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

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

Pick your favorite "dot"

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

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

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

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)

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

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

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! 🔭

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

Aaand the paper has been accepted! The accepted version of the paper was posted on arXiv on Aug 19: arxiv.org/abs/2505.05415

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

.@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

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

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

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

📢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/...

Vanno ad Andrea Botteon e a Massimiliano Parente i due premi da duemila euro ciascuno della Società astronomica italiana consegnati oggi a Firenze. Congratulazioni!

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

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

A day late posting but after a lot of hard work I give you the survey overview papers for the EMU & POSSUM ASKAP surveys #EMU survey arxiv.org/abs/2505.08271 and the #POSSUM survey arxiv.org/abs/2505.08272 🔭

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

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

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

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

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...

Finally out! Our paper with the first N-body simulations of dark matter-baryon interactions is now on arXiv. arxiv.org/abs/2504.12393

Hercules-Corona Borealis Great Wall: an update Turns out the largest known structure in the observable universe is larger than previously thought, with members potentially spanning the redshift range of 0.33 < z < 2.43 by Istvan Horvath and co-authors arxiv.org/abs/2504.05354 🧪 #Cosmology

Lensing study of the Bullet cluster, by Cha+ JWST imaging is used to reconstruct the mass distribution in the system which appears more complex than previously thought. A possible bridge of ICL is detected between the two main colliding systems. arxiv.org/abs/2503.21870

🔥 Hot off the press 🔥 @michaelpgrehan.bsky.social, grad student in CITA’s plasma astro group (@bartripperda.bsky.social’s group) shows that relativistic reconnection is invariant to the underlying model: ideal, resistive MHD, MD, force free electrodynamics, doesn’t matter… arxiv.org/abs/2503.20013

Non-thermal phenomena in El Gordo, by Kale+ (w/ myself++) This is is one of the most distant cluster hosting a radio halo and relics. A broad band spectral analysis of the radio emission+constraints on the turbulent Mach number in the ICM are presented arxiv.org/abs/2503.18613

#paperday: Investigating AGN feedback in Hα-luminous galaxy clusters, by Fornasiero+ (a graduated master's student I had the pleasure of supervising!). This Chandra+JVLA analysis of A2009 completes the in-depth study of a list of high X-ray flux & Hα luminosity clusters, see arxiv.org/abs/2503.07781

Hunting for radio halos at high-z, by DiGennaro+ Diffuse emission is searched in a sample of 56 MaDCoWS galaxy clusters at 0.78 < z < 1.53. Possible halo-like diffuse emission is reported at 144 MHz in 5 of them arxiv.org/abs/2502.19273

Scaling relations of radio halos, by Balboni+ A "radio scaling-law model" is introduced to understand the dependence between non-thermal properties and cluster mass and redshift. This has been extensively explored in X-rays, but not in radio arxiv.org/abs/2502.18568

In the last 20 days I received 40+ emails about EAS2025/EAS special sessions announcements. I am curious to know if colleagues in the US receive emails with a similar rate for the AAS meetings...

Radio spectral analysis of Nest200047, by @marisa_brienza + The peculiar AGN at the center of this group is studied with data from 50 to 1500 MHz. The broad band allows the spectral characterization of the filaments + aging analysis of the multiple bubbles arxiv.org/abs/2502.18244

Last week we submitted a study to ApJL confronting the predictions from weakly compressible MHD theory with extremely high Re simulations and in situ measurements of Earth’s high beta magnetosheath, showing agreement between theory, simulation and observations. arxiv.org/abs/2502.08883

Another exciting paper that I am thrilled to have contributed to landed on arxiv earlier this week: a review of the last decade of high resolution imaging with LOFAR! Head over there now to see how far we have come in just a decade and what exciting prospects lie ahead. arxiv.org/abs/2502.06946

Elucidating the internal dynamics of galaxy clusters is key to understanding how they formed, and thus to gaining insights into the matter and energy content of the wider Universe https://go.nature.com/3CQb3IC

Two 2nd-author paper on arXiv today! 1. The head-tail radio galaxy and revived fossil plasma in Abell 1775, by @ArdianaBushi arxiv.org/abs/2502.04913 2. Radio emission from a massive node of the cosmic web, by @CStuardi arxiv.org/abs/2502.04823 1/3

Press release time! noirlab.edu/public/news/... It was a pleasure to be co-author on this paper about the z=4.9 quasar J1601+3102 led by my colleague over at @noirlabastro.bsky.social.

⚠️ A warning to my fellow astronomers🧪🔭: there seems to be a potentially systematic issue in ApJ introducing errors in citations in the production stage of papers, so if you have a current paper with them, check your proofs *very* carefully. ⚠️

We are excited to announce that registration and abstract submission for the conference “Beyond Earth: Lunar and Space Radio Missions” are now open. You can find more details about registration and abstract here: www.astron.nl/beyondearth.

Roughly 6,000 readers answered our poll, with many declaring that Bluesky was nicer, kinder and less antagonistic to science than X https://go.nature.com/42tH8Ai

aaand also paper III by Ahn+ is out today It focuses on the weak lensing analysis of the cluster. Four merger configurations are proposed https://arxiv.org/abs/2501.09067

New policy on paper length in A&A: https://www.aanda.org/component/content/article/11-news/3046-shaping-a-sustainable-future-for-a-a-new-policy-on-paper-length For regular papers, pages beyond page 12 will have a cost!

aaand today the paper led by @kamlesh_laxmi+ Here, a detailed multi-frequency radio study based on @LOFAR, uGMRT, and @TheNRAO JVLA observation is presented https://arxiv.org/abs/2501.08390

X-ray follow-up on the double radio system PSZ2G181, by @Andra_Stroe+ (w/ @kamlesh_laxmi, @HirokiAkamatsu, @WonkiLee786+) The merger scenario (and more!) is investigated with new @chandraxray and @ESA_XMM data. Other papers are planned on this system. https://arxiv.org/abs/2501.07651

First @XRISM_jp results on a galaxy cluster The central region of the relaxed cluster A2029 was observed. A limit on the ICM bulk velocity is reported (<100 km/s). The low velocity dispersion of 170 km/s implies a subsonic ICM (Mach~0.2) + P_NT/P_tot ~ 2% https://arxiv.org/abs/2501.05514