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The many tones of accretion - to the memory of Tomaso Belloni

7–11 Sept 2026
Cefalù
UTC timezone

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Session

Beyond Stellar-Mass BHs & New Windows. Session 4.2: ULXs

10 Sept 2026, 11:45
Cefalù

Cefalù

Cefalù, province of Palermo, Sicily. Sala delle Capriate in the Town Hall (Piazza Duomo).

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  1. 38. The enchanted kingdom of ultra-luminous X-ray sources
    Dr Ciro Pinto (Istituto Nazionale di Astrofisica (INAF))
    10/09/2026, 11:45
    Talk

    Most stars in galaxies reside in binary systems, many of which are interacting and powered by matter transfer onto a compact object. The brightest and most extreme among these systems are ultraluminous X-ray sources (ULXs). Reaching luminosities well above $10^{41}$ erg/s, ULXs routinely breach the classical Eddington limit of stellar-mass objects, making them the "enchanted kingdom" of...

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  2. 10. A MeerKAT detected ULX radio bubble in NGC 1313
    Chiara Salvaggio (Istituto Nazionale di Astrofisica (INAF))
    10/09/2026, 12:15
    Talk

    Ultraluminous X-ray sources (ULXs) are a class of extreme X-ray binaries, most of them powered by super-Eddington accretion onto stellar mass black holes and neutron stars. Extended optical or radio emission (and a single case in X-rays) has been observed around some ULXs, with a bubble-like shape. These huge bubbles have diameters > 100 pc and contain an energy 10-100 times larger than the...

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  3. 8. What can we learn from the variability of M82 ULXs?
    Dr Matteo Bachetti (Istituto Nazionale di Astrofisica (INAF))
    10/09/2026, 12:30
    Poster

    The M82 galaxy harbors two of the most interesting ultraluminous X-ray sources (ULXs) -- off nuclear point sources radiating above the Eddington limit for a typical stellar remnant black hole.
    Some ULXs might be sub-Eddington intermediate-mass black holes, but the bulk of this class is now widely believed to be powered by super-Eddington accretion onto compact objects.
    In a handful of cases,...

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  4. 102. A Ring is not enough: Testing the origin of extreme ULX populations in Ring Galaxies
    Anna Wolter (Istituto Nazionale di Astrofisica (INAF))
    10/09/2026, 12:45
    Talk

    Ring galaxies (RiGs) represent a particularly favorable environment for the formation of Ultra Luminous X-ray sources (ULXs). These systems are produced by a cosmic crash between a disk galaxy and a smaller companion, generating an expanding density wave that compresses the interstellar medium and triggers intense star formation along a ring. The archetypal Cartwheel galaxy and several other...

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