Speaker
Description
Black holes in microquasars can launch powerful relativistic jets, that can travel up to several parsecs from the compact object and interact with the interstellar medium. Recently, the detection of large-scale ultra-high-energy gamma-ray emission around black hole transient V4641 Sgr and other BH-jet systems suggested that jets from microquasars may play an important role in the production of galactic cosmic rays. V4641 Sgr is known for its superluminal radio jet discovered in 1999, but no radio counterpart of a large-scale jet has been observed yet. Here, we report on the discovery of a large-scale (∼ 35 pc), ’bow-tie’ shaped, diffuse, radio structure around V4641 Sgr, detected in deep radio observations conducted with MeerKAT. After discussing the association of the structure with V4641 Sgr, we show that a combined leptonic (radio and X-rays) and hadronic (gamma-rays) can explain the observed broad-band SED. We suggest that the ’bow-tie’ structure arose from the long-term action of large-scale jets from V4641 Sgr. If the emission mechanism is of synchrotron origin, the radio/X-ray extended structure implies acceleration of electrons up to ∼ 130 TeV as far as tens of parsecs from the black hole.
| Contribution | Oral talk |
|---|---|
| Affiliation | CEA Saclay / Université Paris Cité |
| noa.grollimund@cea.fr |
