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

Session

Multi-wavelength, Jets & Winds. Session 3.1: Accretion/Ejection

9 Sept 2026, 11:30

Cefalù

75. Accretion - ejection coupling in X-ray binaries

Rob Fender (University of Oxford)

09/09/2026, 11:30

Talk

I will review the current state of our understanding of accretion and ejection in black hole X-ray binaries. While I will keep the talk current and topical I will also reflect on how working with Tomaso Belloni brought a much fuller understanding of accretion to someone trained in radio astronomy, and how looking beyond one's silo is almost always worth it.

33. Modelling the kinematics of large-scale jets from black hole X-ray binaries

Francesco Carotenuto (Istituto Nazionale di Astrofisica (INAF))

09/09/2026, 12:00

Talk

Black hole X-ray binaries (BH XRBs) launch powerful outflows in the form of radio-emitting discrete jet ejecta, which are observed to be produced during outburst phases, at the transition between different accretion states. Once spatially resolved, these components are observed to propagate up to parsec scales far from the BH, often displaying apparent superluminal motion. However, little is...

62. Load and behold: simulating the launching and mass loading of discrete ejecta in X-ray binaries

Katherine Savard (University of Oxford)

09/09/2026, 12:15

Talk

Discrete ejecta from X-ray binaries are crucial for understanding jet physics from event horizon to parsec scales: launched during accretion state transitions, they probe the link between the accretion flow and jet launching, and then propagate up to $10^11$ gravitational radii, efficiently distributing mass and energy through their interaction with the ISM. Understanding how massive these...

57. The peculiar outburst of the black hole binary candidate 4U 1630-47: unveiling the radio polarimetry with MeerKAT

Isabella Mariani (Istituto Nazionale di Astrofisica (INAF))

09/09/2026, 12:30

Talk

X-ray binaries (XRBs) hosting a stellar-mass black hole (BH) or neutron star produce strong emission through accretion of matter from a companion star onto the compact object. This process can also lead to the formation of fast, collimated outflows, called jets. Most BH-XRBs are transient systems, producing steady compact jets during quiescence and hard X-ray states, and discrete ejecta...

110. Coupling accretion flow and jets in black hole X-ray binaries: insights from the multi-wavelength emission of Cygnus X-1

Julien Malzac (IRAP (CNRS / Universite de Toulouse))

09/09/2026, 12:45

Talk

We investigate the radio to MeV spectral energy distribution (SED) of the proto typical stellar-mass black hole, Cygnus X-1.

We model the SED by combining the jet Internal Shocks Emission Model (ISHEM) with the JED-SAD model (Jet Emitting Disk – Standard Accretion Disk) which links accretion and ejection.During the fitting procedure the jet kinetic power and average Lorentz factor of the...