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Using pulsars as ultra-precise gravitational probes to 'weigh' neighboring galaxies

Phys · · 890 words · By Russ Nelson

Researchers from the University of Alabama in Huntsville and the University of Surrey have developed a method to measure the mass of satellite galaxies orbiting the Milky Way using pulsar timing data. The study suggests that measuring gravitational acceleration via pulsars is more accurate than traditional stellar kinematics for estimating the mass of dwarf galaxies and studying dark matter.

open_in_new Read the original article: https://phys.org/news/2026-05-pulsars-ultra-precise-gravitational-probes.html

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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.

verified Verified 6
help Insufficient Evidence 2
verified Verified By Reference 1
check_circle Corroborated 1
schedule Pending 1
verified
“Researchers at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, have identified a promising new method for measuring the mass of galaxies orbiting the Milky Way by using pulsars”
VERIFIED
The official UAH news site explicitly states that UAH researchers found a new method to 'weigh' neighboring galaxies using pulsars.
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web search NEUTRAL — Artist’s impression of the structure of the Milky Way based on data from the European Space Agency’s Gaia telescope, including the location of the spiral arms, bar, and bulge.
https://en.wikipedia.org/wiki/Milky_Way
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web search NEUTRAL — UAH researchers find new method to “weigh” neighboring galaxies using pulsars as ultra-precise gravitational probes.The pulsar-based method offers a cleaner and more direct way to measure gravitationa…
https://www.uah.edu/news/items/uah-researchers-find-new-meth…
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web search NEUTRAL — Lopez was studying for her Masters degree at the University of Central Lancashire in the UK when her supervisor suggested using a new method to analyse large scale structures in the Universe.
https://www.bbc.com/future/article/20230302-the-giant-arcs-t…
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“The work, published on the arXiv preprint server, offers a novel approach for studying the hidden dark matter contained within nearby satellite galaxies.”
VERIFIED
The arXiv preprint title 'Weighing the Milky Way's Satellite Galaxies Using Pulsar Accelerations' confirms the novel approach to studying satellite galaxies (which contain dark matter).
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web search NEUTRAL — Instead of learning individual facts, study around themes or concepts. This will help you gain a broader understanding of the subject, making it easier to answer open-ended questions.
https://www.uantwerpen.be/en/life-in-antwerp/wellbeing/study…
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web search NEUTRAL — 6 days ago · The Study Circle was founded as a British society in 1951 but its membership has expanded and is now international with particular strength from membership in Belgium, USA and the U.K.
http://www.belgian-congo-study-circle.be/
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web search NEUTRAL — Mar 28, 2018 · Explore study programs and courses offered at Ghent University with detailed guides to help you make informed academic choices.
https://studiekiezer.ugent.be/en/zoek
verified
“The study was authored by UAH astrophysicists Dr. Thomas Donlon, postdoctoral research assistant II, and Dr. Sukanya Chakrabarti, a professor and Pei-Ling Chan Endowed Chair in the College of Science, in collaboration with Dr. Jason A. S. Hunt, an astrophysicist at the University of Surrey, U.K.”
VERIFIED
The arXiv paper explicitly lists Thomas Donlon II, Sukanya Chakrabarti, and Jason A. S. Hunt as authors.
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web search NEUTRAL — Authors:Thomas Donlon II, Sukanya Chakrabarti, Jason A. S. Hunt. View a PDF of the paper titled Weighing the Milky Way's Satellite Galaxies Using Pulsar Accelerations, by Thomas Donlon II and 2 other …
https://arxiv.org/abs/2512.10883
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web search NEUTRAL — 2021 )andtheSagittariusdwarfspheroidalgalaxy(Sgr. Corresponding author: Thomas Donlon II.MW’s satellites. The pulsar accelerations span a rela-. tively small region of the disk (only a few kpc out fro…
https://www.researchgate.net/publication/398601795_Weighing_…
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web search NEUTRAL — *Contact author: thomas.donlon@uah.edu.The properties of dwarf galaxies orbiting the Milky Way (MW) are useful for testing models of the formation of our Galaxy, and by extension various theories of c…
https://journals.aps.org/prd/abstract/10.1103/zz5s-zwh8
verified
“Pulsars are rapidly rotating remnants of collapsed stars that emit beams of radiation at extraordinarily regular intervals.”
VERIFIED BY REFERENCE
Wikipedia and other astronomical sources define pulsars as rotating neutron stars (collapsed stars) that emit radiation at regular intervals.
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web search NEUTRAL — Rotation-powered pulsar (RPP or "radio pulsar"):[69] neutron stars that emit directed pulses of radiation towards us at regular intervals (due to their strong magnetic fields).
https://en.wikipedia.org/wiki/Neutron_star
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web search NEUTRAL — Pulsars are rapidly rotating neutron stars that blast out pulses of radiation at regular intervals ranging from seconds to milliseconds.
https://www.space.com/32661-pulsars.html
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web search NEUTRAL — Pulsars are highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation, which can be detected as pulses when the beam is directed toward Earth.
https://www.ebsco.com/research-starters/astronomy-and-astrop…
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“The research team used this principle to investigate the influence of two of the Milky Way's satellite galaxies: the Large Magellanic Cloud and the Sagittarius Dwarf Spheroidal Galaxy.”
VERIFIED
The PDF snippet of the research paper explicitly mentions the Large Magellanic Cloud and the Sagittarius dwarf spheroidal galaxy (Sgr) as the targets of the study.
travel_explore
web search NEUTRAL — Instead of learning individual facts, study around themes or concepts. This will help you gain a broader understanding of the subject, making it easier to answer open-ended questions.
https://www.uantwerpen.be/en/life-in-antwerp/wellbeing/study…
travel_explore
web search NEUTRAL — 6 days ago · The Study Circle was founded as a British society in 1951 but its membership has expanded and is now international with particular strength from membership in Belgium, USA and the U.K.
http://www.belgian-congo-study-circle.be/
travel_explore
web search NEUTRAL — Mar 28, 2018 · Explore study programs and courses offered at Ghent University with detailed guides to help you make informed academic choices.
https://studiekiezer.ugent.be/en/zoek
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“we made the first measurements with pulsar timing in 2021”
CORROBORATED
Both the UAH news site and Newswise report the researcher's quote stating they made the first measurements with pulsar timing in 2021.
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web search NEUTRAL — “In 2020, I started working on direct acceleration measurements, and we made the first measurements with pulsar timing in 2021,” the researcher adds.
https://www.newswise.com/articles/uah-researchers-find-new-m…
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web search NEUTRAL — Abstract We investigate pulsar timing residuals due to the coupling effect of the pulsar transverse acceleration and the R¨omer delay. The effect is relatively small and usually negligible. Only for p…
https://www.raa-journal.org/issues/all/2021/v21n11/202203/t2…
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web search NEUTRAL — A binary pulsar is a pulsar with a companion that allows physicists to test general relativity because of the strong gravitational fields accompanying these objects. "Pulsars are fantastic galactic cl…
https://phys.org/news/2024-02-pulsar-probe-dark-milky-galaxy…
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“At that time, we could only constrain the smooth component of the gravitational potential with 14 pairs of millisecond pulsars.”
VERIFIED
The UAH news site directly quotes the researcher stating that at that time they could only constrain the smooth component of the gravitational potential with 14 pairs of millisecond pulsars.
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web search NEUTRAL — A millisecond pulsar (MSP) is a pulsar with a rotational period less than about 10 milliseconds. Millisecond pulsars have been detected in radio, X-ray, and gamma ray portions of the electromagnetic s…
https://en.wikipedia.org/wiki/Millisecond_pulsar
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web search NEUTRAL — UAH researchers find new method to “weigh” neighboring galaxies using pulsars as ultra-precise gravitational probes.“At that time, we could only constrain the smooth component of the gravitational pot…
https://www.uah.edu/news/items/uah-researchers-find-new-meth…
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web search NEUTRAL — In this talk I will describe how pulsars were accidentally discovered, and reflect on several instances where they were 'nearly' discovered.
https://www.youtube.com/watch?v=ot1Ggv6YZyQ
verified
“Tom expanded the usable sample to 26 pulsars and later to 54.”
VERIFIED
The UAH news site explicitly mentions that Tom expanded the usable sample to 26 pulsars and later to 54.
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web search NEUTRAL — Pulsars’ highly regular pulses make them very useful tools for astronomers. For example, observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravi…
https://en.wikipedia.org/wiki/Pulsar
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web search NEUTRAL — When he joined my research group, Tom expanded the usable sample to 26 pulsars and later to 54. With this larger set, we now have sensitivity to the impact of dwarf galaxies to the extent that we can …
https://www.uah.edu/news/items/uah-researchers-find-new-meth…
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web search NEUTRAL — Thomas Donlon's 11 research works with 223 citations, including: Empirical modeling of magnetic braking in millisecond pulsars to measure the local dark matter density and effects of orbiting satellit…
https://www.researchgate.net/scientific-contributions/Thomas…
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“the researchers estimated that the Large Magellanic Cloud has a mass of approximately 41 billion times that of the sun”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to confirm the specific mass estimate of 41 billion solar masses for the LMC.
help
“the Sagittarius dwarf galaxy has a mass of roughly 350 million solar masses.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to confirm the specific mass estimate of 350 million solar masses for the Sagittarius dwarf galaxy.
schedule
“Thomas Donlon et al, Weighing the Milky Way's Satellite Galaxies Using Pulsar Accelerations, arXiv (2025). DOI: 10.48550/arxiv.2512.10883”
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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.