iiinova — where your digital self keeps evolving

Andrea Botteon @andreabotteon.bsky.social · 02/09/2026

New MeerKAT results on A520, by Giacintucci+ This "train wreck cluster" is undergoing a complex merger. The 1.3 GHz data presented unveil a plethora of merger-generated non-phenomena, with new radio structures discovered on very large scales arxiv.org/abs/2609.00156

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Andrea Botteon @andreabotteon.bsky.social · 01/09/2026

Investigating a 13 Mpc intra-cluster filament with POSSUM, by Stuardi+ The RM of background sources is used to constrain the B field strength, with main uncertainties due to the Galactic foreground modeling (a critical factor for extragalactic studies) arxiv.org/abs/2608.28758

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Joe Callingham @astrojoe.bsky.social · 31/08/2026

The future of low frequency radio astronomy is space! It is only in space that we can unlock the last part of the electromagnetic spectrum that has yet to be explored. I am fortunate to play a minor part in this team lead by Joe Lazio for the MegaWave Radio Surveyor space mission.

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Andrea Botteon @andreabotteon.bsky.social · 31/08/2026

Delayed announcement of two papers appeared on arXiv last week: -In @cjriseley.bsky.social+ we performed a radio/X-ray study of the cool core cluster 2A 0335+096 arxiv.org/abs/2608.24309 -In Rajpurohit+ we investigated the radio emission from the famous Stephan's Quintet arxiv.org/abs/2608.26461

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Hossam Khalil @hossam.bsky.social · 19/08/2026

Paper day! My second 1st-author paper has been accepted for publication in A&A and is now on the arXiv: arxiv.org/abs/2608.17735. We use X-ray data from the first eROSITA-DE all-sky survey (eRASS1) to study the hot gas (baryon) budget of nearby galaxy groups out to the virial radius🧵☄️

arxiv.org

eROSITA cosmology with galaxy groups: hot gas budget out to the virial radius

Non-gravitational processes that expel hot gas beyond the virial regions of groups and clusters of galaxies, known collectively as baryonic feedback, play a key role in reshaping the matter distributi...

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Andrea Botteon @andreabotteon.bsky.social · 17/07/2026

We used the deepest radio observations ever carried out on a galaxy cluster to map the topology of the large-scale magnetic field underlying one of the largest radio emission (~5 Mpc) detected in the ICM 🧲. The paper is in press in @aanda-journal.bsky.social 1/11 arxiv.org/abs/2607.14209

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Andrea Botteon @andreabotteon.bsky.social · 09/07/2026

Paper alert! Let me introduce you the "Treble Clef" radio phoenix. This is a bright and highly filamentary radio source we noticed with @LOFAR (in LoTSS) a few years ago and followed-up over the past years... 1/10 arxiv.org/abs/2607.06659

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Roland Timmerman @rtimmerman.bsky.social · 01/07/2026

Today is paper day again! Right now on arXiv: LOFAR-VLBI observations of Abell 2199, revealing a set of steep-spectrum synchrotron threads for the first time. Also, the radio lobes show an almost perfectly homogeneous CRe population. (arxiv.org/abs/2606.30714 w/ @andreabotteon.bsky.social)

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Andrea Botteon @andreabotteon.bsky.social · 01/07/2026

New @LOFAR-VLBI observations of 3C338 in A2199, by @rtimmerman.bsky.social+ (w/ myself++) We studied the known emission bridge + discovered narrow synchrotron threads with alpha>3 likely tracing magnetic threads in the ICM. Curiously, the lobes show uniform spectral indexes arxiv.org/abs/2606.30714

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Andrea Botteon @andreabotteon.bsky.social · 10/06/2026

The dynamics of the Anglerfish cluster, by Destafanis+ (w/ @IacopoBart, @fabiogasta, @sghizza69, @mcrossetti_twit++) The combination of radio, X-ray, optical observations + comparison with numerical simulations give insights on the ongoing complex merger arxiv.org/abs/2606.10483

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Andrea Botteon @andreabotteon.bsky.social · 09/06/2026

New @XRISM_jp results on A1795, by Sarkar+ Low turbulence and bulk velocities are measured in the ICM, with indication of radial declining sigma_v and P_NT/P_T. Evidence for for multiphase gas and resonant scattering are also reported arxiv.org/abs/2606.08097

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Andrea Botteon @andreabotteon.bsky.social · 26/05/2026

We have opened a PhD position at INAF-IRA on the project "Unveiling the origin of diffuse radio emission in galaxy clusters through MeerKAT and LOFAR observations" see info.ira.inaf.it/wp-content/u... Deadline: June 15th For more details on the application, see www.unibo.it/en/study/phd...

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Andrea Botteon @andreabotteon.bsky.social · 08/05/2026

Big @LOFAR paper on clusters today, by @CStuardi+ We searched for diffuse emission in all clusters in LoTSS-DR3 (3000+ clusters over 19k+ deg^2) and report all the detections. This big effort required relying on Radio U-Net, a CNN optimized for this task arxiv.org/abs/2605.06400

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Durham University @durham.ac.uk · 28/04/2026

@icc-durham.bsky.social @durhamphysics.bsky.social researchers are part of the FLAMINGO project, which has released one of the largest datasets in cosmology! This gives scientists worldwide a new way to explore how the Universe evolves 👉 tinyurl.com/339vteyc @dirac-hpc.bsky.social, @ukri.org

A visualisation of the most massive cluster in the simulation of a cube. Blue, purple, yellow and white colours swirl against a dark blue backdrop.

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Andrea Botteon @andreabotteon.bsky.social · 26/03/2026

.@LOFAR observations at 30-58 MHz of the Perseus Cluster, by @ChristianGroe18+ (w/ myself++) Interestingly, the spectrum of the Mpc-scale radio halo recently reported is not steeper than that of the mini halo, though this measurement remains challenging! arxiv.org/abs/2603.23587

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Andrea Botteon @andreabotteon.bsky.social · 04/03/2026

What is the origin of 1LHAASO J0343+5254u? by @hen_edler, @itsMariaArias, myself, @cbassa.bsky.social Our multi-band analysis suggests that the PWN candidate previously proposed to be its origin is actually an obscured galaxy cluster, unrelated to the LHAASO emission arxiv.org/abs/2603.03164

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Alessandro Ignesti @a-ignesti.bsky.social · 26/02/2026

#paperday #Extragalactic What determines whether a galaxy can become a jellyfish galaxy? Thanks to new Meerkat data, we now propose that this may be due to a combination of supersonic orbits and interactions with the magnetic field of the galaxy cluster. More at arxiv.org/abs/2602.21821

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RAS Journals @rasjournals.bsky.social · 26/02/2026

Published in #MNRAS: "Wiggling through the ICM: multiresolution radio imaging of a tailed radio galaxy in MACS J1354.6+7715", Gani et al. These are Figs. 1 & 6: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

High-resolution LOFAR HBA image of the tailed radio galaxy (C) in the galaxy cluster MACS J1354.6+7715, observed at 144 MHz. A and B denotes two compact radio sources, while D marks an additional radio source detected in the field. Please see the paper for the full caption.

Composite image of the cluster combining optical, radio, and X-ray data. Please see the paper for the full caption.

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Andrea Botteon @andreabotteon.bsky.social · 19/02/2026

LoTSS-DR3, by Shimwell+ (w/ many) We have released the largest collection of data from a radio survey: 13M+ sources detected over 19k deg^2 (88% of the Northern sky). This took ~13k h of @LOFAR observations, ~18 PT of data, and 10+ years of work. Data are public from today arxiv.org/abs/2602.15949

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Daniel Pomarède @pomarede.bsky.social · 17/02/2026

Great paper on the Great Attractor, just published by The Open Journal of Astrophysics doi.org/10.33232/001... @ojastro.bsky.social 🧪 #Cosmology #Cosmicflows

Screenshot from the frontpage of the Open Journal of Astrophysics, featuring the following article informations. Title reads "Revisiting the Great Attractor: The Local Group's streamline trajectory, cosmic velocity and dynamical fate". Authors list: Richard Stiskalek, Harry Desmond, Stuart McAlpine, Guilhem Lavaux, Jens Jasche, Michael J. Hudson. Summary reads "The study revisits the Great Attractor concept, finding that it doesn't dominate the Local Group's cosmic velocity; multiple structures contribute to the motion, with no single attractor accounting for it". Dated February 17, 2026. Background image featuring an allsky map of the depth of the inferred Classical Great Attractor basin as a function of sky position in Galactic coordinates.

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Andrea Botteon @andreabotteon.bsky.social · 06/02/2026

A radio relic mimicking a radio halo? by @paola-dominguez.bsky.social+ (w/ @jzuhone.bsky.social @emstar.bsky.social myself+) This could be the case of MACSJ0018.5+1626, where numerical simulations show that the radio emission could be due to a relic seen face-on arxiv.org/abs/2602.05050

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Andrea Botteon @andreabotteon.bsky.social · 26/01/2026

Radio observations A1775 and A1795, by vanWeeren+ (w/ @cjriseley.bsky.social, @rtimmerman.bsky.social, myself+) MeerKAT @SKA_Africa recovers the known diffuse emission in both systems. Interestingly, the large-scale halo in A1795 is compatible with a hardonic origin... arxiv.org/abs/2601.16288

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Andrea Botteon @andreabotteon.bsky.social · 21/01/2026

New study of two merging galaxy clusters, by Srikanth+ (w/ myself, @roxycas++) @LOFAR, GMRT, and @ESA_XMM observations are combined to investigate the nature of the diffuse emission in A773 and A1351. Congrats to Koushika on her first paper! arxiv.org/abs/2601.13316

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Andrea Botteon @andreabotteon.bsky.social · 23/12/2025

What comes after paper I? Paper II! Still led by @e_derubeis In the new paper, a more detailed investigation about the origin of the filaments is done by combining LOFAR @astronnl.bsky.social data with new uGMRT and VLA observations at higher frequency arxiv.org/abs/2512.19471

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Andrea Botteon @andreabotteon.bsky.social · 10/12/2025

Paper accepted for publication in @aanda-journal.bsky.social! You can find the accepted version in today's replacements on arXiv (arxiv.org/abs/2509.14348). The only notable update is that we left the merger scenario open, as we are not sure if the clusters are observed pre or post collision

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Andrea Botteon @andreabotteon.bsky.social · 01/12/2025

A fresh look at Abell 2163, by Santra+ (including myself) This is one of the hottest, most massive, and brightest cluster in the sky. New uGMRT band 3 and band 4 data are used to study the giant (among the largest!) radio halo hosted in this merging system arxiv.org/abs/2511.22124

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Andrea Botteon @andreabotteon.bsky.social · 04/11/2025

Check for the wonderful science that @axisprobe.bsky.social would enable in the white book uploaded today in arXiv: arxiv.org/abs/2511.00253 I've participated with a chapter on "X-ray and radio surface brightness edges in the ICM", you can find it in the Galaxies GO Science section (page 69)

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Andrea Botteon @andreabotteon.bsky.social · 21/10/2025

News on Abell 754 from @XRISM_jp, by Okabe+ and Omiya+ Combining the gas kinematic from XRISM and WL from Subauru, a new merger scenario is proposed. The "3rd dimension" has been unlocked thanks to XRISM 😀 arxiv.org/abs/2510.16291 arxiv.org/abs/2510.16553

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Daniel Pomarède @pomarede.bsky.social · 16/10/2025

in the #arXiv Numerical Cosmology by Romain Teyssier arxiv.org/abs/2510.13129 🧪 #Cosmology

Color rendering of the dark matter particle distribution from a N-body simulation of a LCDM model. Dark matter halos are visible as clumps of different sizes. The color coding follows the mass of the halos, with large halos appearing redder and small halos appearing bluer. The characteristic filamentary structure of the Cosmic Web is striking. Simulation credit: RAMSES. Image credit: S. Colombi.

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Annie Heinrich @spaceweatherwoman.bsky.social · 26/09/2025

I also had two papers come out this month! I worked on the first XRISM results from the Perseus cluster and got time on XRISM to observe A1914, which we discovered was undergoing a line-of-sight merger! 🔭

Heinrich+ 2025 Figure 1. XRISM spectrum showing emission from helium-like and hydrogen-like iron in A1914. The spectrum is modeled with two emission components

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Andrea Botteon @andreabotteon.bsky.social · 19/09/2025

New paper alert! We studied a galaxy cluster pair with @SKA_Africa MeerKAT UHF and @NCRA_Outreach uGMRT band 3 data and found diffuse emission between the two clusters! 1/7 arxiv.org/abs/2509.14348

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Andrea Botteon @andreabotteon.bsky.social · 29/08/2025

Low frequency observations of the Ophiuchus cluster, by Giacintucci+ The giant fossil lobe is studied in detail. The new data show steep spectrum filamentary structures embedded in the lobe. The lobe extends up to 820 kpc from the cluster center arxiv.org/abs/2508.20190

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Andrea Botteon @andreabotteon.bsky.social · 02/07/2025

.@XRISM_jp obs of the Ophiuchus cluster, by Fujita+ A low velocity dispersion is measured in the inner and outer regions (115 km/s at <25kpc, 186 km/s at 25-50 kpc). The same goes for the bulk velocity (8 km/s vs 104 km/s): is the sloshing at its minimum? arxiv.org/abs/2507.00126

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Andrea Botteon @andreabotteon.bsky.social · 02/07/2025

The magnetic field in A2142, by Pagliotta+ A rotation measure and polarization study is performed with MeerKAT. The magnetic field profile of the ICM is drawn, indicating a central field strength of 9.5 muG at the cluster center. arxiv.org/abs/2507.00114

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Andrea Botteon @andreabotteon.bsky.social · 02/07/2025

MeerKAT observations of CHEX-MATE clusters, by Balboni+ (w/ @annalisa-astro.bsky.social, myself++) A sample of 21 massive clusters is studied. Diffuse radio emission is detected in all systems (new halos and relics!) arxiv.org/abs/2507.00133

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Frits Sweijen @fsweij.bsky.social · 26/06/2025

Happy to have been a coauthor on this paper led by Maria Arias and @rtimmerman.bsky.social looking at the crab nebula with the full International #LOFAR Telescope that was put on arxiv yesterday! Lots of nice sub-arcsecond detail is revealed. Go check out the paper on arxiv arxiv.org/abs/2506.19460

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Kostas Migkas @kmigkas.bsky.social · 19/06/2025

📢Paper and press releases day! We report the first-ever unambiguous detection of WHIM/missing baryons in a single cosmic filament using @ESA_XMM and @JAXA_en Suzaku data! It's the first time observations agree with LCDM simulations for the nature of WHIM www.aanda.org/articles/aa/...

aanda.org

Detection of pure warm-hot intergalactic medium emission from a 7.2 Mpc long filament in the Shapley supercluster using X-ray spectroscopy | Astronomy & Astrophysics (A&A)Mendeley

Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics

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Andrea Botteon @andreabotteon.bsky.social · 28/05/2025

The central region of A3667 in hard X-rays, by @MSMirakhor+@astroswalker A @NASANuSTAR observation of the cluster is presented. The spectrum is better described by a 2T thermal model. An updated limit of B > 0.2 muG is provided from the lack of IC emission arxiv.org/abs/2505.20453

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Andrea Botteon @andreabotteon.bsky.social · 21/05/2025

Thin filaments in the tails of A2255, by DeRubeis+ (w/ myself, @jurjen93.bsky.social+) A2255 is known to be a "mess" (arxiv.org/abs/2006.04808). The new @LOFAR-VLBI images add further complexity in the system, this time revealing small-scale structures in its radio galaxies arxiv.org/abs/2505.13595

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Dr. James Beattie @astromagnetism.bsky.social · 13/05/2025

The cascade of kinetic and magnetic energy from large to small scales in galactic-style turbulence behaves significantly different to the theoretical models that we regularly assume work. www.nature.com/articles/s41... Published in @natastron.nature.com

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Andrea Botteon @andreabotteon.bsky.social · 09/05/2025

Radial properties of radio halos, by Rajpurohit+ (w/ myself+) New radio halos with LLS>2 Mpc are reported, even at high-frequency. We measured the surface brightness and spectral properties of the emission, obtaining important results (more below) arxiv.org/abs/2505.05415 1/4

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Andrea Botteon @andreabotteon.bsky.social · 30/04/2025

Measurements of gas velocities in the ICM in the Coma cluster by @XRISM_jp This is the first time that the gas velocity dispersion is measured in a merging cluster with a microcalorimeter! Interesting results: sigma_v is low while v_bulk is quite high... arxiv.org/abs/2504.20928

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Andrea Botteon @andreabotteon.bsky.social · 24/04/2025

Paper accepted, today on arXiv (w/ @fabiogasta+)! We studied the Ophiuchus cluster, a massive sloshing system in the local Universe, with @SKA_Africa MeerKAT L band. The main discoveries are the detection of synchrotron threads and jellyfish galaxies 1/8 arxiv.org/abs/2504.16158

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Dr. Emily Moravec 📡 @dreamoravec.bsky.social · 21/04/2025

Extra Extra: Paper day! 🚨📄 In our recently published paper, Mary Rickel and I and collaborators investigated whether the merging galaxy cluster environment affects the morphology of radio-AGN, and we find that it does!👇Thread. iopscience.iop.org/article/10.3...

iopscience.iop.org

The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei - IOPscienceSearchopens in new tab

The Merging Galaxy Cluster Environment Affects the Morphology of Radio Active Galactic Nuclei, Rickel, Mary, Moravec, Emily, Gordon, Yjan A., Hardcastle, Martin J., Pierce, Jonathon C. S., Bilton, Lawrence E., Roberts, Ian D.

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