Same Place 🐲
同一個地方 🐲
📷 Nikon F4E
🎞️ Kentmere 400
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🇺🇦 #NowPlaying on #BBC6Music's #DonLettsCultureClashRadio
Flying On The Ground:
🎵 Goodbye, My Friend
#FlyingOnTheGround
https://goldenlionsounds.bandcamp.com/track/flying-on-the-ground-goodbye-my-friend
https://open.spotify.com/track/1f7caGYQ8aRCL7QYcil1sH
Non-Thermal Pressure due to Gas Motions in the Intracluster Medium: Confronting XRISM/Resolve with TNG-Cluster Simulations
Erwin T. Lau, Naomi Ota, Daisuke Nagai
https://arxiv.org/abs/2608.04757 https://arxiv.org/pdf/2608.04757 https://arxiv.org/html/2608.04757
arXiv:2608.04757v1 Announce Type: new
Abstract: Intracluster medium (ICM) gas motions probe cluster assembly, feedback, and non-thermal pressure support, but recent XRISM observations reveal velocity dispersions and non-thermal pressure fractions systematically lower than simulations predict, with extreme systems such as Abell 2029 falling below nearly all simulated clusters. Using the TNG-Cluster simulations, we show that the non-thermal pressure fraction depends sensitively on cool-core state and formation history, and provide a two-scale fitting function capturing both the inner cool-core suppression and outer rise of the radial profile. By forward-modeling mock XRISM observations and comparing them with both projected and intrinsic three-dimensional quantities, we find that azimuthal variations and projection effects contribute to the deficit in the observed velocity dispersion and non-thermal pressure fraction. This bias increases with radius and partially offsets the intrinsic outward rise in the true three-dimensional non-thermal pressure fraction. However, these effects cannot explain the extremely low values of the non-thermal pressure fraction observed in Abell 2029, which fall below approximately the 0th - 6th percentiles of the simulated cool-core cluster distribution at every measured radius under both the turbulence-only and turbulence-plus-bulk definitions. The remaining tension points to rare dynamical conditions or missing physics affecting the amplitude of gas motions in current ICM models.
toXiv_bot_toot
07:16 AM
What a morning and long day it was last week! Was already out & about for 3 hours when I got to this place, earlier mostly taking hundreds of images of the nearby (~500m away) Breslauer Hut and vicinity during sunrise... The first large (and loud) group of people already got up at 4AM, getting ready for climbing Wildspitze, another group left an hour later, as did I. Maintenance/repair works on the hut continued at 08:30, taking lots more pictures to document, interviewin…
City Lives V 🔃
城市人生 V 🔃
📷 Pentax 6x7
🎞️ LUCKY SHD 100 (6x7)
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Chiefs HC Andy Reid says Eric Bieniemy's wife, Mia, out of ICU following shooting https://league-frontend.pocket.nfl.com/news/chiefs-hc-andy-reid-eric-bieniemy-wife-mia-out-of-icu-following-shooting
Failing chemical tank in Orange County rises to 100 degrees
— the maximum temperature on the gauge
https://www.latimes.com/california/story/2026-05-24/failing-orange-county-chemical-tank-rises-to-…