MUSE maps spiral galaxy W2246f, uncovering old core and ongoing star formation across disk

Phys · Jun 06, 2026 · 598 words · By Tomasz Nowakowski

headphones Listen to the eFinder podcast briefing

Ready to play

Daily briefing

What to know about MUSE maps spiral galaxy W2246f, uncovering old core and ongoing star formation across disk

Astronomers used the Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope to study the spiral galaxy W2246f. The study analyzed stellar and gas kinematics, concluding that the galaxy is a central low-ionization emission-line region (cLIER) galaxy with an old core and ongoing star formation in its disk.

Propaganda risk 0%

Claims checked 14

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left14%

Center72%

Right14%

7 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

June 6, 2026 report MUSE maps spiral galaxy W2246f, uncovering old core and ongoing star formation across disk Tomasz Nowakowski Author Sadie Harley Scientific Editor Robert Egan Associate Editor Astronomers have employed the Multi-Unit Spectroscopic Explorer…

Why it matters

Results of the observational campaign, published May 27 on the pre-print server arXiv, offer new insights into how this galaxy evolved and shed more light on its nature.

Common ground

A mystery in the foreground W2246f, also known as Leda 1044720, is a spiral galaxy located some 1.2 billion light years away.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: MUSE maps spiral galaxy W2246f, uncovering old core and ongoing star formation across disk?
What evidence would most clearly confirm or weaken the claim that an international group of astronomers led by Evelyn J. Johnston of the Diego Portales University in Chile decided to employ MUSE to investigate this galaxy in detail?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-06-muse-spiral-galaxy-w2246f-uncovering.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 14 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 4

info Single Source 4

check_circle Corroborated 3

help Insufficient Evidence 2

verified Verified 1

check_circle

Claim 1: “an international group of astronomers led by Evelyn J. Johnston of the Diego Portales University in Chile decided to employ MUSE to investigate this galaxy in detail.”

CORROBORATED

Multiple sources identify Evelyn J. Johnston as the lead author/researcher of the study on W2246f using MUSE.

travel_explore

web search NEUTRAL — Johnston's team used the collected MUSE data to carry out analysis of the stellar and gas kinematics, the stellar populations and the gas properties to better understand the nature of W2246f in the fi…
https://phys.org/news/2026-06-muse-spiral-galaxy-w2246f-unco…

travel_explore

web search NEUTRAL — Johnston et al: A deep study of the spiral galaxy W2246f. guish between Seyferts and LINERS, but in the diagram shown in the middle panel of Fig. 6 it can be seen that all the line ra-tios from across…
https://www.aanda.org/articles/aa/pdf/forth/aa60281-26.pdf

travel_explore

web search NEUTRAL — We conclude that W2246f is a nice example of a cLIER galaxy, where the central kpc is dominated by old, metal-poor stars with little star formation.View a PDF of the paper titled A Deep Study of the S…
https://arxiv.org/abs/2605.29014

schedule

Claim 2: “the authors of the paper conclude that their findings point to a central low-ionization emission-line region (cLIER) galaxy classification for W2246f.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 3: “the central kpc or so is dominated by old, metal-poor stars with little star formation and where the central LIER emission is primarily powered by hot evolved (pAGB) stars, while the rest of the disk is displaying ongoing star formation”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 4: “the mass-weighted metallicities in the inner part of W2246f show a slight positive gradient before decreasing again throughout the rest of the disk.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info

Claim 5: “the astronomers found no obvious signs of distortion. This suggests that it is unlikely that W2246f has undergone a recent interaction within the last 1 billion years.”

SINGLE SOURCE

The claim about no obvious signs of distortion and the 1 billion year interaction window is mentioned in one web source. Other sources discuss morphology but not this specific conclusion.

travel_explore

web search NEUTRAL — The first step in the analysis of W2246f was to consider its morphology and physical properties. As can be seen in Fig. 1, W2246f is a flocculent spiral galaxy of class Sc, based on a visual inspectio…
https://www.aanda.org/articles/aa/full_html/2026/07/aa60281-…

travel_explore

web search NEUTRAL — Numerical analysis of small Arctic diatoms (Bacillariophyceae) representing...
https://www.tandfonline.com/action/showAxaArticles?journalCo…

travel_explore

web search NEUTRAL — Billions. It’s a fun word to say. Rolls right off the tongue. Go ahead, try it. “Billions.”
https://www.youtube.com/watch?v=u_aLESDql1U

info

Claim 6: “W2246f, also known as Leda 1044720, is a spiral galaxy located some 1.2 billion light years away.”

SINGLE SOURCE

Only one specific web source ('MUSE maps spiral galaxy W2246f...') explicitly mentions the name Leda 1044720 and the distance of 1.2 billion light years. Other sources discuss the galaxy but not these specific identifiers/metrics.

travel_explore

web search NEUTRAL — Two smaller galaxies and several dwarf galaxies in the Local Group orbit the Milky Way. The largest of these is the Large Magellanic Cloud with a diameter of 32,200 light-years.[292] It has a close co…
https://en.wikipedia.org/wiki/Milky_Way

travel_explore

web search NEUTRAL — W2246f, also known as Leda 1044720, is a spiral galaxy located some 1.2 billion light years away.This suggests that it is unlikely that W2246f has undergone a recent interaction within the last 1 bill…
https://phys.org/news/2026-06-muse-spiral-galaxy-w2246f-unco…

travel_explore

web search NEUTRAL — The two galaxies have a separation on sky of ∼ 19.5′′, which corresponds to a physical separation on sky of ∼ 35.5 kpc at the distance of W2246f. Taking into account their distances from us, we found …
https://arxiv.org/pdf/2605.29014

info

Claim 7: “The galaxy is about 50,000–70,000 light years in diameter”

SINGLE SOURCE

The provided evidence for this claim consists of general definitions of 'diameter' from Wikipedia and other guides, but no specific data regarding the diameter of galaxy W2246f.

travel_explore

web search NEUTRAL — This includes hydraulic diameter, the equivalent diameter of a channel or pipe through which liquid flows, and the Sauter mean diameter of a collection of particles. The diameter of a circle is exactl…
https://en.wikipedia.org/wiki/Diameter

travel_explore

web search NEUTRAL — Oct 22, 2025 · Diameter is a specific circle measurement; it’s the distance across a circle through the center. Width can describe how wide something is in general, and it doesn’t always have to go th…
https://www.mathnasium.com/blog/diameter-guide

travel_explore

web search NEUTRAL — Diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circumference of a circle. Learn how to find the diameter of a circle usin…
https://www.cuemath.com/geometry/diameter/

help

Claim 8: “This finding indicates that W2246f formed the majority of its mass about 6–7 billion years ago.”

INSUFFICIENT EVIDENCE

No evidence was provided or found in the search results regarding the formation time of W2246f's mass.

verified

Claim 9: “The observations with MUSE were carried out between July and September 2022.”

VERIFIED

A specific research paper/abstract explicitly states that the data were observed between July and September 2022, citing specific program IDs.

travel_explore

web search NEUTRAL — In this paper we present a deep study of the spiral galaxy W2246f with MUSE, exploring the spatially resolved stellar and ionised gas properties to understand how it formed and evolved over time.
https://www.aanda.org/articles/aa/full_html/2026/07/aa60281-…

travel_explore

web search NEUTRAL — at 9300 Å. The data were observed between July and September 2022 as part of program IDs 106.21F0.001 (PI Diaz-Santos) and 109.2393.001 (PI Assef).Figure 1: Images of W2246f and its companion galaxy t…
https://arxiv.org/html/2605.29014

help

Claim 10: “They found that the galaxy shows relatively old mass-weighted ages across the whole system, with older ages in the bulge-dominated region at the center and no strong gradient across the disk.”

INSUFFICIENT EVIDENCE

No evidence was provided or found in the search results regarding the mass-weighted ages or gradients of W2246f.

check_circle

Claim 11: “Astronomers have employed the Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) to perform deep spectroscopic observations of a peculiar spiral galaxy known as W2246f.”

CORROBORATED

Multiple web sources confirm that astronomers used the MUSE instrument on the VLT to observe the spiral galaxy W2246f. Wikipedia also confirms the existence and function of MUSE and VLT.

menu_book

wikipedia NEUTRAL — The Very Large Telescope (VLT) is an astronomical facility operated since 1998 by the European Southern Observatory, located on Cerro Paranal in the Atacama Desert of northern Chile. It consists of fo…
https://en.wikipedia.org/wiki/Very_Large_Telescope

menu_book

wikipedia NEUTRAL — Leibniz Institute for Astrophysics Potsdam (AIP) is a German research institute. It is the successor of the Berlin Observatory founded in 1700 and of the Astrophysical Observatory Potsdam (AOP) found…
https://en.wikipedia.org/wiki/Leibniz_Institute_for_Astrophy…

menu_book

wikipedia NEUTRAL — The Multi-Unit Spectroscopic Explorer (MUSE) is an integral field spectrograph installed at the Very Large Telescope (VLT) of the European Southern Observatory (ESO). It operates in the visible wavele…
https://en.wikipedia.org/wiki/Multi-Unit_Spectroscopic_Explo…

+ 3 more evidence sources

schedule

Claim 12: “the gas metallicity and star formation rate density also drop in the central region of W2246f”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

check_circle

Claim 13: “Results of the observational campaign, published May 27 on the pre-print server arXiv”

CORROBORATED

Two independent web sources explicitly state the results were published on the arXiv pre-print server on May 27. A third source mentions an acceptance date of May 27, 2026.

travel_explore

web search NEUTRAL — The results were published on May 27 on the arXiv pre-print server, meaning they had not yet undergone formal peer review at the time of release.
https://www.squaredtech.co/spiral-galaxy-w2246f-mapped-new-r…

travel_explore

web search NEUTRAL — Results of the observational campaign, published May 27 on the pre-print server arXiv, offer new insights into how this galaxy evolved and shed more light on its nature.
https://phys.org/news/2026-06-muse-spiral-galaxy-w2246f-unco…

travel_explore

web search NEUTRAL — Received: 7 April 2026 Accepted: 27 May 2026. Abstract. Aims. In this era of large surveys and statistical studies of galaxies, the beauty in the details of individual galaxies is often lost.
https://www.aanda.org/articles/aa/full_html/2026/07/aa60281-…

info

Claim 14: “lies in the foreground of WISE J224607.57−052635.0—a hot, dust-obscured galaxy at a redshift of 4.6.”

SINGLE SOURCE

The search results for this claim are completely irrelevant, discussing a foundation in Chile (Fundación Chinquihue) rather than the astronomical object WISE J224607.57-052635.0.

travel_explore

web search NEUTRAL — Dec 23, 2020 · La infraestructura se ubica en dependencias de Fundación Chinquihue y su construcción fue posible gracias a fondos del Gobierno Regional de Los Lagos. Con el fin de conocer de primera m…
https://www.fundacionchinquihue.cl/tag/sala-de-procesos/

travel_explore

web search NEUTRAL — Fundación Chinquihue promueve y contribuye a la estrategia de desarrollo pesquero artesanal, generando condiciones que favorezcan su sostenibilidad.
https://www.fundacionchinquihue.cl/

travel_explore

web search NEUTRAL — Mar 9, 2026 · Por Comunicaciones Fundacion Chinquihue Publicado el marzo 9, 2026 Publicada en Noticias Etiquetada como Acuicultura de pequeña escala, Fundación Chinquihue, Pesca Artesanal, Universidad…
https://www.fundacionchinquihue.cl/tag/pesca-artesanal/

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.