J/AJ/122/3155ivo://CDS.VizieR/J/AJ/122/3155doi:10.26093/cds/vizier.51223155CDSHiggs L.A.Kerton C.R.Knee L.B.G.2023-04-06T16:50:45Z2002-07-22T13:50:25ZCDS support team

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

cds-question@unistra.frmolecular-cloudsgalaxy-planesmilky-way-galaxyh-i-line-emissionradial-velocityAn H I cloud with a double-lobed structure and a radial velocity of +50km/s has been found near l=92{deg}, b=-4{deg} in a low-resolution H I survey carried out at the Dominion Radio Astrophysical Observatory (DRAO). This velocity is forbidden for circular Galactic rotation. Because of its unusual morphology and small variation in radial velocity over the cloud, further observations of the area were made with the DRAO Synthesis Telescope, both in the H I line and in the radio continuum. The cloud has dimensions of about 3.3{deg}x0.5{deg}, and has a morphology somewhat similar to high-velocity H I clouds (HVCs). Several possible associations with other objects are examined in this paper. A variable inverted-spectrum radio continuum source exists near the morphological center of the H I cloud. It is probably a rare example of a gigahertz peaked spectrum (GPS) extragalactic source having a peak above 5GHz. A luminous B star is found close to the peculiar H I cloud, and the cloud is also located near the center of an H I supershell, supposedly located at a distance of about 9kpc. Energetic and other considerations lead to the conclusion that the cloud is probably not related to the HVC phenomenon nor to any of the above objects but is a relic of a nearby (D~1kpc) supernova event, all other evidence of which has now dissipated. Maps of continuum radio emission (at 1420 and 408MHz) in the area around the cloud are presented, as well as lists of continuum radio sources. A few isolated high-velocity knots of H I emission have also been detected in the vicinity of the cloud.2001AJ....122.3155Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/122/3155CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/122/3155https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/122/3155http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/122/3155https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/122/3155https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/122/3155http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/122/3155GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/122/3155/table3 (Parameters of H I knots)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/3155/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/3155/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/3155/table3?GETtext/xml+votable180.050000true324.9604446.918920.005555555555555556Cone search capability for table J/AJ/122/3155/table4 (Point Sources Observed at 1420 MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/3155/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/3155/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/3155/table4?GETtext/xml+votable180.050000true321.42041746.9658330.005555555555555556Cone search capability for table J/AJ/122/3155/table5 (Point Sources Observed at 408 MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/122/3155/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/122/3155/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/122/3155/table5?GETtext/xml+votable180.050000true321.41958346.9652780.0055555555555555565/3512 3514 6/14013 14015 14027 14030 14052 14054https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/122/3155?format=asciiOpticalRadiodefaultJ/AJ/122/3155/table3Parameters of H I knotsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[HKK2001]Knot number ([HKK2001] Knot NN)meta.id;meta.mainintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRVLSR radial velocitykm/sphys.veloc;pos.lsrfloate_RVrms uncertainty on RVkm/sstat.errorfloatDVObserved widths (1)km/sspect.line.widthfloate_DVrms uncertainty on DVkm/sstat.errorfloatTbPeak brightnessKobs.paramfloattheta1Size of the knotarcminphys.angSize;srcfloattheta2Size of the knotarcminphys.angSize;srcfloatn_theta1Note on the sizemeta.notecharMassHI mass in D^2^ solMass (2)solMass.kpc**-2phys.densityfloatJ/AJ/122/3155/table4Point Sources Observed at 1420 MHze_RAsError in RAssstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqDesignation number (1)meta.idcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of the Declination (J2000)pos.eq.dec;meta.maine_DEsError in DEsarcsecstat.errorintFluxDenIntegrated flux density (1420MHz for table4, 408MHz for table5)mJyphot.flux.densityfloate_FluxDenError in FluxDenmJystat.errorfloatCommComments (2)meta.notecharJ/AJ/122/3155/table5Point Sources Observed at 408 MHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqDesignation number (1)meta.idcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.maine_RAsError in RAssstat.errorfloatDEJ2000Degree of the Declination (J2000)pos.eq.dec;meta.maine_DEsError in DEsarcsecstat.errorintFluxDenIntegrated flux density (1420MHz for table4, 408MHz for table5)mJyphot.flux.densityfloate_FluxDenError in FluxDenmJystat.errorfloatCommComments (2)meta.notechar