#PLUG Topic: Network Basics for the uninitiated. A core topics discussion for those who don't know where to start
This Thu @ 19:00 AZ ( UTC - 7 )
1702 E Highland, Phoenix
Bio: Alyssa enjoys the various Linux options and currently works as a Senior Network Engineer
@FLOSS_Stammtisch is next Tue, which is St Patrick's Day. It will be in person near Boulders on Southern in Mesa, maybe at Green Corner ( gyros! )
#LocalGroup #Arizona #FLOSSgroup #Stammtisch #FLOSS_Stammtisch #networking
@PLUG
Study Reveals a Massive Flat Structure of Matter Surrounding the Milky Way
📰 Original title: Astronomers discover giant cosmic sheet around the Milky Way
🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅
View full AI summary: https://killbait.com/en/study-reveals-a-massive-flat-structure-of-matter-surrounding-the-milky-way/?redirpost=bbc6ec1b-f22c-4bad-ae57-784f2a919a13
Study Reveals a Massive Flat Structure of Matter Surrounding the Milky Way
📰 Original title: Astronomers discover giant cosmic sheet around the Milky Way
🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅
View full AI summary: https://killbait.com/en/study-reveals-a-massive-flat-structure-of-matter-surrounding-the-milky-way/?redirpost=bbc6ec1b-f22c-4bad-ae57-784f2a919a13
𝗪𝗜𝗞𝗜𝗣𝗘𝗗𝗜𝗔'𝗦 𝗙𝗘𝗔𝗧𝗨𝗥𝗘𝗗 𝗔𝗥𝗧𝗜𝗖𝗟𝗘
✧ galaxy ✧
A galaxy is a massive system bound together by gravity that contains stars and surrounding matter, stellar remnants, interstellar matter, and dark matter, all orbiting a common center of gravity. Typical galaxies range from as few as 10 million stars up to supergiants with 100 trillion stars, but most of the mass is dark matter. The Solar System is in the Milky Way ga...
#SolarSystem #LocalGroup #Earth #Wikipedia
https://en.wikipedia.org/wiki/Galaxy
FLOSS_Stammtisch is Tuesday night in Mesa, Arizona
We meet monthly at 19:00 AZ time ( UTC-7 ) for conversation, food and drinks on the third Tuesday
Including #ActivityInThePub since Boulders is a pub
Location - Boulders on Southern, 1010 W Southern Ave, Mesa, AZ
@socallinuxexpo is in a few weeks, before PLUG or Stammtisch in March
@PLUG #Stammtisch #LocalGroup #Arizona #PLUG #FLOSS_Stammtisch #Phoenix #Tempe #Mesa #PhxFedi and #AZFedi @FLOSS_Stammtisch
Cosmography alert 🚨
Tango of Titans: Centaurus A and M83 as a Local Group Analog
by David Benisty, Noam Libeskind, and Dmitry Makarov
https://arxiv.org/abs/2602.11268
#Cosmography #Cosmology #galaxies #astronomy #astrophysics #astrodon #science #news #LocalGroup
Centaurus A (CenA) and M83 form one of the most massive galaxy pairs in the nearby Universe. Although their observed heliocentric velocities suggest motion that is not obviously indicative of mutual attraction, this work presents evidence that CenA and M83 are in fact infalling toward each other, exhibiting a dynamical interaction analogous to the binary-like motion of the Milky Way and Andromeda in the Local Group (LG). Using the Timing Argument (TA), calibrated with analog galaxy pairs from the AbacusSummit simulation, we estimate the total mass of the CenA/M83 system under the assumption that the line-of-sight (LoS) velocity is dominated by motion toward the system's barycenter. This yields a total mass of $(6.36 \pm 1.30) \cdot 10^{12}\, M_\odot$. The inferred mass agrees well with independent estimates based on virial mass measurements and $K$-band luminosity--to-mass ratios. Together, the consistent bound signature and robust mass determination highlight the CenA/M83 system as a compelling nearby analog to the LG. Further discussion of NGC 4945 as a main perturber (as the Large Magellanic Could) for the CenA is also discussed.
Re-returning to the command line for part 2
Anatomy of the Command Line Part Deux: Examples Happen
Last month we covered what happens when.This month we'll use more examples to illustrate command parsing in action
Thu @ 19:00 AZ ( UTC - 7 )
1702 E Highland, Phoenix
@FLOSS_Stammtisch is next Tue, the 17th, in person at Boulders on Southern in Mesa
https://fosstodon.org/@PLUG/115852611079317330
#LocalGroup #Phoenix #Arizona #FLOSSgroup #LUG #PLUG #Stammtisch #FLOSS_Stammtisch #CLI #shell #bash
A ‘large-scale sheet’ surrounding the Milky Way explains the motion of nearby galaxies
#Cosmology #LocalGroup #galaxies #MilkyWay #astrodon #astrophysics #science #news
FLOSS_Stammtisch is Tuesday night in Mesa, Arizona
We meet monthly at 19:00 AZ time ( UTC-7 ) for conversation, food and drinks on the third Tuesday
Including #ActivityInThePub since Boulders is also a pub
Location - Boulders on Southern, 1010 W Southern Ave, Mesa, AZ
@PLUG #Stammtisch #LocalGroup #Arizona #PLUG #FLOSS_Stammtisch #Phoenix #Tempe #Mesa #PhxFedi and #AZFedi
Cosmography alert 🚨
Revisiting the Great Attractor: The Local Group's streamline trajectory, cosmic velocity and dynamical fate
by Richard Stiskalek and co-authors (incl. @AstroMikeHudson)
https://arxiv.org/abs/2601.08524
#Cosmography #GreatAttractor #Cosmology #galaxies #Astronomy #Astrophysics #Astrodon #science #news #LocalGroup #Laniakea #supercluster #LaniakeaSupercluster
We revisit the Great Attractor using the Manticore-Local suite of digital twins of the nearby Universe. The Great Attractor concept has been proposed as an answer to three distinct questions: what sources the Local Group velocity in the cosmic microwave background frame, where present-day velocity streamlines converge, and where the Local Group is moving to. Addressing the original motivation of the Great Attractor -- explaining the Local Group cosmic velocity -- we find that mass within $155~h^{-1}\mathrm{Mpc}$ accounts for only ${\sim}72\%$ of that velocity magnitude with ${\sim}38\,°$ directional offset. We show that even in the purely linear regime convergence within this volume is not guaranteed, particularly when also accounting for small-scale contributions to the observer velocity; no single structure, including the proposed Great Attractor, would be expected to dominate the velocity budget. Streamline convergence is smoothing-scale-dependent, transitioning from Virgo at small scales through the Hydra--Centaurus region at intermediate scales to Shapley at large scales; at intermediate smoothing the convergence point lies near Abell 3565 with an asymmetric basin of mass $\log( M / (h^{-1} \mathrm{M}_\odot)) = 16.4 \pm 0.1$ that excludes Norma. To address the third question, we evolve the Manticore-Local realisations to scale factor $a = 10$ in a new Beyond-Present-Time simulation suite and identify the asymptotic future location of the Local Group. We find that the dominant motion is towards Virgo, but even it contributes at most one third of the Local Group velocity. Our results demonstrate that the classical Great Attractor is not a dynamically dominant structure but an artifact of the instantaneous velocity field, and that no single attractor is likely to account for the Local Group motion in the cosmic rest frame.
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FLOSS Stammtisch