(I forgot to mention like a week ago that it was) #PaperDay!
Here our group shows the 1st successful theoretical model that predicts the degree & angle of linear #polarization of scattered night-sky #light accounting for ground light sources. A 🧵 (1/14)
The low frequency radio detection using #LOFAR, allows to refine our understanding of this cosmic monsters which I described already in the past (https://mastodon.social/)
#paperday
This small observational/theoretical review about the seeding of cosmic ray electrons by cluster radio galaxies by myself and Andrea Botteon just got accepted
A thorough analysis of X-ray fluctuations in the CHEX-MATE sample of 64 clusters observed with XMM-Newton, as a proxy for the gas velocity fluctuations due to turbulence.
#paperday
"Resistively controlled primordial magnetic turbulence decay" https://arxiv.org/abs/2401.08569
by A. Brandenburg, A. Neronov and myself.
As in the good tradition of multiple author papers, in this one the first author has done 99% of the work, so kudos to him!
“Efficiency of turbulent reacceleration by solenoidal turbulence and its application to the origin of
radio mega halos in cluster outskirts” by K. Nishiwaki, Brunetti, Vazza & Gheller.
It is a new sophisticated exploration of the evolution of relativistic electrons in the vast volume of galaxy clusters, and it uses a cosmological MHD simulations to make a sense of recent fascinating radio observations.
"On the evolution of Betti curves in the Cosmic web"
it uses topological analysis of the cosmic web (identified through the location of all halos in simulation) to show that there is a new very stable "invariant", captured by the "Betti curve", which is preserved for all z<2 evolution and can be used for #cosmology!
in this work, we explored the importance of the multiple re-acceleration by shocks in the intracluster medium, as a general mechanism to explain why many clusters of galaxies light up with radio emission in spite of the fact that the shocks
they contain are weak.
"Constraints on the magnetic field in the inter-cluster bridge
A399–A401" by Marco Balboni et al., including myself, accepted by A&A, in press: https://arxiv.org/abs/2309.10847
It's a nice observation-simulation joint analysis to estimate the minimum plausible magnetic field in a bright synchrotron emitting bridge between two clusters (believed to be the final and dense stage of a cosmic filament) , mostly based on Rotation Measure Synthesis.
The cosmic web leaves a mark on visible matter through subtle correlations involving galaxy shapes. How do we quantify these "Intrinsic Alignments"?
For the long answer, see “The IA Guide”, now on arXiv! For the short answer, keep reading.
arxiv.org/abs/2309.08605
Here is our attempt to study the formation of Mega Radio Halos with cosmological simulations - work led by Luca Beduzzi (master student at Uni PD) https://arxiv.org/abs/2306.03764
Bottom line:
the formation of this new class of giant radio objects appear compatible with the continuous turbulent re-acceleration of fossil electrons, operating on Gyr timescales.