Beautiful relativistic MHD simulations of the initial stage of jets expansion, as a function of their different orientation with respect to the main axis of the halo of their host galaxy.
New simulations using the PLUTO code by G. Giri and collaborators today on #astroph
https://arxiv.org/abs/2604.05471
"Galactic-scale evolution of classical and complex radio galaxies. Impact of ambient morphology and jet geometry"
A new radio analysis of the double radio relic (=pairs of expanding merger shock waves, ~Megaparsec wide) in the merging cluster of galaxies MACS
J1752.0+4440
by M. Della Chiesa et al. today on #astroph https://arxiv.org/pdf/2604.02410
Deep multi-wavelength radio observations allow to study how radio emitting electrons age in different part of the relic, helping to better understand the plasma properties in regions deeply affected by shocks
https://mastodon.social/@franco_vazza/116328055383790715
Well let me at least point to one legit article today on #astroph, by my colleague here F. Ubertosi:
https://arxiv.org/abs/2603.28864
"AGN Fueling and Radio Jet Evolution in the Galaxy Group NGC 5044 revealed by VLBA HI Absorption and Proper-Motion Radio Observations"
which is a serious one.
(At least, I think?)
W-O-W
people really really were in the mood today on #astroph
I do not remember such an avalanche of "jokes".
to the point all other few serious articles in todays list are just going to be lost for me.
I like this infographic showing different modalities of propagation for charged and neutral cosmic rays in the cosmic web, in this new article on #astroph
"The ‘Forgotten’ Neutrons: Implications for the Propagation
of High-Energy Cosmic Rays in Magnetized Astrophysical
and Cosmological Structures" by E. Owen et al. https://arxiv.org/pdf/2603.25060
this morning in #astroph
"The birth of the intracluster medium: the evolution of multiphase gas
and Lyman-α haloes in a simulated z ∼ 3 protocluster" by J. Bennet et al.
https://arxiv.org/pdf/2603.16991
a nice simulated view using Arepo of how the typical thermodynamical and chemical structure of the intracluster medium is first formed around z=3, through the interplay of accretions, galaxy and AGN activity.
Very cool on #astroph by @giovanni_covone and A. Balbi:
" Photosynthetic exergy I. Thermodynamic limits for habitable-zone planets"
which proposes new upper limits on
photosynthetically harvestable power for planets in the habitable-zone
When astronomers are discovering so many things that they run out of names:
meet the "red potato" 🥔 quiescient galaxy tracing a node of the cosmic web at redshift z=3
https://arxiv.org/pdf/2601.20473
by Wang et al.
today in #astroph
Interesting this morning on #astroph
"MeerKAT observations of Abell 1775 and Abell 1795: the discovery of a
hadronic radio halo?" by R. van Weeren et al.
https://arxiv.org/pdf/2601.16288
I am a bit puzzled but this might be the first case in which significant secondary emission (i.e. injected by secondary relativistic electrons resulting from hadronic collisions between cosmic ray protons and thermal protons) is found in a cluster of galaxies. Cool!
franco_vazza