Andrea Botteon
@andreabotteon.bsky.social
Astrophysicist at INAF-IRA. Previously at UniBologna and UniLeiden. Mainly dealing with colliding galaxy clusters, merger shocks and their radio outcome.
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
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
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)
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
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
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
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...
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
@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
.@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
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
#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
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
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
Great paper on the Great Attractor, just published by The Open Journal of Astrophysics doi.org/10.33232/001... @ojastro.bsky.social 🧪 #Cosmology #Cosmicflows
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
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
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
Andrea Botteon@andreabotteon.bsky.social · last yr.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
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
Andrea Botteon@andreabotteon.bsky.social · 11mo agoNew 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
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
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! 🔭
Annie Heinrich@spaceweatherwoman.bsky.social · 10mo agoalright maybe I should start using this account properly. Hi! I'm Annie, I'm getting a PhD from UChicago in X-ray observations of galaxy clusters. I mostly work on data from Chandra and XRISM.
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
Radial Profiles of Radio Halos in Massive Galaxy Clusters: Diffuse Giants Over 2 Mpc
We present new, high frequency radio observations of the merging galaxy clusters PLCK G287.0+32.9, Abell 2744, and Bullet. These clusters are known to host $\sim$Mpc scale sources, known as radio halo...
arxiv.org
Andrea Botteon@andreabotteon.bsky.social · last yr.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
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
