The Virgo stellar over-density Mapping the infall of the Sag(5)

TheoriginofremnantsinVirgo

uralHistory,AstrophysicalInstitutePotsdam,Univer-sityofBasel,CambridgeUniversity,CaseWesternRe-serveUniversity,UniversityofChicago,DrexelUniver-sity,Fermilab,theInstituteforAdvancedStudy,theJapanParticipationGroup,JohnsHopkinsUniversity,theJointInstituteforNuclearAstrophysics,theKavliInstituteforParticleAstrophysicsandCosmology,theKoreanScientistGroup,theChineseAcademyofSci-7

ences(LAMOST),LosAlamosNationalLaboratory,theMax-Planck-InstituteforAstronomy(MPIA),theMax-Planck-InstituteforAstrophysics(MPA),NewMexicoStateUniversity,OhioStateUniversity,UniversityofPittsburgh,UniversityofPortsmouth,PrincetonUni-versity,theUnitedStatesNavalObservatory,andtheUniversityofWashington.

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The recently discovered Virgo stellar over-density, which expands over \~1000deg^2 perpendicularly to the Galactic disk plane (7< Z <15 kpc, R~7 kpc), is the largest clump of tidal debris ever detected in the outer halo and is likely related with the accre

8Mart´ nez-Delgadoet

al.

Fig.1.—DensitymapsfromSDSSoftheNorthGalactichemisphere.Positionofourpositive(solidtriangles)andnegative

(opencircles)detectionoftheVirgostellarover-densitygiveninTable1,overplottedonaLambertprojectionofthedensity

mapofVirgogiveninJuri´cetal.(2005).ThismapwasgeneratedbyselectingMSstarswithb<0deg,0.2<g r<0.3and20<r<21.Concentriccirclescorrespondtoconstantgalacticlatitude(theNorthGalacticpoleisinthecenter;andtheoutermostcirclecorrespondtob=0deg.Thehighdensitypatchatl=45,b>30istheMilkyWaydiskprotrudingintothesurveyregion.

TABLE1

PositiveandnegativedetectionsofVirgofromcolour-magnitudediagrams

RA(J2000)12:24:00.0012:24:00.0010:20:00.0013:48:16.0015:37:49.0012:40:00.0013:56:21.0013:07:53.0010:49:22.0014:07:37.0016:11:05.0014:44:27.00Dec(J2000)-1:00:00.0-0:30:00.040:00:00.052:08:32.069:17:31.018:20:00.0-27:10:04.029:21:00.051:03:04.011:50:28.014:57:29.0-1:00:00.0l288.62288.39180.71103.69104.68285.67320.2865.42158.57356.1028.76351.54b61.1161.5956.2462.8141.4480.8233.5185.7556.7866.4842.1850.88DetectionPositivePositiveNegativeNegativeNegativeNegativeNegativeNegativeNegativeNegativeNegativeNegative

The recently discovered Virgo stellar over-density, which expands over \~1000deg^2 perpendicularly to the Galactic disk plane (7< Z <15 kpc, R~7 kpc), is the largest clump of tidal debris ever detected i …… 此处隐藏：5187字，全部文档内容请下载后查看。喜欢就下载吧 ……