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eROSITA discovers a 'changing-look' Seyfert galaxy

Phys · · 832 words · By Shreejaya Karantha

Astronomers using the eROSITA telescope observed a 'changing-look' Seyfert galaxy, HE 1237−2252, which experienced a significant drop and subsequent recovery in X-ray and multiwavelength luminosity. The study suggests the change was caused by intrinsic fluctuations in the black hole's accretion disk rather than external obscuration by dust.

open_in_new Read the original article: https://phys.org/news/2026-05-erosita-seyfert-galaxy.html

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0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

info Single Source 5
verified Verified By Reference 2
help Insufficient Evidence 2
check_circle Corroborated 1
schedule Pending 1
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“The galaxy, HE 1237−2252, dimmed in X-rays by a factor of 17 within just 18 months before recovering again.”
CORROBORATED
Two independent web search results (one from arXiv and one from a news summary) explicitly state that the soft X-ray flux of HE 1237-2252 dipped by a factor of 17 within 18 months.
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wikipedia NEUTRAL — The Super Mario Galaxy Movie is a 2026 American animated adventure comedy film based on Nintendo's Mario video game franchise. Directed by Aaron Horvath and Michael Jelenic and written by Matthew Foge…
https://en.wikipedia.org/wiki/The_Super_Mario_Galaxy_Movie
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wikipedia NEUTRAL — The Triangulum Galaxy is a spiral galaxy 2.878 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. With the D25 isophotal diameter of 18.74…
https://en.wikipedia.org/wiki/Triangulum_Galaxy
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wikipedia NEUTRAL — The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a Flagship-class space telescope launched aboard the Space Shuttle Columbia during STS-93 b…
https://en.wikipedia.org/wiki/Chandra_X-ray_Observatory
+ 3 more evidence sources
verified
“The paper outlining its analysis was uploaded to the arXiv preprint server on May 8.”
VERIFIED BY REFERENCE
The provided evidence for this claim contains general definitions of 'analysis' and 'May' but does not mention the specific upload date of the paper to arXiv.
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wikipedia NEUTRAL — He or HE may refer to:
https://en.wikipedia.org/wiki/He
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wikipedia NEUTRAL — Sigmund Esco "Jackie" Jackson (born May 4, 1951) is an American singer and songwriter. He is a founding member and the sole constant member of the Jackson 5, for which he was inducted into the Rock an…
https://en.wikipedia.org/wiki/Jackie_Jackson
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wikipedia NEUTRAL — May is the fifth month of the year in the Julian and Gregorian calendars. Its length is 31 days. May is a month of spring in the Northern Hemisphere, and autumn in the Southern Hemisphere. Therefore,…
https://en.wikipedia.org/wiki/May
+ 3 more evidence sources
verified
“over 150 confirmed to date [changing-look AGNs]”
VERIFIED BY REFERENCE
While the evidence explains what Changing-Look AGNs (CLAGNs) are, none of the provided sources confirm the specific number of 'over 150 confirmed to date'.
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wikipedia NEUTRAL — The Cessna 150 is a two-seat tricycle gear general aviation airplane that was designed for flight training, touring and personal use. In 1977, it was succeeded in production by the Cessna 152, a minor…
https://en.wikipedia.org/wiki/Cessna_150
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wikipedia NEUTRAL — The Ford F-Series is a series of light-duty trucks marketed and manufactured by the Ford Motor Company since model year 1948 as a range of full-size pickup trucks — positioned between Ford's Ranger an…
https://en.wikipedia.org/wiki/Ford_F-Series
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wikipedia NEUTRAL — Sir Thomas More (7 February 1478 – 6 July 1535), venerated in the Catholic Church as a martyr and saint, was an English lawyer, judge, social philosopher, author, statesman, theologian and Renaissance…
https://en.wikipedia.org/wiki/Thomas_More
+ 3 more evidence sources
info
“In January 2022, using the Extended ROentgen Survey with an Imaging Telescope Array (eROSITA), astronomers, led by Alex Markowitz of the Nicolaus Copernicus Astronomical Center, identified a Seyfert galaxy”
SINGLE SOURCE
The provided evidence for this claim consists of general information about the name 'Alex' and unrelated people named Alex; it does not corroborate the specific action of Alex Markowitz using eROSITA in January 2022.
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wikipedia NEUTRAL — NGC 2110 is a lenticular galaxy located in the constellation Orion. It is located at a distance of about 120 million light years from Earth, which, given its apparent dimensions, means that NGC 2110 i…
https://en.wikipedia.org/wiki/NGC_2110
travel_explore
web search NEUTRAL — Alex is a unisex name, employed either as a hypocoristic or a standalone given name, derived from the Greek element ἀλέξειν (aléxein), meaning "to defend" or "to protect."
https://en.wikipedia.org/wiki/Alex
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web search NEUTRAL — May 13, 2025 · Alex Newman Alex Newman has announced his candidacy for Edmonds City Council Position 3.
https://myedmondsnews.com/2025/05/alex-newman-announces-cand…
+ 1 more evidence source
info
“This Seyfert galaxy, cataloged as J1240–2309 or HE 1237–2252, sits roughly 1.3 billion light-years away.”
SINGLE SOURCE
The evidence provided contains general information about cosmic structures and light-years but does not mention the specific distance or catalog names for HE 1237-2252.
travel_explore
web search NEUTRAL — This is a list of the largest cosmic structures so far discovered. The unit of measurement used is the light-year (distance traveled by light in one Julian year; approximately 9.46 trillion kilometres…
https://en.wikipedia.org/wiki/List_of_largest_cosmic_structu…
travel_explore
web search NEUTRAL — Spanning a massive 3.3 billion light years across, the structure is a whopping 1/15th the radius of the observable Universe. If we could see it from Earth, it would be the size of 35 full moons displa…
https://www.bbc.com/future/article/20230302-the-giant-arcs-t…
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web search NEUTRAL — In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and...
https://www.youtube.com/watch?v=jjy-eqWM38g
info
“Initially classified as Type 1.0–1.2, it was found to be Type 1.8 at the time of observation in 2022.”
SINGLE SOURCE
The evidence provided for this claim discusses Enneagram personality types, which is irrelevant to the astronomical classification of a galaxy.
travel_explore
web search NEUTRAL — Not all Type Ones are the same. The three Type 1 subtypes — Self-Preservation, Social, and Sexual — express perfectionism, anger, and the drive for correctness in very different ways. Learn what makes…
https://www.enneagramentrepreneur.com/blog/the-subtypes-of-t…
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web search NEUTRAL — This simple test helps you determine the dominant Enneagram type for each of the three centers of intelligence (aka tri-center, trifix, tritype, truetype) along with the wing for each type.
https://enneagramuserguide.com/enneagram-test/tricenter-wing
travel_explore
web search NEUTRAL — About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How...
https://www.youtube.com/watch?v=i-QzUVwZ3Bg
info
“infrared brightness had also dipped”
SINGLE SOURCE
The evidence discusses the Andromeda galaxy and Betelgeuse, but does not provide specific data regarding the infrared brightness of HE 1237-2252.
travel_explore
web search NEUTRAL — During this epoch, its rate of star formation would have been very high, to the point of becoming a luminous infrared galaxy for roughly 100 million years. Modeling also recovers the bulge profile, th…
https://en.wikipedia.org/wiki/Andromeda_Galaxy
travel_explore
web search NEUTRAL — Active galaxies are galaxies that have a small core of emission embedded at the center of an otherwise typical galaxy.This illustration shows the different features of an active galactic nucleus (AGN)…
https://imagine.gsfc.nasa.gov/science/objects/active_galaxie…
travel_explore
web search NEUTRAL — But the Great Dimming, as it came to be known—when the star dimmed to about two-thirds of its normal brightness— was the faintest that the star had become in almost 200 years of observations. Research…
https://www.universetoday.com/articles/astronomers-caught-be…
info
“The X-ray flux recovered within just three months, but optical, UV, and infrared bands recovered more slowly, over roughly three years.”
SINGLE SOURCE
The evidence provides general definitions of infrared and UV radiation but does not mention the recovery timelines for HE 1237-2252.
travel_explore
web search NEUTRAL — Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves.
https://en.wikipedia.org/wiki/Infrared
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web search NEUTRAL — Solar Cycle Progression. Space Weather Advisory Outlook. 45-Day Ap and F10.7cm Flux Forecast.It's that time of year known as eclipse season for NOAA GOES satellites. The Earth will have more visual im…
https://www.swpc.noaa.gov/
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web search NEUTRAL — Harmful UV Combinations. Wildlife Behavior Map. Near Earth Asteroids.Subscribe to MrMBB333. Sun x-ray flux.
https://www.mrmbb333.com/
help
“By late 2024, the galaxy had returned to Type 1.0, with its spectral lines fully recovered.”
INSUFFICIENT EVIDENCE
No evidence was found after searching for this claim.
help
“the researchers also detected a distinct double-peaked pattern in the hydrogen emission lines”
INSUFFICIENT EVIDENCE
No evidence was found after searching for this claim.
schedule
“Alex Markowitz et al, A Changing-Look Seyfert Discovered by eROSITA Reveals a Two-Component Broad-Line Region, arXiv (2026). DOI: 10.48550/arxiv.2605.07965”
PENDING
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.