Weekly Update at the Open Journal of Astrophysics – 15/03/2025

The Ideas of March are come, so it’s time for another update of papers published at the Open Journal of Astrophysics. Since the last update we have published two papers, which brings the number in Volume 8 (2025) up to 27 and the total so far published by OJAp up to 262.

The first paper to report is “Dark Energy Survey Year 6 Results: Point-Spread Function Modeling” by Theo Schutt and 59 others distributed around the world, on behalf of the DES Collaboration. It was published on Wednesday March 12th 2025 in the folder Cosmology and NonGalactic Astrophysics. It discusses the improvements made in modelling the Point Spread Function (PSF) for weak lensing measurements in the latest Dark Energy Survey (6-year) data and prospects for the future.

Here is the overlay, which you can click on to make larger if you wish:

You can read the officially accepted version of this paper on arXiv here.

The other paper published this week is “Exploring Symbolic Regression and Genetic Algorithms for Astronomical Object Classification” by Fabio Ricardo Llorella (Universidad Internacional de la Rioja, Spain) & José Antonio Cebrian (Universidad Laboral de Córdoba, Spain), which came out on Thursday 13th March. This one is in the folder marked Astrophysics of Galaxies and it discusses the classification of astronomical objects in the Sloan Digital Sky Survey SDSS-17 dataset using a combination of Symbolic Regressiion and Genetic Algorithms.

The overlay can be seen here:

You can find the “final” version on arXiv here.

That’s it for this week. I’ll have more papers to report next Saturday.

#arXiv250105781v2 #arXiv250309220v1 #AstronomicalObjectClassification #AstrophysicsOfGalaxies #CosmologyAndNonGalacticAstrophysics #DarkEnergySurvey #DES #DiamondOpenAccess #GeneticAlgorithms #OpenAccessPublishing #SloanDigitalSkySurvey #SymbolicRegression #TheOpenJournalOfAstrophysics #weakGravitationalLensing

#AIP:
"
Mit .. Blick auf d. kosmischen Tanz d. Sterne hat ein Team .. d. komplizierte Struktur unserer Milchstraße entschlüsselt. Unter d. Annahme, dass jeder beobachtete Stern eine größere Population v. Sternen mit derselben Umlaufbahn repräsentiert, haben sie d. Eigenschaften dieser verborgenen Sterne rekonstruiert u. damit Lücken im Wissen über unsere galaktische Scheibe gefüllt, ..
"
https://www.aip.de/de/news/unveiling-the-uncharted-milky-way/

19.12.2024

#APOGEE #Astronomie #Galaxie #Milchstraße #SloanDigitalSkySurvey #Sterne

One of my favorite sequences from the film, we just got everything right, from volunteer Judy Schmidt's amazing Hubble image processing work to the rest of the teams' image processing to the multiplane, it's one of the most beautiful shots in the film in full motion.

#hubble #hubbletelescopeimage #sloandigitalskysurvey #multiplane #multiplanecamera #insaturnsrings

Several people have been asking about the how the five million galaxies was done. There is a long article on the website but also I (Stephen V. Stone) did a TEDx talk about it back in 2018 https://www.ted.com/talks/stephen_van_vuuren_7_5_million_photographs_from_space?subtitle=en

#tedx #tedxtalks #tedxtalk #sloandigitalskysurvey #insaturnsrings

So we talk about those 5 million galaxies a lot. Here's a closers look - a 100% scale of one part, about 50,000 galaxies. Each tiny spec here is an actual photograph of galaxy from the Sloan Digital Sky Survey that we arranged to scientifically match its actual position in the universe. Later this month we will release the full 5 million galaxy shot in 8K!

#sloandigitalskysurvey #insaturnsrings #deepspace