofollow noopener noreferrer" target="_blank">https://www.youtube.com/watch?v=IXfUk4Eltkg</a></p><p>If you’re planning to try this at home, please remember to empty your glass beforehand.</p><p><a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/euclid/" target="_blank">#Euclid</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/phil-marshall/" target="_blank">#PhilMarshall</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/strong-gravitational-lensing/" target="_blank">#strongGravitationalLensing</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/wine-glass/" target="_blank">#wineGlass</a></p>
In the Dark<p><strong>Weekly Update from the Open Journal of Astrophysics – 01/02/2025</strong></p><p>It’s Saturday morning, so once again it’s time for an update of papers published at the <a href="https://astro.theoj.org" rel="nofollow noopener noreferrer" target="_blank">Open Journal of Astrophysics</a>. There were no papers to report last week but since the <a href="https://telescoper.blog/2025/01/18/weekly-update-from-the-open-journal-of-astrophysics-18-01-2025/" rel="nofollow noopener noreferrer" target="_blank">last update </a>we have published four new papers, which brings the number in <a href="https://astro.theoj.org/issue/11229" rel="nofollow noopener noreferrer" target="_blank">Volume 8 (2025)</a> up to 11 and the total so far published by OJAp up to 246.</p><p>In chronological order of publication, the four 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.</p><p>First one up is “<a href="https://astro.theoj.org/article/128482-a-halo-model-approach-for-mock-catalogs-of-time-variable-strong-gravitational-lenses" rel="nofollow noopener noreferrer" target="_blank">A halo model approach for mock catalogs of time-variable strong gravitational lenses</a>” by Katsuya T. Abe & Masamune Oguri (Chiba U, Japan), Simon Birrer & Narayan Khadka (Stony Brook, USA), Philip J. Marshall (Stanford, USA), Cameron Lemon (Stockholm U., Sweden), Anupreeta More (IUCAA, India), and the LSST Dark Energy Science Collaboration. It was published on 27th January 2025 in the folder marked <a href="https://astro.theoj.org/section/1188-cosmology-and-nongalactic-astrophysics" rel="nofollow noopener noreferrer" target="_blank">Cosmology and NonGalactic Astrophysics</a>. The paper discusses how to generate mock catalogs of strongly lensed QSOs and Supernovae on galaxy-, group-, and cluster-scales based on a halo model that incorporates dark matter halos, galaxies, and subhalos.</p><p> </p><p><a href="https://telescoper.blog/wp-content/uploads/2025/02/oguri_overlay.jpg" rel="nofollow noopener noreferrer" target="_blank"></a></p><p>You can find the officially accepted version of this paper on arXiv <a href="https://arxiv.org/abs/2411.07509v3" rel="nofollow noopener noreferrer" target="_blank">here</a>.</p><p>This paper, also published on Monday 27th January 2025, but in the folder <a href="https://astro.theoj.org/section/1189-astrophysics-of-galaxies" rel="nofollow noopener noreferrer" target="_blank">Astrophysics of Galaxies</a>, is “<a href="https://astro.theoj.org/article/129063-the-soltan-argument-at-redshift-6-uv-luminous-quasars-contribute-less-than-10-to-early-black-hole-mass-growth" rel="nofollow noopener noreferrer" target="_blank">The Soltan argument at redshift 6: UV-luminous quasars contribute less than 10% to early black hole mass growth</a>” by Knud Jahnke (MPI Heidelberg, Germany). This paper presents an argument that almost all growth of supermassive black hole mass at z>6 does not take place in UV-luminous quasars.</p><p><a href="https://telescoper.blog/wp-content/uploads/2025/02/jahnke_overlay.jpg" rel="nofollow noopener noreferrer" target="_blank"></a></p><p>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 <a href="https://arxiv.org/abs/2411.03184v2" rel="nofollow noopener noreferrer" target="_blank">here</a>.</p><p>The third paper to announce, published on 29th January 2025 in the folder <a href="https://astro.theoj.org/section/1188-cosmology-and-nongalactic-astrophysics" rel="nofollow noopener noreferrer" target="_blank">Cosmology and NonGalactic Astrophysics</a>, is “<a href="https://astro.theoj.org/article/129138-a-heavy-seed-black-hole-mass-function-at-high-redshift-prospects-for-lisa" rel="nofollow noopener noreferrer" target="_blank">A Heavy Seed Black Hole Mass Function at High Redshift – Prospects for LISA</a>” by Joe McCaffrey & John Regan (Maynooth U., Ireland), Britton Smith (Edinburgh U., UK), John Wise (Georgia Institute of Technology, USA), Brian O’Shea (Michigan State U., USA) and Michael Norman (University of California, San Diego). This is a numerical study of the growth rates of massive black holes in the early Universe and implications for their detection via gravitational wave emission.</p><p>You can see the overlay here:</p><p><a href="https://telescoper.blog/wp-content/uploads/2025/02/mccaffrey_overlay.jpg" rel="nofollow noopener noreferrer" target="_blank"></a></p><p> </p><p>The accepted version of this paper can be found on the arXiv <a href="https://arxiv.org/abs/2409.16413v2" rel="nofollow noopener noreferrer" target="_blank">here</a>.</p><p>The last paper of this batch is “<a href="https://astro.theoj.org/article/129066-forecasting-the-detection-of-lyman-alpha-forest-weak-lensing-from-the-dark-energy-spectroscopic-instrument-and-other-future-surveys" rel="nofollow noopener noreferrer" target="_blank">Forecasting the Detection of Lyman-alpha Forest Weak Lensing from the Dark Energy Spectroscopic Instrument and Other Future Surveys</a>” by Patrick Shaw & Rupert A. C. Croft (Carnegie Mellon U., USA) and R. Benton Metcalf (U. Bologna, Italy). This paper, published on January 30th 2025, is about extending the applicationof Lyman-α forest weak gravitational lensing to lower angular source densities than has previously been done, with forecasts for future spectral surveys. It is in the folder marked <a href="https://astro.theoj.org/section/1188-cosmology-and-nongalactic-astrophysics" rel="nofollow noopener noreferrer" target="_blank">Cosmology and NonGalactic Astrophysics</a>.</p><p>The overlay is here</p><p><a href="https://telescoper.blog/wp-content/uploads/2025/02/shaw_overlay-1.jpg" rel="nofollow noopener noreferrer" target="_blank"></a></p><p> </p><p>You can find the accepted version on arXiv <a href="https://arxiv.org/abs/2410.20014v2" rel="nofollow noopener noreferrer" target="_blank">here</a>.</p><p>Incidentally, we currently have 121 papers under review, including 81 under a revise and resubmit request.</p><p>That’s all for this week. I’ll do another update next Saturday.</p><p><a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/arxiv2409-16413v2/" target="_blank">#arXiv240916413v2</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/arxiv2410-20014v2/" target="_blank">#arXiv241020014v2</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/arxiv2411-03184v2/" target="_blank">#arXiv241103184v2</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/arxiv2411-07509v3/" target="_blank">#arXiv241107509v3</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/astrophysics-of-galaxies/" target="_blank">#AstrophysicsOfGalaxies</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/black-hole-seeds/" target="_blank">#BlackHoleSeeds</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/cosmology-and-nongalactic-astrophysics/" target="_blank">#CosmologyAndNonGalacticAstrophysics</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/diamond-open-access/" target="_blank">#DiamondOpenAccess</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/elisa/" target="_blank">#eLISA</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/lsst/" target="_blank">#LSST</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/lyman-alpha-forest/" target="_blank">#LymanAlphaForest</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/ojap/" target="_blank">#OJAp</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/open-access-publishing-2/" target="_blank">#OpenAccessPublishing</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/open-journal-of-astrophysics/" target="_blank">#OpenJournalOfAstrophysics</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/quasars/" target="_blank">#quasars</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/soltan-argument/" target="_blank">#SoltanArgument</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/strong-gravitational-lensing/" target="_blank">#strongGravitationalLensing</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/the-open-journal-of-astrophysics/" target="_blank">#TheOpenJournalOfAstrophysics</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/weak-gravitational-lensing/" target="_blank">#weakGravitationalLensing</a></p>
Gravity Grinch<p>For all <a href="https://astrodon.social/tags/astro" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astro</span></a> enthusiasts who look for some Sunday reading: have a look at my essay about what we know and what we don't know when analysing the light bending around cosmic structures<br><a href="https://forums.fqxi.org/d/3504-the-cosmological-cheshire-cat-predictable-and-unpredictable-dark-matter-properties-by-jenny-wagner" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">forums.fqxi.org/d/3504-the-cos</span><span class="invisible">mological-cheshire-cat-predictable-and-unpredictable-dark-matter-properties-by-jenny-wagner</span></a></p><p><a href="https://astrodon.social/tags/scicomm" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>scicomm</span></a> <a href="https://astrodon.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>science</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/cosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>cosmology</span></a> <a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/PhilosophyOfCosmology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PhilosophyOfCosmology</span></a> <a href="https://astrodon.social/tags/StrongGravitationalLensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>StrongGravitationalLensing</span></a></p>
In the Dark<p><strong>Space Warps from Euclid</strong></p><p>A few months ago I<a href="https://telescoper.blog/2024/08/01/euclid-galaxy-zoo/" rel="nofollow noopener noreferrer" target="_blank"> posted about a joint initiative between Euclid and Galaxy Zoo</a> that involved engaging members of the public in a project involving galaxy morphology. Well, a new “collab” (as you young people call such things) has just been announced on social media, and I encourage you to investigate further</p> <p>The new venture is called `Space Warps – ESA Euclid’, and its aim is to find <a href="https://en.wikipedia.org/wiki/Strong_gravitational_lensing" rel="nofollow noopener noreferrer" target="_blank">strong gravitational lenses</a> in Euclid survey images. You can find out more about this project in <a href="https://www.euclid-ec.org/space-warps-euclid/" rel="nofollow noopener noreferrer" target="_blank">this blog post by Knud Jahnke</a> and you can find instructions and sign up for the project <a href="https://www.zooniverse.org/projects/aprajita/space-warps-esa-euclid" rel="nofollow noopener noreferrer" target="_blank">here</a>.</p> <p>The announcement of this initiative gives me an opportunity to pass on a little update on progress with the Euclid survey. The first `Quick’ Data Release (known to its friends as Q1) was made available to Euclid Consortium members just a few weeks ago. This will be made available to the general public next March, around the same time as the <a href="https://www.cosmos.esa.int/web/euclid-eslab-2025" rel="nofollow noopener noreferrer" target="_blank">joint ESLAB and Euclid Consortium meeting</a> in Leiden next year. </p><p>The Euclid survey is constructed as a set of contiguous `tiles’ covering the survey region, which will ultimately be about 15,000 square degrees (about one-third of the sky), with most of the region scanned by the satellite many times. The Q1 data will just be a taster of this. The main component of the Q1 data relates to a single visit (at the depth of the <a href="https://euclid.caltech.edu/page/euclid-wide-survey" rel="nofollow noopener noreferrer" target="_blank">Euclid Wide Survey</a>) over the <a href="https://euclid.caltech.edu/page/euclid-deep-fields" rel="nofollow noopener noreferrer" target="_blank">Euclid Deep Fields</a> (EDFs): 20 deg2 of the EDF North, 10 deg2 of EDF Fornax, and 23 deg2 of the EDF South. The deep fields will subsequently be visited multiple times during the mission. The Q1 release will be of Level 2 data, i.e. data at the level of individual tiles.</p><p>The first full data release (DR1) is due to be published in June 2026. </p><p><a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/dr1/" target="_blank">#DR1</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/eas-euclid/" target="_blank">#EASEuclid</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/euclid/" target="_blank">#Euclid</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/euclid-consortium/" target="_blank">#EuclidConsortium</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/q1/" target="_blank">#Q1</a> <a rel="nofollow noopener noreferrer" class="hashtag u-tag u-category" href="https://telescoper.blog/tag/strong-gravitational-lensing/" target="_blank">#strongGravitationalLensing</a></p>
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