The 2nd: Simulations of galaxy cluster mergers with velocity-dependent, rare and frequent self-interactions led by V. Sabarish.We find that effects of velocity-dep X-sections appear when comparing early-time and late-time oscillation amplitude of the BCG
https://arxiv.org/abs/2310.07769
Hamburg Observatory
An institute of the University of Hamburg
Today a double feature on astro-ph: Two studies using simulations of velocity-dependent and self-interacting Dark Matter.
First up: Cosmological & idealised simulations of DM haloes with velocity-dependent, rare and frequent self-interactions, led by M. Fischer. We find that a strongly velocity-dependent cross-section can significantly amplify the diversity of rotation curves https://arxiv.org/abs/2310.07750
Hamburg Observatory boosted:
What better first post, than to share that today is my first day at the University of Hamburg. I'm excited to get to work. You can find me at the observatory in Bergedorf @HambObs
https://www.uni-hamburg.de/newsroom/presse/2023/pm50.html
Hamburg Observatory boosted:
“A multishock scenario for the formation of radio relics”
by D. Smolinksi, D. Wittor, M. Bruggen of @HambObs and myself.
in press on MNRAS
https://arxiv.org/abs/2310.04504
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.
Hamburg Observatory boosted:
In this new work led by D. Smolinksi (master student at @HambObs) we started instead with the blind selection of a simulated cluster with a large shock crossing its periphery at the end of the run. This shock is wide by weak, M~1.6. Can it become a radio relic too?
So we tracked the Lagrangan history of 10 million gas tracer particles ending up there, thanks to the magic allowed by simulations, which allow us to analyse any past moments in time of a system’s evolution.
Big code paper dropped by our S. Rosswog introducing the Lagrangian Numerical Relativity code SPHINCS_BSSN. https://arxiv.org/pdf/2306.06226.pdf
Today on astro-ph: Evidence of Extended Dust and Feedback around z≈1 Quiescent Galaxies via Millimeter Observations
with our student K. Böckmann
https://arxiv.org/abs/2306.04760
Today on astro-ph: A search for inter-cluster filaments with LOFAR and eROSITA led by D. Hoang et al. We did not find any emission from filaments but could find important constraints on B-fields.
Discovery should be within reach.
Hamburg Observatory boosted:
Referenced link: https://www.scientificamerican.com/article/six-gravitational-wave-breakthroughs-scientists-cant-wait-to-see/
Discuss on https://discu.eu/q/https://www.scientificamerican.com/article/six-gravitational-wave-breakthroughs-scientists-cant-wait-to-see/
Originally posted by Scientific American / @sciam: http://nitter.platypush.tech/sciam/status/1660685509281103878#m
After years of downtime for upgrades, the world's premier gravitational-wave observatories are coming back online with big hopes for transformative discoveries https://www.scientificamerican.com/article/six-gravitational-wave-breakthroughs-scientists-cant-wait-to-see/
Just posted: Theoretical follow-up to our study of circumgalactic magnetic fields. led by R. Ramesh w. V. heesen and M. Brüggen.
Azimuthal Anisotropy of Magnetic Fields in the Circumgalactic Medium Driven by Galactic Feedback Processes
https://arxiv.org/abs/2305.11214
Today on the arxiv: A morphological analysis of the substructures in radio relics, led by D. Wittor.
Takaway point: The bulk of the radiative flux in relics comes from filamentary structures.
Big paper on the arxiv today, led by our V. Cuciti et al.
The Planck clusters in the LOFAR sky V. LoTSS-DR2: Mass - radio halo power correlation at low frequency
arxiv.org/abs/2305.04564
Hamburg Observatory boosted:
Post-Doc opportunity (1+1 year) at @Unibo working with me on
"Realistic radio jets in cosmological simulations"
The deadline to apply: 15 May 2023 - the start 1st of July (also possible initially remotely).
Pls ask me for more details!
Italian dinner at the Observatory with my group. What a fun evening. Photo by Giulia Lusetti
Today on the arxiv: The eROSITA Final Equatorial-Depth Survey (eFEDS): A #machinelearning Approach to Infer Galaxy Cluster Masses from #eROSITA X-ray Images led by S. Krippendorf @esrabulbul
The Observatory’s P. Grete covered in this press release from Oak Ridge National Lab. Codes Cholla, HACC, and Parthenon are ready to launch the exascale era of computational astrophysics
https://www.olcf.ornl.gov/2023/04/26/simulating-a-more-detailed-universe-with-frontier/
Hamburg Observatory boosted:
The Moon through the Arc de Triomphe
Image Credit & Copyright: Stefano Zanarello
Hamburg Observatory boosted:
Question for y’all:
If you go to a public talk about physics/astrophysics, what, to you, makes it a GOOD talk? What makes it an enjoyable experience? Are you going to learn physics? To be dazzled? To experience awe? To listen to someone smart say smart things? To be entertained? What’s most important to you?
Beautifully written memoir of John Archibald Wheeler, written by Kip Thorne. Full of amusing anecdotes. The list of Wheeler's PhD students is mind-blowing.
Client Info
Server: https://mastodon.social
Version: 2025.04
Repository: https://github.com/cyevgeniy/lmst