J/A+A/706/A283ivo://CDS.VizieR/J/A+A/706/A283CDSGrollimund N.Corbel S.Fender R.Matthews J.H.Heywood I.,Cowie F.J.Hughes A.K.Carotenuto F.Motta S.E.Woudt P.2026-05-20T13:40:33Z2026-02-17T11:23:20ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frx-ray-binary-starsradio-continuum-emissionblack-holesBlack holes (BHs) in microquasars can launch powerful relativistic jets that have the capacity to travel up to several parsecs from the compact object and interact with the interstellar medium. Recently, the detection of large-scale very-high-energy (VHE) gamma-ray emission around the 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. The goal of this work is to search for a radio counterpart of the extended VHE source. We observed V4641 Sgr with the MeerKAT radio telescope at the L and UHF bands and produced deep maps of the field using high dynamic range techniques. We report the discovery of a large-scale (35pc), bow-tie-shaped, diffuse, radio structure around V4641 Sgr, with similar angular size to the extended X-ray emission discovered by XRISM. However, it is not spatially coincident with the extended VHE emission. After discussing the association of the structure with V4641 Sgr, we investigate the nature of the emission mechanism. We suggest that the bow-tie structure arose from the long-term action of large-scale jets or disk winds from V4641 Sgr. If the emission mechanism is of synchrotron origin, the radio/X-ray extended structure implies acceleration of electrons up to more than 100TeV as far as tens of parsecs from the black hole.2026A&A...706A.283Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/706/A283CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/706/A283https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/706/A283http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/706/A283https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/706/A283https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/706/A283http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/706/A283GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/706/A283/obs (SARAO MeerKAT L-band intensity map properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/706/A283/obs?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/706/A283/obs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/706/A283/obs?GETtext/xml+votable180.050000true274.8402941307437-25.403152777681040.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/706/A2836/28798https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/706/A283?format=asciiX-rayRadiodefaultJ/A+A/706/A283/obsSARAO MeerKAT L-band intensity map propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (target_name)meta.id;meta.maincharRA_ICRSRight ascension (ICRS) at Ep=2000 (s_ra)degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2000 (s_dec)degpos.eq.dec;meta.mainFOVField of view (s_fov)degphys.angSize;instr.fovdoubleRegionPixel region (s_region) (1)meta.notecharResAngular pixel resolution (s_region)arcsecpos.angResolution;instr.pixelfloattminMinimum time (t_min)stime.epochdoubletmaxMaximum time (t_max)stime.epochdoubleExpExposure time (t_exptime)stime.duration;obs.exposureinttResTime resolution (t_resolution)arcsectime.resolutionintIminMinimum intensity at 856 MHz (em_min)Jy/beamphot.flux.density;em.radio.750-1500MHzdoubleImaxMaximum intensity at 1578 MHz (em_max)Jy/beamphot.flux.density;em.radio.1500-3000MHzdoubleSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/706/A283/listDescription of fits imagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar