Conveners
Jets (Observation, theory and modelling)
- Alessio Marino (Insitute of Space Sciences (ICE-CSIC))
Jets (Observation, theory and modelling)
- Julien Malzac (IRAP (CNRS / Universite de Toulouse))
Jets (Observation, theory and modelling): Flash Talk
- Julien Malzac (IRAP (CNRS / Universite de Toulouse))
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Francesco Carotenuto (Istituto Nazionale di Astrofisica (INAF))17/09/2025, 09:00Invited talkInvited talk
Black hole X-ray binaries (BH XRBs) exhibit relativistic jets whose properties evolve with the accretion state. Compact jets, causally connected to the accretion flow, are observed during the hard state and are absent during the soft state, while discrete ejecta are launched during hard-to-soft state transitions. The physical mechanisms driving jet formation, quenching, and ejection remain...
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Julien Malzac (IRAP (CNRS / Universite de Toulouse))17/09/2025, 09:30Invited talkInvited talk
I will discuss models for the spectral and variability properties of jets.
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Sara Elisa Motta (Istituto Nazionale di Astrofisica (INAF))17/09/2025, 10:00Invited talkInvited talk
The inflow of matter onto astronomical objects is linked to the generation of outflows across the Universe, ranging from proto-planetary disks to merging neutron stars and gamma-ray bursts, to stellar-mass and supermassive black holes.
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Low-mass X-ray binaries, hosting either stellar-mass black holes or neutron stars, are common accreting systems in the Galaxy and exhibit bright jets detected... -
Prof. Nick Kylafis17/09/2025, 10:25TalkTalk
The outflow model is a very simple model, yet it explains quantitatively a number of very stringent correlations observed in black-hole X-ray binaries, some of which have not been explained by any other model. It is interesting that all these correlations are explained with only two parameters with values in two narrow ranges. What is more interesting is that the model makes three...
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Karri Koljonen (Norwegian University of Science and Technology)17/09/2025, 10:40TalkTalk
Transitional millisecond pulsars (tMSPs) offer a unique opportunity to study jet formation in a low-accretion regime around fast-spinning, magnetized neutron stars. We analyzed archival spectral energy distributions of confirmed and candidate tMSPs to investigate their jet properties. In this presentation, I will focus on the candidate tMSP 4FGL J0427.8−6704, for which ALMA data revealed a...
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Isabella Mariani (Istituto Nazionale di Astrofisica (INAF))17/09/2025, 11:25TalkTalk
Jets from black-hole X-ray binary systems (BH-XRBs) are powerful outflows that release a large fraction of the accretion energy to the surrounding environment, providing a feedback mechanism that alters the properties of the interstellar medium (ISM). Studying accretion processes alongside their feedback on the environment is crucial, as it enables to estimate the energy input/output around...
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Sergei Trushkin (Special Astrophysical Observatory)17/09/2025, 11:40TalkTalk
One of the most amazing microquasars is the Cyg X-3 binary system with a black hole and a massive Wolf-Rayet star. In 2024, during multi-frequency monitoring with the RATAN-600 radio telescope, we detected five giant (>10Jy) flares from Cyg X-3. The onsets of flares was clearly associated with the detection of significant Gamma-ray radiation at 0.1-300 GeV (Fermi space observatory). The...
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Fraser Cowie (University of Oxford)17/09/2025, 11:55TalkTalk
Circinus X-1 is a peculiar neutron star X-ray binary system (XRB) which defies conventional classification despite being studied for over 50 years. Surrounded by its natal supernova remnant aged at ~4600 years, Circinus X-1 is the youngest known XRB. However paradoxically, it displays many features common to older, low mass, low magnetic field neutron star XRBs. This provides a unique...
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Justine Crook-Mansour (University of OXford)17/09/2025, 12:10TalkTalk
The radio:X-ray plane is a valuable tool to better understand the connection between accretion and jet production in X-ray binaries during their hard spectral states. This correlation was originally believed to be universal and observed to span many orders of magnitude in X-ray flux. It was later extended to active galactic nuclei by including an additional mass term. However, doubt has since...
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Élodie Lescure (University of Lethbridge)17/09/2025, 12:25TalkTalk
Relativistic jets launched from accreting compact objects are thought to play an important role in our Universe, influencing large-scale processes such as galaxy evolution and star formation. However, the connection between their properties and those of the accretion flow remains poorly understood. Multi-wavelength time-domain observations of black hole X-ray binaries now offer a new avenue to...
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Eliot Pattie (Texas Tech University)17/09/2025, 12:40TalkTalk
Neutron star X-ray binary jets are observed to be less luminous than those of black holes, and are also less observed and thus less understood. Modern radio facilities are sensitive enough to investigate these neutron star jets in detail and begin to look at their properties as has been done for black hole jets. I will present an archival radio data project that compares rapid variability...
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Ms Carlotta Miceli (Istituto Nazionale di Astrofisica (INAF))17/09/2025, 12:55TalkTalk
The multi-wavelength spectral energy distributions of low-mass X-ray binaries (LMXBs) in the hard state are thought to be determined by the emission from a jet (up to mid-infrared frequencies) and the emission from the accretion flow from optical to X-ray up to (possibly) the soft gamma-ray domain. In recent years, the flat radio-to-mid-IR spectra of black hole (BH) X-ray binaries have been...
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Steve Prabu (Oxford University)17/09/2025, 13:10Flash-talkFlash-talk
Jets provide an important channel of kinetic feedback from accreting black holes into their environments. In the absence of instantaneous jet power measurements the extent of this feedback has proven difficult to quantify. Here we report the detection of stellar wind-induced bending of the jets in black hole X-ray binary Cygnus X-1, using 18 years of high-resolution radio imaging. By...
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Clara Lilje (University of Oxford)17/09/2025, 13:12Flash-talkFlash-talk
Jets from stellar mass black holes in X-ray binaries (XRBs) and supermassive black holes in blazars provide distinct opportunities to study the jets of black holes across two different mass regimes. They also represent samples with very different selection effects. Historically, the apparent speeds of XRB jets have been observed to be lower than those of blazars, leading to the assumption that...
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Pau Bosch-Cabot (University of Lethbridge)17/09/2025, 13:14Flash-talkFlash-talk
Black Hole X-ray binaries (BHXBs) serve as powerful laboratories for studying relativistic jets and their impact on the surrounding medium. MAXI J1348-630 is a BHXB that was recently discovered in outburst. This source was shown to exhibit strong radio jets with a distinct deceleration pattern of motion, indicative of the presence of a jet-blown cavity in the interstellar medium (ISM)....
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Emma Elley (University of Oxford)17/09/2025, 13:16Flash-talkFlash-talk
Previous observational and simulation work has explored the role the kink instability (KI) could play in explaining the phenomenology of active galactic nuclei jets and gamma ray bursts. Internal modes of this instability have been shown to drive conversion of magnetic energy into thermal energy without disrupting the overall flow of the jet. We suggest that these modes may therefore be able...
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Alex Cooper (University of Oxford)17/09/2025, 13:18Flash-talkFlash-talk
Black hole X-ray binaries in outburst launch discrete, large-scale jet ejections which can propagate to parsec scales. The kinematics of these ejecta appear to be well described by relativistic blast wave models originally devised for gamma-ray burst afterglows. In kinematic-only modelling a crucial degeneracy prevents the ejecta energy and interstellar medium density from being accurately...
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Zuobin Zhang (University of Oxford)17/09/2025, 13:20Flash-talkFlash-talk
Strong radio flare events were detected in black hole X-ray binary system 4U 1543-47 by MeerKAT. In this work, we investigated X-ray observation data during these periods. Our results suggest a four-step jet cycle: (1) the accretion disk is full, (2) the inner disk becomes unstable, (3) the jet is formed, (4) the disk refills.
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Qiana Hunt (University of Lethbridge)17/09/2025, 13:22Flash-talkFlash-talk
Recent endeavors to directly classify the donor star mass of extragalactic X-ray binaries (XRBs) through optical photometric modeling has uncovered an apparent overabundance of XRBs with donor stars with a mass between 3 and 8 solar masses. These so-called 'intermediate-mass XRBs' (IMXBs) make up as many as 30% of the XRBs in nearby spiral galaxies. A population of this size is in...
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Rob Fender (University of Oxford)TalkTalk
Despite a century of study, the long-sought connections between the physics of black holes and the processes underpinning the formation and launch of jets, their composition, energy content, and propagation remain elusive. Here we present the first statistically significant sample of accurately estimated transient jet speeds from accreting stellar mass black holes and neutron stars, the most...
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