Cosmography archives
Planisphère des nébuleuses et amas d'étoiles observés par Messier
Camille Flammarion, L'Astronomie (1917)
https://ui.adsabs.harvard.edu/abs/1917LAstr..31..385F/abstract
#Cosmology #Cosmography #Messier #CamilleFlammarion #Flammarion #nebulae #galaxies #nebula #Nebulæ #CosmographyArchives #science #astronomy #astrodon #MilkyWay #Galaxy #planisphère #science #history #Historyofscience #map #maps #heavens #chart #charts #cartography #Astronomie
Cosmography archives
The Rich Nebular Regions in Virgo and Coma Berenices
by Richard A. Proctor (1872)
https://doi.org/10.1093/mnras/33.1.14
#Cosmography #galaxies #stars #RichardProctor #Virgo #ComaBerenices #CosmographyArchives #Cosmology #nebulae #science #history #HistoryOfScience #astronomy #astrodon #MilkyWay
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.
Cosmography archives
On Two Distribution Maps of the Nebulæ and Clusters in Dr. Dreyer's Catalogue of 1888.
by Sidney Waters (1894)
https://ui.adsabs.harvard.edu/abs/1894MNRAS..54..526W/abstract
#Cosmology #Cosmography #nebulae #galaxies #nebula #Nebulæ #CosmographyArchives #SidneyWaters #science #astronomy #astrodon #MilkyWay #Galaxy #LargeMagellanicCloud #SmallMagellanicCloud #science #history #Historyofscience #map #maps #heavens #chart #charts #cartography
The first three issues of Worlds of IF science fiction since the revival by Starship Sloane Publishing. They look good in print!
Each issue has a story by me: "Our Place on the Map of the Universe", "From Deep Darkness came Murmurs of Awakening", and "A Three-Dimensional Chessboard Universe"
Prints and digital copies available at https://worldsofifmagazine.com/
#WorldsOfIF #worldsofifmagazine #scifi #sciencefiction #magazine #literature #StarshipSloane #reading #read #reader #news #Cosmography
Published on this day 9 years ago: the discovery of the Dipole Repeller
➡️ Milky Way being pushed through space by cosmic dead zone https://www.theguardian.com/science/2017/jan/30/milky-way-being-pushed-through-space-by-cosmic-dead-zone-say-scientists
➡️ Milky Way galaxy is being pushed across the universe https://edition.cnn.com/2017/01/31/world/milky-way-dipole-repeller-space-trnd/index.html
➡️ Cosmic Void “Pushes” Milky Way https://skyandtelescope.org/astronomy-news/cosmic-void-pushes-milky-way-3001201723/
#Cosmology #DipoleRepeller #Cosmography #galaxies #MilkyWay #Galaxy #science #news #astrodon #astronomy #astrophysics #gravitation
Cosmography alert 🚨
How well is the local Large Scale Structure of the Universe known? CosmicFlows vs. Biteau's Galaxy Catalog with Cloning
by Yifei Li and Glennys Farrar
https://arxiv.org/abs/2601.20808
#Cosmology #Cosmicflows #Cosmography #Universe #Astrodon #Astronomy #Astrophysics #cosmicrays #science #news #arXiv
Knowledge of the actual density distribution of matter in the local universe is needed for a variety of purposes -- for instance, as a baseline model for ultrahigh energy cosmic ray sources in the continuum limit and for predicting the diffuse Dark Matter annihilation signal. Determining the local mass density and velocity distribution is the aim of the CosmicFlows project. An alternate approach is based on catalogs of galaxies, supplemented with some scheme for filling in for unseen galaxies. Here, we compare the density field proposed by Biteau (2021) with the quasi-linear density field of CosmicFlows2 (Hoffman et al. 2018) and the mean posterior field of CosmicFlows4 (Valade 2026). We find factor-two level differences in some regions and even greater in regions toward the Galactic center zone of avoidance (ZoA) (|l| < 30°, |b| < 20°) as filled by Biteau using "cloning". Within 11 Mpc the density field is well-determined by the Local Volume catalog (Karachentsev et al. 2018) which Biteau directly incorporates; at larger distances, Biteau (2021) should not be used in the ZoA where "galaxies" are entirely fictitious but otherwise is to be preferred over CosmicFlows emphasizing the direction and integrated mass of structures; the radial distribution of mass in Biteau (2021) is less robust due to line-of-sight peculiar velocities. The angular positions of structures in CosmicFlows are sometimes not congruent with evidence in the galaxy catalog.
"Structures cosmiques : une famille de géantes"
I was yesterday on France Culture to talk about the discovery of the Quipu Supercluster and other large scale structures.
#Cosmology #Cosmography #Quipu #QuipuSupercluster #Laniakea #LaniakeaSupercluster #SouthPoleWall #SloanGreatWall #CosmicWeb #science #astrophysics #astronomy #astrodon #radio #podcast #FranceCulture #Radiofrance
Comment Quipu, structure parmi les plus grandes, a-t-elle été identifiée ? De quoi sont composés les filaments de galaxies et de matière noire qui forment les structures de l'univers ? En quoi leur identification permet-elle de préciser notre compréhension de la cosmologie ?
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.
Cosmography archives
First Approximation to a Chart of the Nubecula Major, or greater Magellanic Cloud.
by John Herschel (1847)
https://ui.adsabs.harvard.edu/abs/1847raom.book.....H/abstract
#Cosmography #JohnHerschel #LargeMagellanicCloud #LMC #Nubeculae #NubeculaMajor #nebula #galaxies #Cosmology #nebulae #chart #map #cartography #stars #CosmographyArchives #science #astronomy #astrodon #science #history #historyofscience
Daniel Pomarède