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Daniel Pomarèdepomarede
2026-02-17

Cosmography archives

The Rich Nebular Regions in Virgo and Coma Berenices

by Richard A. Proctor (1872)

doi.org/10.1093/mnras/33.1.14

#Cosmology #Cosmography #galaxies #CosmographyArchives #nebulae #science #astronomy #astrodon #MilkyWayA map of the distribution of stars and nebulae. Title reads "The Nebular Region in Coma Berenices".
Daniel Pomarèdepomarede
2026-02-13

Cosmography alert 🚨

Tango of Titans: Centaurus A and M83 as a Local Group Analog

by David Benisty, Noam Libeskind, and Dmitry Makarov

arxiv.org/abs/2602.11268

Daniel Pomarèdepomarede
2026-02-04

Cosmography archives

On Two Distribution Maps of the Nebulæ and Clusters in Dr. Dreyer's Catalogue of 1888.

by Sidney Waters (1894)

ui.adsabs.harvard.edu/abs/1894

The nebulæ and clusters of the Northern Heavens drawn upon an equal surface projection. The chart features a drawing of the Milky Way. The irresolvable nebulæ, now understood to be galaxies, are marked as black dots. Their distribution is rather inhomogeneous, exhibiting structures such as aggregations and filaments. The resolvable nebulæ are marked as red dots. Star clusters are marked with a red cross; they mostly adhere to the track of the Milky Way.The nebulæ and clusters of the Southern Heavens drawn upon an equal surface projection. The chart features a drawing of the Milky Way. The irresolvable nebulæ, now understood to be galaxies, are marked as black dots. Their distribution is rather inhomogeneous, exhibiting structures such as aggregations and filaments. The Large and Small Magellanic Clouds stand out as extraordinary aggregations near the centre of the chart. The resolvable nebulæ are marked as red dots. Star clusters are marked with a red cross; they mostly adhere to the track of the Milky Way.
Daniel Pomarèdepomarede
2026-01-31

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 worldsofifmagazine.com/

Three science fiction magazines side by side.
Daniel Pomarèdepomarede
2026-01-30

Published on this day 9 years ago: the discovery of the Dipole Repeller

➡️ rdcu.be/wqbG

➡️ Milky Way being pushed through space by cosmic dead zone theguardian.com/science/2017/j

➡️ Milky Way galaxy is being pushed across the universe edition.cnn.com/2017/01/31/wor

➡️ Cosmic Void “Pushes” Milky Way skyandtelescope.org/astronomy-

A map of cosmic flows on the billion lightyears scale, showing the divergence of the flow at the Dipole Repller, and convergence at the Shapley Attractor. The Cosmic Velocity Web in displayed in terms of filaments (gray surfaces) and knots (in red). Isosurfaces of the potential field are also shown.
Daniel Pomarèdepomarede
2026-01-29

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
arxiv.org/abs/2601.20808

Daniel Pomarèdepomarede
2026-01-27

"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.

radiofrance.fr/franceculture/p

Daniel Pomarèdepomarede
2026-01-15

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)
arxiv.org/abs/2601.08524

Daniel Pomarèdepomarede
2026-01-14

Cosmography archives

First Approximation to a Chart of the Nubecula Major, or greater Magellanic Cloud.

by John Herschel (1847)
ui.adsabs.harvard.edu/abs/1847

Plate X from John Herschel's book "Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope; being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825" featuring an unfolded map of the Large Magellanic Cloud, giving the positions and either the magnitudes or classes of stars and nebulae versus right ascension and N.P.D. North Pole Distance. A number of regions of interest are delineated by rectangles with references to other plates and figures featured in the book.
Daniel Pomarèdepomarede
2026-01-09

Cosmography archives

Astronomical Observations relating to the Construction of the Heavens, arranged for the Purpose of a critical Examination, the Result of which appears to throw some new Light upon the Organization of the celestial Bodies.

by William Herschel (1811)

ui.adsabs.harvard.edu/abs/1811

The 42 figures, laid over two plates, depicting the observations discussed by Herschel in his paper.
Daniel Pomarèdepomarede
2026-01-08

It's Stephen Hawking's birthday. The occasion to share this fantastic video he produced as part of his Genius documentatry series. Hawking elaborates on our place in the Universe, including our membership to the Laniakea supercluster of galaxies that we discovered back in 2014.

The complete documentary: pbslearningmedia.org/resource/

In the Darktelescoper.blog@telescoper.blog
2025-11-29

Weekly Update from the Open Journal of Astrophysics – 29/11/2025

It’s Saturday again, so it’s time for the usual update of the week’s new papers at the Open Journal of Astrophysics. Publishing this week was interrupted by the Thanksgiving holiday in the United States, which meant there were no arXiv announcements yesterday. Nevertheless, since the last update we have published another four papers, which brings the number in Volume 8 (2025) up to 184, and the total so far published by OJAp up to 419.

The first paper this week is “A theoretical prediction for the dipole in nearby distances using cosmography” by Hayley J. Macpherson (U. Chicago, USA) and Asta Heinesen (Niels Bohr Institute, Denmark). This was published on Monday 24th November 2025 in the folder Cosmology and Nongalactic Astrophysics. It presents a method to predict the dipole in luminosity distances that arises due to nearby inhomogeneities to leading-order correction to the standard isotropic distance-redshift law. Incidentally, I wrote about a talk by one of the authors here.

The overlay is here:

 

You can find the officially accepted version on arXiv here and the Fediverse announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "A theoretical prediction for the dipole in nearby distances using cosmography" by Hayley J Macpherson (U. Chicago, USA) and Asta Heinesen (Niels Bohr Institute, Denmark)

doi.org/10.33232/001c.150319

November 24, 2025, 8:25 am 2 boosts 1 favorites

 

The second paper of the week is “A Targeted Gamma-Ray Search of Five Prominent Galaxy Merger Systems with 17 years of Fermi-LAT Data” by Siddhant Manna and Shantanu Desai (IIT Hyderabad Kandi, India). This one was published on Tuesday November 25th 2025 in the folder marked High-Energy Astrophysical Phenomena. It describes a search for gamma-ray emission in Fermi-LAT data from five merging galaxy systems with marginal detections for two of them

The overlay is here:

 

You can find the official version of this one on arXiv here. The federated announcement on Mastodon is here:

 

Next one up is “Metallicity fluctuation statistics in the interstellar medium and young stars – II. Elemental cross-correlations and the structure of chemical abundance space” by Mark R. Krumholz (ANU, Australia), Yuan-Sen Ting (Ohio State U., USA), Zefeng Li (Durham U., UK), Chuhan Zhang (ANU), Jennifer Mead (Columbia U., USA) and Melissa K. Ness (ANU). This was published in the folder Astrophysics of Galaxies on Wednesday November 26th. It presents an extended stochastically-forced diffusion model for the chemical evolution of galaxies, making quantitative predictions for the degree of correlation in abundance patterns in both gas and young stars.

The overlay is here:

 

You can find the official accepted version on arXiv here. The fediverse announcement is here:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "Metallicity fluctuation statistics in the interstellar medium and young stars – II. Elemental cross-correlations and the structure of chemical abundance space" by Mark R. Krumholz (ANU, Australia), Yuan-Sen Ting (Ohio State U., USA), Zefeng Li (Durham U., UK), Chuhan Zhang (ANU), Jennifer Mead (Columbia U., USA) and Melissa K. Ness (ANU)

doi.org/10.33232/001c.150356

November 26, 2025, 8:34 am 1 boosts 1 favorites

The fourth and final paper of the week is “Simulating realistic Lyman-alpha emitting galaxies including the effect of radiative transfer” by Hasti Khoraminezhad & Shun Saito (Missouri Institute of Science & Technology, USA), Max Gronke (U. Heidelberg, Germany) and Chris Byrohl (MPA Garching, Germany). An empirical model for Lyman-alpha emitters (LAEs) which provides predictions for the halo occupation distributions and relationship between luminosity and halo mass, including the distribution of satellite LAEs. It was published on Thursday November 27th 2025 in the folder Astrophysics of Galaxies.

The overlay is here:

You can find the official published version on arXiv here. The Fediverse announcement follows:

Open Journal of Astrophysics

@OJ_Astro@fediscience.org

New Publication at the Open Journal of Astrophysics: "Simulating realistic Lyman-alpha emitting galaxies including the effect of radiative transfer" by Hasti Khoraminezhad & Shun Saito (Missouri Institute of Science & Technology, USA), Max Gronke (U. Heidelberg, Germany) and Chris Byrohl (MPA Garching, Germany)

doi.org/10.33232/001c.151254

November 27, 2025, 9:20 am 1 boosts 1 favorites

And that concludes the update for this week. I will do another next Saturday.

#arxiv250701095v3 #arxiv250714572v2 #arxiv250716707v2 #arxiv250806232v2 #astrophysicsOfGalaxies #chemicalAbundances #cosmography #cosmology #cosmologyAndNongalacticAstrophysics #diamondOpenAccess #diamondOpenAccessPublishing #fermiLat #galaxyMergers #gammaRay #highEnergyAstrophysicalPhenomena #lymanAlphaEmitters #metallicity #openAccess #openAccessPublishing #openJournalOfAstrophysics #theOpenJournalOfAstrophysics

Daniel Pomarèdepomarede
2025-11-28

Cosmography archives

Distribution of the Nebulæ, drawn from the 1864 General Catalogue of Nebulæ and Clusters of Stars published by John Herschel.

by Richard A. Proctor (1869)
ui.adsabs.harvard.edu/abs/1869

Celestial maps of the counts of nebulae in the Northern and Southern hemispheres. Both maps have the Milky Way outlined. A fraction of the nebulae considered in these charts are now known to be of anagalactic nature, that is, objects external to our own galaxy the Milky Way. The Large Magellanic Cloud stands out near the south pole. Aggregations of nebulae and structures can be noticed, particularly at high galactic latitude. A Zone of Few Nebulae, or zone of nebular dispersion, is discussed by Proctor in the paper.
Daniel Pomarèdepomarede
2025-11-24

Cosmography archives

Nêbuleuses découvertes par différens Astronomes, que M. Messier a cherchées inutilement.

Connoissance des Temps, ou Connoissance des Mouvemens Célestes, Pour l'Année bissextile 1784, pp 268-269.

gallica.bnf.fr/ark:/12148/bpt6

The first page of a detailed account of Messier's unsuccessful attempts at confirming the existence of several nebulae reported by Hevelius, La Caille, Cassini, and Flamsteed.The second page of a detailed account of Messier's unsuccessful attempts at confirming the existence of several nebulae reported by Hevelius, La Caille, Cassini, and Flamsteed.
Daniel Pomarèdepomarede
2025-11-15

Worlds of IF: Science Fiction #179

The new issue of the venerable scifi magazine has launched. Cover art by Bruce Pennington; stories by Robert Silverberg, David Gerrold; two never-published-before Professor Jameson stories; "A Three-Dimensional Chessboard Universe" by me; and much more!

amazon.com/Worlds-IF-Science-F

A green toned cover of the Worlds of IF science fiction magazine. Cover art features a spaceship flying above a maze, aiming at a moon.
Daniel Pomarèdepomarede
2025-11-15

A Revised Three-dimensional Visualization of the Local Group of Galaxies, by Antonio Ciccolella

☑️ research note of the AAS doi.org/10.3847/2515-5172/ae1e
☑️ ultra-high resolution version flic.kr/p/2rD6yGU

The Milky Way and its satellite dwarf galaxies.A wider view of the Milky Way and its satellite dwarf galaxies.The Andromeda galaxy and its satellite dwarf galaxies.The full visualization of the Local Group.
Daniel Pomarèdepomarede
2025-11-05

Cosmography archives

The Distribution of Extra-Galactic Nebulae

by Edwin Hubble (1934)

ui.adsabs.harvard.edu/abs/1934

An all sky map displaying the distribution of galaxies in the galactic coordinate system, in the Aitoff projection. Small dots represent survey fields with normal distribution; large disks and circles represent fields with excesses and deficiencies, with crosses added for larger ones. Dashes represent fields with no galaxies.
Daniel Pomarèdepomarede
2025-11-03

Cosmography archives

Large-scale superclusters surrounding the giant galaxy void in Boötes?

by Neta Bahcall and Raymond Soneira (1982)

ui.adsabs.harvard.edu/abs/1982

A redshift map of the distribution of clusters and superclusters with respect to the Boötes void.
In the Darktelescoper.blog@telescoper.blog
2025-10-19

On Cosmography (and going Mainstream)

On Friday I attended a colloquium in the Physics Department at Maynooth University by Asta Heinesen of the Niels Bohr Institute in Copenhagen. The talk had the title of Cosmography of the local Universe, as shown on the first slide:

Asta talked about a very interesting programme of work that takes a different approach from most of modern cosmology in that it avoids making the prior assumption of global homogeneity and isotropy embodied by the Friedmann–Lemaître–Robertson–Walker metric. In particular, instead of assuming the isotropic expansion of the Universe, it tries to determine its properties directly using only such measurements as luminosity distances and redshifts. This method is not entirely model-independent because it does assume Lorentz invariance and the conditions required for the Etherington Reciprocity Theorem to hold, but it does not assume any particular form of the metric, so can be applied on scales where the distribution of matter is inhomogeneous and isotropic, e.g. in our local neighbourhood.

To apply this “metric-free” idea one has to construct as general as possible description of the kinematic properties of the underlying matter flow, allowing the global expansion to be anisotropic, and for there to be both rotation and shear. Obviously one would need a large number of measurements to extract anything like a full description of the matter flow, so generally one is restricted to deriving the low-order multipoles (monopole. dipole and quadrupole) as well as the observer’s velocity with respect to the large-scale matter flow.

I found Asta Heinesen’s seminar very stimulating in itself, but it was also nice to see that one of the papers on which it was based is published in the Open Journal of Astrophysics:

When I checked it, I found it was published on my birthday! Here is the overlay:

I announced it on this blog here.

I freely admit that I feel quite proud to have played a small part in helping to get such interesting work published. I’m seeing more and more papers referenced like this, actually. I was reminded of the recent announcement of this year’s list of MacArthur Fellows. among them Kareem El-Badry who has published quite a few papers with the Open Journal of Astrophysics. His biography on the MacArthur Foundation page includes this:

He has published articles in Monthly Notices of the Royal Astronomical Society, The Astrophysical Journal, and The Open Journal of Astrophysics, among other leading scientific journals.

I’m pleased to see us listed with the established names. I mention this just in case there are still people out there who think it might damage their career if they publish with a non-mainstream journal. We are mainstream now…

#AstaHeinesen #cosmography #Cosmology #expansionOfTheUniverse #TheOpenJournalOfAstrophysics

Public Domain Image Archivepdimagearchive
2025-09-25

An Alternative Interpretation by Homer B. Sprague (1915) by William Fairfield Warren, from The Universe Pictures in Milton's Paradise Lost; An Illustrated Study for Personal and Class Use.

Source: University of Toronto Libraries / Internet Archive

Available to buy as a print.

pdimagearchive.org/images/c606

Diagram of Milton's cosmos

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