J-Net Galactic-Plane Survey of VLBI Radio Sources for VLBI Exploration of Radio Astrometry (VERA)

[摘要] InordertosearchfornewVLBIsourcesinthegalacticplanethatcanbeusedasphasereferencesourcesindifferentialVLBI,weconducted22GHzobservationsofradiosourcesinthegalacticplaneusingtheJapaneseVLBINetwork(J-Net).Wehaveobserved267VLBIsourcecandidatesselectedfromexistingradiosurveysandhavedetected93sourcesatasignal-to-noiseratiolargerthan5.While42ofthe93detectedsourceshadalreadybeendetectedwithVLBIatrelativelylowerfrequency(typically2to8GHz),theremaining51arefoundtobenewVLBIsourcesdetectedforthefirsttime.Thesearelocatedwithin|b|≤5°,andhavealargenumberofgalacticmasersourcesaroundthem.Thus,theyarepotentialcandidatesforphasereferencesourcesforVLBIExplorationofRadioAstrometry(VERA),whichisthefirstVLBIarraydedicatedtophase-referencingVLBIastrometryaimedatmeasuringtheparallaxandpropermotionofmasersourcesinthewholeGalaxy.

[学科分类] 天文学(综合)

[关键词] "galaxies: active";"quasars: general";"radio continuum: galaxies";"radio continuum: stars";vera