J/AJ/149/42ivo://CDS.VizieR/J/AJ/149/42doi:10.26093/cds/vizier.51490042CDSPryor C.Piatek S.Olszewski E.W.2017-06-29T08:56:10Z2015-04-23T14:40:36ZCDS support team

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

cds-question@unistra.frgalaxiesproper-motionsWe have measured the proper motion of the Draco dwarf galaxy using images at two epochs with a time baseline of about two years taken with the Hubble Space Telescope Advanced Camera for Surveys. Wide Field Channels 1 and 2 provide two adjacent fields, each containing a known QSO. The zero point for the proper motion is determined using both background galaxies and the QSOs and the two methods produce consistent measurements within each field. Averaging the results from the two fields gives a proper motion in the equatorial coordinate system of ({mu}_{alpha}_,{mu}_{delta}_)=(-17.7+/-6.3,-22.1+/-6.3)mas/century and in the Galactic coordinate system of ({mu}_l_,{mu}_b_)=(-23.1+/-6.3,-16.3+/-6.3)mas/century. Removing the contributions of the motion of the Sun and of the LSR to the measured proper motion yields a Galactic rest-frame proper motion of ({mu}_{alpha}_^Grf^,({mu}_{delta}_^Grf^)=(51.4+/-6.3,-18.7+/-6.3)mas/century and ({mu}_l_^Grf^,({mu}_b_^Grf^)=(-21.8+/-6.3,-50.1+/-6.3)mas/century. The implied space velocity with respect to the Galactic center is ({Pi},{Theta},Z)=27+/-14,89+/-25,-212+/-20)km/s. This velocity implies that the orbital inclination is 70{deg}, with a 95% confidence interval of (59{deg},80{deg}), and that the plane of the orbit is consistent with that of the vast polar structure (VPOS) of Galactic satellite galaxies.2015AJ....149...42Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/435/1928 : Dwarf galaxy planes in Local Group (Pawlowski+, 2013)J/AJ/136/1921 : Variable stars of Draco dSph (Kinemuchi+, 2008)J/A+A/465/357 : Stroemgren photometry in Draco dSph galaxy (Faria+, 2007)J/A+A/442/165 : Photometry of late-type stars in Draco dSph (Cioni+, 2005)J/AJ/127/861 : RR Lyrae in Draco dSph (Bonanos+, 2004)J/ApJS/145/245 : SDSS stars in Draco dwarf spheroidal galaxy (Rave+, 2003)J/MNRAS/330/792 : Radial velocity in Draco (Kleyna+, 2002)J/AJ/124/3222 : VI photometry of Draco and UMi galaxies (Bellazzini+, 2002)J/AJ/123/2511 : Photometry of Draco dwarf spheroidal galaxy (Piatek+, 2002)J/AJ/121/841 : RV photometry of Draco dwarf galaxy (Piatek+, 2001)J/AJ/110/2131 : M/L for Draco and UMi. I. (Armandroff+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/42https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/42/table2 (Information about pointings and images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/42/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/42/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/42/table2?GETtext/xml+votable180.050000true259.89333357.98050.005555555555555556Cone search capability for table J/AJ/149/42/stars (Positions and proper motions in WFC1 field , and in WFC2 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/42/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/42/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/42/stars?GETtext/xml+votable180.050000true260.217958357.92038890.0055555555555555566/10183https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/42?format=asciiOpticaldefaultJ/AJ/149/42/table2Information about pointings and imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the pointingmeta.numbercharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainDate1Date of the observation for the first epoch (2)time.epochnullableDet1Detector for the first epoch (3)meta.id;meta.maincharFlt1Filter for the first epoch (F555W or F606W)meta.code;instr.filtercharN1[19] Number of exposures for the first epochmeta.numberintExp1[430] Exposure time for the first epochstime.duration;obs.exposureintDate2Date of the observation for the second epoch (2)time.epochnullableDet2Detector for the second epoch (3)meta.idcharFlt2Filter for the second epoch (F555W or F606W)meta.code;instr.filtercharN2[12/19] Number of exposures for the second epochmeta.numberintExp2[427/600] Exposure time for the second epochstime.duration;obs.exposureintJ/AJ/149/42/starsPositions and proper motions in WFC1 field , and in WFC2 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWFCWide Field Channel (1 or 2)meta.id;instrcharSeq[1/2292] Running sequence numbermeta.id;meta.mainintType[0/2] Object type (0=QSO, 1=star, 2=galaxy)src.classintXpix[61.18/4084.9] The X pixel coordinate (1)pixpos.cartesian.xfloatYpix[-108.37/4218.09] The Y pixel coordinate (1)pixpos.cartesian.yfloatoRA[-181/85] Right Ascension offset (2)arcsecpos.eq.ra;arith.diffdoubleoDE[-173/112] Declination offset (2)arcsecpos.eq.dec;arith.diffdouble<S/N>[10/529] Average Signal-to-Noise at first epochstat.snrintpmRA[-953/1989] Measured proper motion along Right Ascension (in mas/century)10uarcsec/yrpos.pm;pos.eq.rafloate_pmRA[17/230] Uncertainty in pmRA (3)10uarcsec/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-1475/1012] Measured proper motion along Declination (in mas/century)10uarcsec/yrpos.pm;pos.eq.decfloate_pmDE[17/270] Uncertainty in pmDE (3)10uarcsec/yrstat.error;pos.pm;pos.eq.decfloatMm[0/1] Member code (1=likely Draco member) (4)meta.code.memberint_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main