Ultraluminous X-ray sources (ULXs) as a research area focus on extragalactic, non-nuclear X-ray emitters with luminosities exceeding the Eddington limit of typical stellar-mass black holes, often in the range 10³⁹–10⁴¹ erg s⁻¹. This field investigates their nature as candidates for super-Eddington accretion onto stellar-mass compact objects or accretion onto intermediate-mass black holes. Research emphasizes multiwavelength observations, spectral and timing analyses, accretion physics in extreme regimes, the role of beaming and outflows, and their connection to star formation, X-ray binaries, and black hole growth across different galactic environments.
An international team led by Stefanie Komossa from the Max Planck Institute for Radio Astronomy (MPIfR) in Bonn has studied a galaxy that has been shining exceptionally brightly in the radio regime for more than eight years. ...
Astronomy
Jul 5, 2026
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Astronomers from Germany and Turkey have analyzed available data from various space telescopes to investigate an ultraluminous X-ray source designated X-4, which is located in the nearby galaxy NGC 4631. Results of the new ...
Indian astronomers have investigated an ultraluminous X-ray pulsar in the galaxy NGC 4631, designated X-8. The new study, described in a paper published Feb. 16 on the arXiv preprint server, provides essential information ...
A research team has investigated long-term X-ray variability in the neutron star NGC 7793 P13, an object thought to be driven by supercritical accretion, where an extraordinary amount of gas falls onto the object and emits ...
Astronomy
Dec 14, 2025
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Using ESA's XMM-Newton satellite, European astronomers have observed ultraluminous X-ray sources (ULXs) in the galaxy NGC 4631. As a result, they detected a new pulsating ULX, which received the designation X-8. The research ...
Using NASA's Chandra and ESA's XMM-Newton space observatories, Indian astronomers have explored the population of ultraluminous X-ray sources in the galaxy NGC 5813, which resulted in the detection of a new source of this ...
In the vast cosmos, fast radio bursts (FRBs) remain one of the most mysterious astrophysical phenomena ever discovered. These intense, millisecond-duration radio pulses can release in the radio band alone as much energy as ...
Astronomy
Jun 17, 2025
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Gas swirls around a black hole due to its intense gravity, forming an accretion disk. These accretion disks, being among the most efficient energy conversion mechanisms in the universe, emit light and plasma jets. When a ...
Astronomy
Oct 2, 2024
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