Astronomers find 84 mysterious cosmic objects using Chandra

Researchers identified 84 hypersoft X-ray sources displaying extreme ultraviolet radiation across six external galaxies using publicly available observations from NASA’s Chandra X-ray Observatory. The investigation, documented in Nature Astronomy, revealed an unprecedented category of cosmic objects that emit low-energy radiation while vanishing in high-energy detectors. Lead author Mustafa Muhibullah of the University of Alabama confirmed that the scientific team had never recorded celestial bodies displaying this specific profile.

Chandra detected 84 sources.

Investigators located these unusual radiation sources across distinct galactic environments, including active star-forming clusters and zones dominated by older stars, within spiral galaxies M31 and M101 alongside four elliptical galactic structures that harbor widely diverse populations of binary stellar systems. A composite image of M101 revealed seven specific mystery specks scattered around a golden yellow core.

Galaxies housing the detected radiation sources

• M31, a spiral system also identified as the Andromeda galaxy
• M101, a spiral galaxy commonly known as the Pinwheel galaxy
• Four elliptical galaxies containing older stellar populations

Because low-energy X-rays border ultraviolet radiation on the electromagnetic spectrum, scientists determined that these entities generate substantial volumes of high-energy ultraviolet light. Dense clouds of hydrogen and helium gas between stars absorb this ultraviolet energy, creating a heavy physical barrier that previously obstructed astronomical detection. Co-author Rosanne Di Stefano of the Center for Astrophysics | Harvard & Smithsonian explained that analyzing archived observations helped eliminate telescope blind spots.

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Binary stellar interactions driving unusual emissions

Researchers believe each system likely features a white dwarf, neutron star, or black hole pulling material away from a companion star. This captured gas heats up during the transfer before dropping onto the compact remnant.

Binary pairs emitting low-energy X-rays alongside intense ultraviolet emissions had never appeared in earlier astronomical surveys. Mustafa Muhibullah stated: “These clandestine X-ray sources are actually among the most energetic objects in galaxies, and they could be solving two cosmic mysteries at once.” These systems may represent an extensive cosmic population that stayed completely hidden from traditional detectors. Scientists now seek to establish whether these pairs exist throughout other galactic neighborhoods.

Solutions to longstanding astrophysical questions

White dwarf systems pulling matter from companions can trigger Type Ia supernovae, which astronomers use to measure the ongoing expansion rate of the universe. Co-author Jimmy Irwin of the University of Alabama noted that finding progenitor stars before thermonuclear detonation occurs would solve longstanding questions regarding what material actually ignites.

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The second cosmic puzzle involves the stripping of electrons from interstellar gas between stars across entire galaxies. Massive, hot stars trigger part of this ionization process, yet their output fails to explain the complete stripping rate observed by astronomers. Intense ultraviolet radiation generated by hypersoft X-ray sources could provide the missing energy driving this widespread electron loss.

Management and operations of the orbital observatory

NASA’s Marshall Space Flight Center in Huntsville, Alabama, oversees the Chandra program.

The Smithsonian Astrophysical Observatory’s Chandra X-ray Center manages daily scientific operations from Cambridge, Massachusetts. Ground teams direct flight operations separately from Burlington, Massachusetts.

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