J/AJ/150/77ivo://CDS.VizieR/J/AJ/150/77doi:10.26093/cds/vizier.51500077CDSVickers J.J.Smith M.C.Grebel E.K.2017-06-28T12:52:08Z2015-11-02T13:15:59ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyf-starsproper-motionsmetallicityIn this paper we analyze a sample of metal-rich (>-0.8dex) main sequence stars in the extended solar neighborhood, investigating kinematic outliers from the background population. The data, which are taken from the Sloan Digital Sky Survey, are kinematically profiled as a function of distance from the Galactic plane using full six-dimensional phase space information. Each star is examined in the context of these kinematic profiles and likelihoods are assigned to quantify whether a star matches the underlying profile. Since some of these stars are likely to have been ejected from the disk, we trace back their orbits in order to determine potential ejection radii. We find that objects with low probability (i.e., "outliers") are typically more metal-poor, faster and, most importantly, have a tendency to originate from the inner Galaxy compared to the underlying population. We also compose a sample of stars with velocities exceeding the local escape velocity. Although we do not discount that our sample could be contaminated by objects with spurious proper motions, a number of stars appear to have been ejected from the disk with exceptionally high velocities. Some of these are consistent with being ejected from the spiral arms and hence are a rich resource for further study. Finally we look at objects whose orbits are consistent with them being ejected at high speeds from the Galactic center. Of these objects we find that one, J135855.65+552538.19, is inconsistent with halo, bulge and disk kinematics and could plausibly have been ejected from the Galactic nucleus via a Hills mechanism.2015AJ....150...77Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/77CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)I/317 : The PPMXL Catalog (Roeser+ 2010)J/ApJ/751/55 : MMT hypervelocity star survey. II. (Brown+, 2012)J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)J/ApJ/660/311 : Hypervelocity stars. II. (Brown+, 2007)J/ApJ/647/303 : Spectroscopic survey of hypervelocity stars (Brown+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/77https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/77/table2 (Hypervelocity candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/77/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/77/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/77/table2?GETtext/xml+votable180.050000true125.066166736.37312780.0055555555555555566/51 733 908 910 926 968 971 975 990 1012 1679 1690 1699 1701 1702 1708 2029 2041 2086 2180 2296 2298 2299 2644 2848 2851 2852 4105 4107 4139 4165 4186 4225 4255 4291 4386 4506 4507 4533 4541 4627 4638 4684 4689 4701 4747 4749 4750 4758 4762 4764 4768 4769 4771 4772 4774 4783 4794 4918 4967 5033 5134 5178 5182 5423 5592 5688 5690 5737 5755 5794 5800 5813 5831 6151 6215 6217 6220 6222 6223 6240 6286 6299 6307 6308 6310 6311 6312 6313 6320 6340 6350 6372 6387 6392 6394 6399 6405 6407 6427 6428 6528 6531 6569 6579 6586 6608 6686 6704 6706 6725 6727 6732 6740 7165 7239 7507 7782 8125 8126 8349 9328 9375 9492 9794 9795 10234 10285 10719 10823 10841 11444 11449 11883 12379 12402 12525 12527 12824 12825 12864 12865 12866 13563 13639 13681 13690 13777 13805 13808 13810 14021 14032 14034 14584 14585 15892 15893 16159 17242 17663 17767 17770 17773 18006 18013 18018 18028 18170 18389 18786 19022 19030 19031 19047 19053 19086 19087 19099 19100 19109 19118 19268 19271 19597 19739 19750 19753 19759 19930 20254 20328 20347 20436 20454 21768 21770 21779 21789 21859 21867 21869 21909 21910 22361 22384 22457 22458 22459 22460 22462 22515 22516 22740 22824 22826 22896 22912 22948 23058 23190 24047 24053 24055 24058 24060 24061 24063 24249 24390 24400 25517 25528 25942 26203 26262 26979 27023 27039 27044 27045 27238 27239 27244 27452 27626 27952 28191 28383 30033 30034 31616 31883 31886 31904 31908 32099 32155 32158 32159 32182 32202 32440 32530 32538 32559 32691 32697 48881 48885 49085 49086https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/77?format=asciidefaultJ/AJ/150/77/table2Hypervelocity candidatesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNt[0/4] Number of tests in which the hypervelocity star candidate failed (0=candidate that pass our strict proper motion quality cut) (1)meta.numberintNameIAU identifier (JHHMMSS.ss+DDMMSS.ss) (2)meta.id;meta.maincharf_Name[*] Indicates an object independently noted by Palladino et al. (2014ApJ...780....7P)meta.code;meta.id;meta.maincharDpm[0.7/1412.37] Change in the proper motion (3)mas/yrarith.rate;pos.pm;arith.difffloatSep[1.16/28.7] Nearest neighbor separation (4)arcsecpos.angDistancefloatpmTot[4.93/707.65] Total proper motion (5)mas/yrpos.pmfloate_pmTot[3.2/15.5] The 1{sigma} SDSS error in pmTot (6)mas/yrstat.error;pos.pmfloat[Fe/H][-0.8/0.41] Metallicity (7)phys.abund.ZfloatVtotal[548.19/10628.51] Total velocitykm/sphys.velocdoublee_Vtotal[40.11/839.2] Uncertainty in Vtotalkm/sstat.error;phys.velocfloatVesc[463.76/603.49] Escape velocitykm/sphys.veloc.escapefloatInfall[X] Infalling candidate indicator (X=yes)meta.codecharPPMXLDisplay the data from the PPMXL catalog (Roeser et al. 2010, cat. I/317)meta.ref.urlcharSDSSDisplay the data from the SDSS-DR9 catalog (cat. V/139)meta.ref.urlcharSloanDisplay the SDSS data for this starmeta.ref.urlchar_RAPosition from IAU name (right ascension part)degpos.eq.ra;meta.main_DEPosition from IAU name (declination part)degpos.eq.dec;meta.main