J/A+A/677/A97ivo://CDS.VizieR/J/A+A/677/A97doi:10.26093/cds/vizier.36770097CDSFeeney-Johansson A.Purser S.J.D.Ray T.P.Carrasco-Gonzalez C.,Rodriguez-Kamenetzky A.Eisloeffel J.Lim J.Galvan-Madrid R.,Lizano S.Rodriguez L.F.Shang H.Ho P.Hoare M.2025-05-22T20:01:22Z2023-09-11T08:10:42ZCDS support team

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

cds-question@unistra.frprotostarsradio-continuum-emissionUsing observations with e-MERLIN and the VLA, together with archival data from ALMA, we obtain high-resolution radio images of two binary YSOs: L1551 IRS 5 and L1551 NE, covering a wide range of frequencies from 5-336GHz, and resolving emission from the radio jet on scales of only ~15au. By comparing these observations to those from a previous epoch, it is shown that there is a high degree of variability in the free-free emission from the jets of these sources. In particular, the northern component of L1551 IRS 5 shows a remarkable decline in flux density of a factor of ~5, suggesting that the free-free emission of this source has almost disappeared. By fitting the spectra of the sources, the ionised mass-loss rates of the jets are derived and it is shown that there is significant variability of up to a factor of ~6 on timescales of ~20 years. Using radiative transfer modelling, we also obtained a model image for the jet of the southern component of L1551 IRS 5 to help study the inner region of the ionised high-density jet. The findings favour the X-wind model launched from a very small innermost region.2023A&A...677A..97Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/677/A97CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/318/879 : IR photometry of L1551/IRS5 (Men'shchikov+ 1997)J/A+A/420/945 : L1551 ISOCAM observations (Galfalk+, 2004)J/AJ/132/1851 : Arecibo obs. of formaldehyde in L1551 (Araya+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/677/A97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/677/A97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/677/A97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/677/A97https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/677/A97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/677/A97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/677/A97/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/677/A97/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/677/A97/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/677/A97/list?GETtext/xml+votable180.050000true67.891918.134610.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/677/A976/23549https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/677/A97?format=asciiRadiodefaultJ/A+A/677/A97/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreqObaserved frequencyHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitschar