Weekly Update from the Open Journal of Astrophysics 31/10/2026 It’s time for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further seven papers, bringing the number in Volume 9 (2026) to 256 and the total so far published by OJAp up to 704. I continue to include the posts made on our Mastodon account (on Fediscience); these announcements also contain a clickable form of the DOI for each paper. Our Mastodon account has regular updates and other announcements from OJAp too, including posts from the OJAp blog. The first paper this week was published on Tuesday 27th October in the folder Astrophysics of Galaxies. The title is “On the relation between magnetic field strength and gas density in the interstellar medium. II. Density uncertainties and diffuse gas constraints” by David Whitworth (ENS Lyon, France) and 6 others based in Australia, Canada, USA, Austria, Mexico and Germany. This article uses pulsar observations that probe the diffuse interstallar medium to extend modelling of the relationship between magnetic field strength and gas number-density. accounting for field geometry. The overlay for this one is here: You can find the officially accepted version on arXiv here and the announcement on Fediverse here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "On the relation between magnetic field strength and gas density in the interstellar medium. II. Density uncertainties and diffuse gas constraints" by David Whitworth (ENS Lyon, France) and 6 others based in Austrailia, Canada, USA, Austria, Mexico and Germany. https://doi.org/10.33232/001c.173229 October 27, 2026, 9:19 am 1 boosts 2 favorites The second paper for this week, published on Wednesday 28th October in the folder Astrophysics of Galaxies, is “The Lifecycle and Emission Properties of PAHs in Cosmological Hydrodynamic Galaxy Formation Simulations” by Desika Narayanan (U. Florida, USA) and 18 others. The study presents the first cosmological model for the evolution and luminous properties of PAHs in galaxies, suggesting that grain-grain shattering in the diffuse ISM primarily drives cosmic PAH abundances. The overlay looks like this: The official version of the paper can be found on arXiv here and the Fediverse announcement here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "The Lifecycle and Emission Properties of PAHs in Cosmological Hydrodynamic Galaxy Formation Simulations" by Desika Narayanan (U. Florida, USA) and 18 others. https://doi.org/10.33232/001c.172863 October 28, 2026, 8:00 am 0 boosts 0 favorites The third paper of the week, published on Wednesday October 28th 2026, is “HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors” by Enrique Pérez-Montero (Instituto de Astrofísica de Andalucía, Spain) and 5 others. This work, published in the folder Astrophysics of Galaxies, extends the HII-CHI-mistry methodology to derive total Sulphur to Hydrogen (S/H) ratios in AGN from optical emission lines through comparison with photoionisation models. The overlay for this is here: The accepted version of this one can be found on the arXiv here and the Mastodon announcement here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors" by Enrique Pérez-Montero (Instituto de Astrofísica de Andalucía, Spain) and 5 others. https://doi.org/10.33232/001c.173273 October 28, 2026, 8:05 am 0 boosts 0 favorites The fourth article of the week, also published on Wednesday 28th October but in the folder High-Energy Astrophysical Phenomena, is “How Common Are Common Envelopes? Quantifying Their Role in Forming Gravitational-Wave Sources” by Floor Broekgaarden (University of California San Diego, USA) and 16 others. This work involves a compilation and systematically comparison of formation-channel predictions from more than 200 isolated-binary population-synthesis simulations, organized within a unified hierarchical system identify the frequency of common-envelope evolution. The overlay is here: The official version of the paper can be found on arXiv here and the Fediverse announcement here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "How Common Are Common Envelopes? Quantifying Their Role in Forming Gravitational-Wave Sources" by Floor Broekgaarden (University of California San Diego, USA) and 16 others. https://doi.org/10.33232/001c.173274 October 28, 2026, 8:10 am 0 boosts 0 favorites The fifth paper of the week, published on Friday 30th October 2026, in the folder Astrophysics of Galaxies, is “From ASTRID to BRAHMA – The role of overmassive black holes in little red dots in cosmological simulations” by Patrick LaChance (Carnegie Mellon U., USA) and 10 others (all based in the USA). Having generated mock JWST observations using the BRAHMA cosmological hydrodynamic simulation, this research explores the possible role of overmassive black holes in the formation of Little Red Dots. The overlay for this one is here: You can find the officially accepted version of this paper on arXiv here and the Mastodon announcement is here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "From ASTRID to BRAHMA – The role of overmassive black holes in little red dots in cosmological simulations" by Patrick LaChance (Carnegie Mellon U., USA) and 10 others (all based in the USA). https://doi.org/10.33232/001c.173389 October 30, 2026, 10:26 am 1 boosts 0 favorites The penultimate, sixth, paper this week is “No Blue without Red: Evolutionary Properties of Super-Early Galaxies” by A. Ferrara (Scuola Normale Superiore, Pisa, Italy) and 5 others based in Italy and China. This was also published on Friday 30th October in the folder Astrophysics of Galaxies. This paper presents an interpretive scheme for the properties of extremely early galaxies highlighting the key role of radiation-driven outflows and indicating how JWST/ALMA observations will provide key tests. The overlay is here: You can find the final version of this paper on arXiv here and the Mastodon announcement here: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: "No Blue without Red: Evolutionary Properties of Super-Early Galaxies" by A. Ferrara (Scuola Normale Superiore, Pisa, Italy) and 5 others based in Italy and China https://doi.org/10.33232/001c.173391 October 30, 2026, 10:55 am 1 boosts 2 favorites The seventh and last paper to report this week is “Automatic astrometric calibration of low-cost all-sky cameras” by J. R. González Fernández (Universidad Internacional de La Rioja, Spain), Laura Hermosa Muñoz (Universidad de Oviedo, Spain) and María Fernández Alonso & Lucía González Cuesta (Allande Stars, Spain). This was published on Friday 30th October in the folder Instrumentation and Methods for Astrophysics. This paper describes an open-source procedure for astrometric calibration that combines a compact fisheye model, an exact rotation to account for camera tilt, and automatic star matching. The overlay for this one is here: The officially accepted version is on arXiv here and this is the Mastodon announcement: Open Journal of Astrophysics [email protected] New Publication at the Open Journal of Astrophysics: Automatic astrometric calibration of low-cost all-sky cameras" by J. R. González Fernández (Universidad Internacional de La Rioja, Spain), Laura Hermosa Muñoz (Universidad de Oviedo, Spain) and María Fernández Alonso & Lucía González Cuesta (Allande Stars, Spain) https://doi.org/10.33232/001c.173392 October 30, 2026, 11:08 am 1 boosts 1 favorites That concludes this week’s update. There was an interruption in publishing on Thursday 29th October as arXiv did not update on that day owing to its migration into the cloud. Anyway, we have now published over 700 papers in total. So far this year we have published 256, with 10 of the 12 months now complete. A rough estimate would take us to about 307 by the end of the year. We have in fact published more than 300 papers since this time last year. I’ll do another update next week. https://telescoper.blog/2026/10/31/weekly-update-from-the-open-journal-of-astrophysics-31-10-2026/ #openjournal #astrophysics #weeklyupdate #usa #october #enslyon #galaxies #davidwhitworth #newpublication #desikanarayanan #rss #feeds #linksharing #qwibbit

Netherland, by Joseph O’Neill I bought the book Netherland, by Joseph O’Neill, ages ago when I was still living in Cardiff, around 2010, but somehow I never got around to reading it until now. It’s an intriguing book, written by an Irishman about a Dutchman who spends his life between London and New York, and who loves cricket. I don’t know why I put off reading it for so long, but I definitely recommend it. It’s full of vivid descriptions of places and acutely observed people. The jacket blurb for this novel does give the impression that it is some sort of murder mystery involved, and it the story is in a sense stimulated by the discovery of the body in a New York canal found with its hands tied behind its back. This event provokes the narrator and principal protagonist, Hans van den Broek, to reflect on the time he spent in New York in the immediate aftermath of the 9/11 attacks. The man in the canal was Chuck Ramkissoon, a larger-than-life self-styled “businessman” who had befriended Hans in those days. They had met through a common interest in cricket; Chuck had grandiose plans to build a cricket stadium in New York. The narrative unfolds in flashbacks, partly about Hans’s childhood in The Hague, partly in London working in the City, partly about the ups and downs of his marriage to a lawyer called Rachel, and partly about Chuck Ramkissoon. We gradually realize that Chuck is a very shady character, perhaps more of a gangster than a businessman, whose death was probably gang-related. But while these topic are woven into the narrative, Netherland is not really about them. It is really a contemplation of memory and personality and relationships and how these things are changed by events that you can’t control. I dare say many people found themselves and those to whom they were close unaccountably changed by 9/11. The novel probes the narrator’s sense of alienation as he comes to terms with the fact that while in New York he is in a kind of exile from himself. That sense is elevated by the way the narrative jumps backwards and forwards, as if the narrator is searching his memories for things to hold on to. Most people in this novel, including the narrator, his wife Rachel, Chuck Ramkissoon, and a host of minor characters are basically unknowable and the author’s relationships with them always ambivalent. The only really constant factor are his love for his young son, Jake – the understated expressions of the unconditional affection he feels for his little boy are very moving – and for cricket. What I thought would be a murder mystery, actually turned out to be a kind of love story… https://telescoper.blog/2026/10/30/netherland-by-joseph-oneill/ #newyork #chuckramkissoon #netherland #hans #london #rachel #rss #feeds #linksharing #qwibbit

Scary Picture Puzzle With Halloween approaching I thought I’d post some scary paintings, and then thought I’d post just two and turn the post into a little art quiz. Other than both being scary, and both featuring severed heads, can you spot the connection between them? And please try to answer without using an AI assistant or other form of cheating. Picture number one, on the left, is The Severed Heads by Théodore Géricault (c. 1810, Oil on Canvas, 61cm x 50cm, National Museum in Stockholm). Picture number two, on the right, is Medusa by Michelangelo Merisi da Caravaggio – Caravaggio to you – (c. 1597, Oil on Canvas, mounted on wood, 60 cm × 55 cm, Uffizi Gallery, Florence). https://telescoper.blog/2026/10/29/scary-picture-puzzle/ #scary #severedheads #canvas #oil #theodoregericault #nationalmuseum #uffizigallery #caravaggio #michelangelomerisi #florence #rss #feeds #linksharing #qwibbit

From Belfast So here I am, back in Maynooth. I’d like to thank the members of the Astronomy Research Centre in the School of Mathematics and Physics at Queen’s University Belfast for inviting me and for stimulating discussions during and after my talk, and of course for the hospitality, especially the nice lunch and tea & cakes this afternoon. The hotel I stayed in last night is very close to the campus, in the University quarter, and I got up early enough this morning to have a very substantial breakfast and walk some of it off by going around the campus before my talk. I took few snaps to prove I was there. As you can see, it has a strong “red-brick” vibe about it and more than a hint of Gothic Revival, although unlike’s Maynooth’s version of that style, QUB has a Tudor tinge. My talk was in the buidling on the right, with the extravagant doorway/entrance hall, which is obviously of more modern design. Anyway, a nice time having been had, I made my way back to Belfast Grand Central Station for the train home. This time we had a proper train which was actually big enough to accommodate all the passengers booked on it, and the seat reservations were showing. All went well until we reached Dundalk (in the Republic) when the train stopped and officers of An Garda Síochána went through the train demanding to see everyone’s passport. I was shocked. I couldn’t help thinking of ICE in America, or even the Gestapo on which they are modelled. Nobody told me that I had to carry a passport on a train between Belfast and Dublin, so I never thought about taking mine with me on this trip. It was only by sheer fluke that it happened to be in the pocket of my jacket, which I had been wearing last time I needed a passport. I started to wonder what would have happened had I not had it with me, and then I thought they would probably have done nothing. After all, I am white… The Common Travel Area has been steadily eroded over the years. Dublin Airport has long required passengers from the UK to go through immigration control (which it shouldn’t according to the CTA). More recently – since the end of September 2026 – ferry services between Ireland and Britain have started requiring passports to be carried. I never expected, though, that measures would be taken by the Irish side to effectively create a hard border on the island of Ireland. I don’t know when this policy was introduced. At the very least, Iarnród Éireann should warn passengers using the Enterprise service that they now need to take their passports with them. I wasn’t asked to show my passport on the outbound leg. There’s no passport control when flying from Dublin to the UK, either. The search for migrants having been completed, the Gardaí alighted from the train and we carried on to Dublin, with a delay which meant I missed my connection to Maynooth. That wasn’t a significant problem, however, because I got on the next train, which was bound for Sligo and which gets to Maynooth significantly faster than the usual commuter trains, so it wasn’t too convenient. https://telescoper.blog/2026/10/28/from-belfast/ #belfast #universitybelfast #maynooth #dublin #gothicrevival #ireland #grandcentral #rss #feeds #linksharing #qwibbit

To Belfast The last time I attempted to travel to Belfast to give a seminar, in 2019, it didn’t go very well. This time it went better, in the sense that I’ve actually arrived in Belfast. The Enterprise service between Dublin and Belfast has doubled in frequency since 2019 and the price is still modest, just €17.50 each way, including a seat reservation, which is the full fare standard price. Unfortunately the train that arrived in Dublin to take us to Belfast was much smaller than the regular one – only four carriages, presumably owing to a fault on one of the usual trains, so it was crammed – and there were no seat reservations on it. I did find a seat but many people didn’t and had to stand. The train started to empty at Dundalk and by Newry most people could sit down. Other than that, it was fine. The trip from Dublin Connolly to Belfast Grand Central took about 2 hours and 10 minutes, by the way, which. You would be hard pressed to make a two-hour journey by train in England for the equivalent price. I’ve successfully visited Belfast a few times over the past few years, actually, but not for work reasons. It’s quite chilly in Belfast tonight, a good few degrees colder than Dublin, but my hotel room is warm, and being on my own I think I’ll just stay in and finish the book I’m reading. I’ll get up early, hopefully to publish a few OJAp papers, have a cooked breakfast and then venture forth to find Queen’s University Belfast, which I failed to visit in 2019: https://telescoper.blog/2026/10/27/to-belfast/ #belfast #dublin #universitybelfast #dublinconnolly #grandcentral #newry #rss #feeds #linksharing #qwibbit

A Critique of University Marketing I bookmarked a story in the Times Higher a couple of weeks ago, with the intention of doing a post about it, and then promptly forgot. Such is the effect of old age. Anyway the story is about the the fact that Lancaster University is undertaking a disciplinary investigation into one of its staff, Mike Ryder, who wrote a blog post of his own with the title Why are universities so bad at marketing? I’ve linked to it in order to boost its readership. He’s also done a video with the same title: The point of me repeating this here is twofold. The first is to point out that investigating an academic for daring to express an opinion is disgraceful, contrary to the principles of academic freedom, and symptomatic of the authoritarian attitude that pervades the modern university system. The second point concerns my own institution, Maynooth University in Ireland. I know I have, in the past been critical of many aspects of this University’s governance, but in this respect I give credit where it is due. Maynooth does not indulge in pointless marketing. In fact, as far as I can tell, it does not indulge in any marketing whatsoever. I’m sure I speak for a majority of the staff when I say that we are all proud to work in an institution that does not sully its hands with such vulgar activities. https://telescoper.blog/2026/10/27/a-critique-of-university-marketing/ #university #marketing #timeshigher #lancasteruniversity #mikeryder #maynoothuniversity #rss #feeds #linksharing #qwibbit

Lá Saoire i mí Dheireadh Fómhair Today being the last Monday of October, it’s a Bank Holiday here in Ireland – Lá Saoire i Mí Dheireadh Fómhair (literally, the Holiday at the End of the Month of October) so I had the morning off; I have a telecon this afternoon. This week is Study Week too so there are no lectures or tutorials until next Monday, when we resume for the seven remaing weeks of the Semester. I’ll be travelling tomorrow to give a seminar at Queen’s University Belfast. My talk will have the title Open Access Publishing in Astrophysics and the Open Journal of Astrophysics, an updated version of a talk I’ve given in a number of places. over the past few years. I was looking at NASA/ADS just now to get the latest statistics and discovered that articles in the Open Journal of Astrophysics have now received over 10,000 citations at an average of 14.9 per paper. The average has been consistent since the first few years of publishing, which is interesting for the reason that our publishing rate is rising steadily so that most of our publications are very recent. Anyway, I’m quite looking forward to the trip. The worst of the awful weather of the past few days seems to have passed and I hope I can make it to and from Belfast by train without the intervention of floods or fallen trees. Another name for the present Bank Holiday is Lá Saoire Oíche Shamhna (Halloween Holiday), although Halloween itself does not occur until Saturday. I’ll be travelling again at the weekend, but this time purely for pleasure. At this time of year many of the buildings of the historic South Campus are ablaze with Red Virginia Creeper: It’s very pretty, but not good for the brickwork! https://telescoper.blog/2026/10/26/la-saoire-i-mi-dheireadh-fomhair-2/ #dheireadhfomhair #saoire #openjournal #bankholiday #astrophysics #october #openaccess #halloweenholiday #monday #universitybelfast #rss #feeds #linksharing #qwibbit

From Fermi to Dirac I was just reminded that exactly 100 years ago today, Enrico Fermi wrote this famous letter to Paul Dirac: That’s why we call them Fermi-Dirac Statistics! P.S. It seems that Enrico Fermi wasn’t too handy with a typewriter. https://telescoper.blog/2026/10/25/from-fermi-to-dirac/ #dirac #pauldirac #fermi #enrico #statistics #rss #feeds #linksharing #qwibbit

Notts in the Eye My former colleague at Nottingham University, Philip Moriarty, alerted me to a piece in the latest Private Eye (No. 1686) about the parlous state of affairs there. The teaser on the left shows a bit more than Philip did in his post, but if you want to read the rest you should buy a copy of the Eye. Next to the story about Nottingham University, you will find one about Edinburgh University, which you will want to read if you work there… The video that appeared in a previous post about Nottingham University has been taken down. I’m not really surprised, because it shows the University Management in a very poor light and we can’t have that, can we? I have heard stories about how bad the situation is at Nottingham University. Apparently some members of staff are being told that they have to reapply for the jobs they currently hold and will have to do the same every year for the next three years. This is a disgraceful way to treat academic staff, but remember that this crisis was entirely caused by University Management, not the academic or other staff who are bearing the brunt of the cuts. There may be massive job cuts among ordinary staff at the University of Nottingham, but there’s still money for three new Pro-Vice-Chancellor positions there. The purpose of these positions is “explained” in the following blurb that consists of the sort of vacuous nonsense such advertisements: Our proposed transition from five faculties to three colleges will strengthen collaboration, support academic excellence and position Nottingham for long-term success. We are recruiting a Pro-Vice-Chancellor for each of the College of Humanities and Social Sciences, College of Health, and College of Science and Engineering. Each will bring together complementary disciplines, creating new opportunities for interdisciplinary education and research, knowledge exchange and external partnerships. Joining at this formative stage, you will shape your college’s strategy, identity and culture, building on established strengths while opening new possibilities for its staff and students. As a member of the University Executive Board, you will contribute to institutional strategy and decision-making, working collaboratively with your fellow College Pro-Vice-Chancellors to advance the success of the whole university while taking executive responsibility for your college’s performance and development. You will lead excellence in education and student experience, research and knowledge exchange, supported by a coherent and sustainable academic portfolio and effective stewardship of resources. You will shape student growth, recruitment priorities and the long-term academic direction of the college. You will foster a culture of accountability and be responsible for delivering measurable improvements in academic and financial performance against institutional priorities and key performance indicators. Working closely with academic and professional services colleagues across our global campuses, you will lead change, strengthen financial sustainability and build partnerships that enhance Nottingham’s reputation and impact locally, nationally and internationally. We are looking for accomplished senior leaders who combine strategic vision with a record of delivering change and improving performance. You will bring the communication and interpersonal skills to build trust, navigate difficult conversations and inspire colleagues through change, alongside a demonstrable commitment to equality, diversity and inclusion. Above all, you will be committed to creating an environment in which colleagues and students can succeed, and to advancing the university’s ambitions through partnership, innovation and shared purpose. If you share our values of inclusivity, ambition, openness, fairness and respect, we invite you to help shape the future of Nottingham I laughed out loud when I read “foster a culture of accountability”. I suppose that phrase does represent an admission that they don’t have one at the moment. I wonder why they need a Senior Management team at all. The Eye story confirms the fact that all Nottingham University’s “strategic” decisions are made – at great expense – by management consultants. Of course they are looking to a recruitment agency to fill these posts, so they’ll be fishing in the same pool that supplied such quality material for their previous management team – the one that bankrupted the University. Based on the above blurb, it looks like the three new College PVCs will replace five existing Faculty PVCs. Why could that not have been done through an internal process, which would have spared the considerable expense of resorting to a recruitment agency? This sums up everything that it wrong with modern university “governance” – a jamboree for self-serving careerist types and austerity for everyone else. It has to stop. https://telescoper.blog/2026/10/25/notts-in-the-eye/ #nottinghamuniversity #eye #privateeye #college #edinburghuniversity #philipmoriarty #management #socialsciences #executive #rss #feeds #linksharing #qwibbit

Thibaut Garcia at the National Concert Hall Last night I travelled into Dublin for another concert by National Symphony Orchestra Ireland, this time under the direction of guest conductor Julio García Vico in a programme of music heavy with French and Spanish influences. The undoubted star of the show was classical guitarist Thibaut Garcia, who is French but has Spanish ancestry, who played the Concierto de Aranjuez by Joaquin Rodrigo. I’ve loved this piece for ages, and have several recordings of it, but although it’s been a familiar part of the concert repertoire ever since it was composed in 1939, I’ve never heard it played live. Last night’s performance was stunningly beautiful, one of those occasions on which it was a privilege just to be there. I loved the way he played the first movement Allegro con Spirito with poise and precision but without a hint of punctiliousness. The famous second movement Adagio gives the soloist much more latitude for interpretation, and Garcia’s version was very different from others I’ve heard. The music here evokes a sense of nostalgia, which comes with both joy and melancholy. I think in too many performances melancholy has the upper hand, but last night we really felt the joy. The final movement, Allegro gentile, contains a playful series of call-and-answer sequences set against varied rhythmic backgrounds. I adored this performance. I noticed while he was playing that Thibaut Garcia has hyperextensible thumbs (as do I) and, as I went to the bar for my interval drink, I found myself wondering whether having bendy thumbs was an advantage for playing classical guitar. You could have knocked me down with a feather when, as I was returning to my seat after the wine break, that the man himself was sitting in the seat right behind mine preparing to listen to the second half of the concert. I couldn’t resist telling him how much I enjoyed the performance and mentioned his thumbs. It must be very irksome for an artist when strange people intrude awkwardly like that, but he was absolutely charming. After a brief comparison of thumbs, I sat down and left him alone. I was too starstruck to ask him whether distal hyperextensibility is a plus when it comes to playing the guitar. Perhaps someone can offer an opinion through the comments? Anyway, it would be remiss not to mention the rest of the programme, which contained a great of interest. The first piece, for example, Laniakea by Camille Pépin is inspired by our Local Supercluster of galaxies which astronomers have named Laniakea, an Hawaiian word meaning “immeasurable heaven”. The programme after the interval contained energetic and colourful performances of music from the opera La Vida Breve by Manuel de Falla, the Capriccio Espagnol by Nikolai Rimsky-Korsakov and, for the finale, the famous Bolero by Maurice Ravel. All these were played very well, but the first half was so wonderful that it was always going to be impossible for the second half to match it. https://telescoper.blog/2026/10/24/thibaut-garcia-at-the-national-concert-hall/ #thibautgarcia #concerthall #nationalconcert #nationalsymphony #orchestraireland #garciavico #juliogarcia #joaquinrodrigo #spanish #rss #feeds #linksharing #qwibbit