J/A+A/673/A60ivo://CDS.VizieR/J/A+A/673/A60doi:10.26093/cds/vizier.36730060CDSBayandina O.S.Burns R.A.Kurtz S.E.Moscadelli L.Sobolev A.M.,Stecklum B.Val'tts I.E.2024-11-28T20:03:26Z2023-05-05T07:38:43ZCDS support team

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

cds-question@unistra.frstar-forming-regionsastrophysical-masersradio-astronomyradio-sourcesG25.65+1.04 is one of a few known "super-flare" water masers in the Milky Way, but in contrast to the other sources of the sample, it remains the least studied; in fact, even the nature of the source driving the water maser is still unclear. With this project, we aim to clarify the composition and properties of the G25.65+1.04 region by means of examining the parameters of the continuum sources and establishing their association with masers of different types. Our previous VLA observation detected four continuum peaks (VLA 1-4), three of which (VLA 1-3) were closely spaced and presented a linear orientation. However, that VLA B-configuration observation lacked the spatial resolution to resolve the individual sources. A higher resolution (A-configuration) VLA observation of continuum and spectral lines was conducted in 2019 using L, S, C, and Ku-bands. For the first time, the continuum source VLA 1 - associated with the flaring water maser - is resolved into two components - VLA 1A and 1B. VLA 1A and the water maser are found to spatially coincide and are thought to be powered by the same source - a protostar at an early stage of evolution, showing active ejection. We argue that VLA 2 pinpoints an activly ejecting high-mass protostar as it is associated with a 6.7GHz methanol maser and a magnetised jet traced by 22GHz H_2_O maser. Highly polarised OH maser emission is detected in the vicinity of VLA 1-2, with the brightest OH maser found in VLA 2. The magnetic field, identified from the OH maser emission, ranges from ~+0.4mG in VLA 1A to ~-8mG in VLA 2. The G25.65+1.04 region is found to consist of at least two young stellar objects: VLA 1A and VLA 2. Both sources are found to be at an active accretion/ejection stage of evolution.2023A&A...673A..60Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/673/A60CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/884/140 : VLA obs. of the H2O maser source G25.65+1.05https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/673/A60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/673/A60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/673/A60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/673/A60https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/673/A60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/673/A60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/673/A60/table4 (6.7GHz CH_3_OH maser parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/673/A60/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/673/A60/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/673/A60/table4?GETtext/xml+votable180.050000true278.587116667-5.9951333330.005555555555555556Cone search capability for table J/A+A/673/A60/table5 (1665 and 1667MHz OH maser parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/673/A60/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/673/A60/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/673/A60/table5?GETtext/xml+votable180.050000true278.587146389-5.9951547220.0055555555555555566/302414.439466485724119e-24 4.439466485724119e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/673/A60?format=asciiRadiodefaultJ/A+A/673/A60/table46.7GHz CH_3_OH maser parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupGroup name (S, NE or NW)meta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.maine_RAJ2000Uncertainty in right ascensionsstat.error;pos.eq.rafloatDEJ2000Declination (J2000)pos.eq.dec;meta.maine_DEJ2000Uncertainty in declinationarcsecstat.error;pos.eq.decfloatFintIntegrated flux at 6.7GHzJyphot.flux.density;em.radio.6-12GHzfloate_FintUncertainty in FintJystat.errorfloatFpeakPeak flux at 6.7GHzJy/beamphot.flux.density;em.radio.6-12GHzfloate_FpeakUncertainty in FpeakJy/beamstat.errorfloatVelVelocitykm/sspect.dopplerVelocfloatJ/A+A/673/A60/table51665 and 1667MHz OH maser parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[1665/1667] OH transition frequencyMHzem.freq;phys.atmol.transitionintPol[RL] Polarisationmeta.codecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.maine_RAJ2000Uncertainty in right ascensionsstat.error;pos.eq.rafloatDEJ2000Declination (J2000)pos.eq.dec;meta.maine_DEJ2000Uncertainty in declinationarcsecstat.error;pos.eq.decfloatFintIntegrated flux at FreqJyphot.flux.density;em.radio.1500-3000MHzfloate_FintUncertainty in FintJystat.errorfloatFpeakPeak flux at FreqJy/beamphot.flux.density;em.radio.1500-3000MHzfloate_FpeakUncertainty in FpeakJy/beamstat.errorfloatVelVelocitykm/sspect.dopplerVelocfloat