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franco_vazza

@franco_vazza@mastodon.social

#SimulatedUniverses #AstroPhysicsFactlet
Astrophysicist at Bologna University and https://respublicae.eu/@ERC_Research grantee.
I study the cosmic web, extragalactic magnetism and clusters of galaxies with colorful simulations.

https://cosmosimfrazza.eu
#astrodon #astronomy

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franco_vazza, to Astro
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Flashy distribution of many quantities in my latest ENZO runs on the LEONARDO supercluster at CINECA.

Of course, it moves ⬇️

franco_vazza,
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franco_vazza, to Astro
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Honestly, how sad is to end a semester course without an even small clapping?
It was a ~50h long performance...

franco_vazza,
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@richard well no, I don't memorise anything. let's say it's a sort of improv show running for several weeks?

apolitosb, to random
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Some offices have better views

franco_vazza,
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@apolitosb Tuscany?

franco_vazza,
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@apolitosb Indeed it looks familiar...I was there just 10 days ago .
Don't miss the chance to visit Galileo's home just 200m away, they just started the public openings during the weekend!

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franco_vazza, to Astro
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I predict the next big cult of the Sun will be started by radio astronomers, whose life has become way too much dependent on the cycles of solar activity these days.
Human sacrifices of post-docs and phd will be the next step I guess. 😬

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franco_vazza, to Astronomy
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webcams from the mountains next to where I was born (Cansiglio in Veneto) got a nice coverage of the on the 10 of May.

astrodon
https://webcam.io/webcams/zA2QRM

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franco_vazza, to Astronomy
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Awesome work by F.Ubertosi (University of Bologna) using from LOFAR to VLBI radio observations (together with Chandra's X-ray obs.) to probe the feedback history of central galaxy in cluster RBS 797

https://arxiv.org/pdf/2405.08079

covering in radio from ~100kpc to ~10pc in scales (!) this study support the idea that the dynamics of this system is explained by a binary supermassive black hole merger

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franco_vazza, to Astronomy
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new Coronal Mass Ejection (CME) on its way towards Earth, although producing a smaller event compared to last weekend.

https://www.spaceweatherlive.com/en/news/view/540/20240513-m6-6-solar-flare-with-earth-directed-cme.html

(Radio astronomer in the house is freaking out again because her observations must be rescheduled again 😬 )


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franco_vazza,
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@cavyherd haven't read it...how does it end ...? 😬😬😬😬

franco_vazza, to photography
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Just two antennas!
Not even low frequency, just low on the ground

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franco_vazza, to Astro
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Oh my, just look at this X-ray (Chandra) and radio (Meerkat) composite image of the centre of the Milky Way, by Mackey et al. (submitted to ApJ)!!

https://chandra.harvard.edu/photo/2024/vent/index.html

This is the press-release composite image of this paper:
https://arxiv.org/pdf/2310.02892

franco_vazza, to Astro
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Sources of magnetic fields appear in this universe - which just samples the first ~1/10 of evolution of a big 2048^3 simulations running on LEONARDO at CINECA (using a customised version of the ENZO code), and it just samples a thin slice through the simulation.

Magnetic field strength on the left, gas density on the right.
The injection of magnetic fields here only follows the onset of star formation (and later on of active galactic nuclei).


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franco_vazza,
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@hfalcke

Your friend has impeccable taste for crucial questions!

Here a biased list of things:

I start with some "classical" material:

next, the latest results and my opinion:

franco_vazza,
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@hfalcke

-https://arxiv.org/abs/2009.01539 test of models allowed by CMB

next, my summary:

franco_vazza,
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@hfalcke

My take:

  • B in galaxy clusters (e.g. Coma is very well observed) is explained by both seeding from galaxies or primordial fields;

  • the combination of lower limits in voids from blazars, and statistical detections in radio (RM + synchrotron) excludes a purely astroph. origin of cosmic B.

  • current modelling of RM in LOTSS prefers primordial models with power on large scales (hence, inflationary).

  • extra: this may explain the GW background 🤯 nhttps://arxiv.org/pdf/2009.14174

franco_vazza,
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@hfalcke looking forward for the book of your friend, and feel free to discuss this offline if you want

franco_vazza, to random
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incredible, FC is currently 3rd in football's Serie A and has mathematically qualified for next year Champions league....traffic in the city is going to be fun in a few months.

franco_vazza, to Astro
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This is an awesome professional website to check updates and physical measurements of the ongoing

https://www.swpc.noaa.gov/

franco_vazza, to Astro
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This is an astrophysics take of the : I have just used the CosmicRay Detector app on my laptop by the Global Cosmic Ray Observatory https://apps.apple.com/us/app/cosmic-ray-detect-radiation/id1169131314

to measure the flux of muons through the blocked shutter of the Ipad.

I don't have stats to compare with, but since I have already done the same experiment in the last two weeks speaking of cosmic ray detection at lecture, I have the feeling the muon flux is a bit higher now (~1 event/second).

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franco_vazza,
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@richard 😄 the thing is that I never used the mailer on the ipad, this is just for teaching!

franco_vazza, to Astronomy
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: here a nice picture of the aurora over (Italy), by Enrico Barelli

Hopes are it will repeat also this evening (it would be a first for me)

franco_vazza, to Astronomy
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Approaching strongest of the decade!

https://www.npr.org/2024/05/10/1250515730/solar-storm-geomagnetic-g4

Normal people: what?

People with a passion in science: cool, I am going to look up in the sky all night!

Radio astronomers: desperately rushes to change the schedule of her incoming observation at the Very Large Array even before having breakfast.

franco_vazza, to Astro
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Nice artistic rendering of the full variety of diffuse radio emissions we can presently observed and simulated in clusters of galaxies, also when they appear in pairs.
Slide by G.Piagnataro (UNIBO) at the SPARCS meeting.

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