J/ApJ/823/157ivo://CDS.VizieR/J/ApJ/823/157doi:10.26093/cds/vizier.18230157CDSIshigaki M.N.Hwang N.Chiba M.Aoki W.2017-01-23T22:00:00Z2016-09-22T13:30:10ZCDS support team

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

cds-question@unistra.frglobular-star-clustersmetallicityradial-velocityvisible-astronomysloan-photometryinfrared-astronomyspectroscopyWe present Subaru/Faint Object Camera and Spectrograph and Keck/Deep Imaging Multi-Object Spectrometer medium-resolution spectroscopy of a tidally disrupting Milky Way (MW) globular cluster Palomar 5 (Pal 5) and its tidal stream. The observed fields are located to cover an angular extent of ~17{deg} along the stream, providing an opportunity to investigate a trend in line-of-sight velocities (V_los_) along the stream, which is essential to constrain its orbit and underlying gravitational potential of the MW's dark matter halo. A spectral fitting technique is applied to the observed spectra to obtain stellar parameters and metallicities ([Fe/H]) of the target stars. The 19 stars most likely belonging to the central Pal 5 cluster have a mean V_los_ of -58.1+/-0.7km/s and metallicity [Fe/H]=-1.35+/-0.06dex, both of which are in good agreement with those derived in previous high-resolution spectroscopic studies. Assuming that the stream stars have the same [Fe/H] as the progenitor cluster, the derived [Fe/H] and V_los_ values are used to estimate the possible V_los_ range of the member stars at each location along the stream. Because of the heavy contamination of the field MW stars, the estimated V_los_ range depends on prior assumptions about the stream's V_los_, which highlights the importance of more definitely identifying the member stars using proper motion and chemical abundances to obtain unbiased information of V_los_ in the outer part of the Pal 5 stream. The models for the gravitational potential of the MW's dark matter halo that are compatible with the estimated V_los_ range are discussed.2016ApJ...823..157Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/823/157CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJ/819/1 : Wide-field photometry of the GC Palomar 5 (Ibata+, 2016)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/ApJ/753/64 : Detailed abundances for 97 metal-poor stars (Ishigaki+, 2012)J/A+A/525/A90 : Thick disc vertical properties (Katz+, 2011)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/ApJ/705/328 : Abundance measurements in Sculptor dSph (Kirby+, 2009)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/823/157https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/823/157http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/823/157https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/823/157https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/823/157http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/823/157GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/823/157/table5 (Stars in the DEIMOS fields selected by the CMD, [Fe/H] and proper motion criteria)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/823/157/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/823/157/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/823/157/table5?GETtext/xml+votable180.050000true227.30743-2.0780.005555555555555556Cone search capability for table J/ApJ/823/157/table4 (Identified Pal 5 member stars in the FOCAS fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/823/157/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/823/157/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/823/157/table4?GETtext/xml+votable180.050000true228.99337-0.145270.0055555555555555566/31392 31393 31396 31398 31399 31411 31412 31414 31450 31451 31460 31619 45045https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/823/157?format=asciiOpticalInfrareddefaultJ/ApJ/823/157/table5Stars in the DEIMOS fields selected by the CMD, [Fe/H] and proper motion criteriarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldKeck/DEIMOS field name (FD1 to FD10)meta.id.part;meta.maincharName[1/80] Star name within the fieldmeta.id.part;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmag0[17/20.9] Extinction corrected SDSS g band magnitudemagphot.mag;em.opt.BfloatHRV[-306/341] Heliocentric line-of-sight velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[1/10] Error in HRVkm/sstat.errorfloat[Fe/H][-2.1/-0.6] Metallicityphys.abund.ZfloatLOS[ny] Status of line-of-sight velocity criterion (1)meta.codecharf_Name[K] Flag on FD3-008 (2)meta.codecharDR9Display the SDSS-DR9 data (Adelman-McCarthy+, 2012, V/139) within 1"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharJ/ApJ/823/157/table4Identified Pal 5 member stars in the FOCAS fieldsDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVlos[-66/-51] Line-of-sight velocitykm/sphys.veloc;pos.heliocentricfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldSubaru/FOCAS field name (CE1 or CE2)meta.id.part;meta.maincharNameStar name within the field (s1 to s24)meta.id.part;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainTeff[4902/5927] Effective temperatureKphys.temperature.effectiveintlogg[1.8/5] Spectroscopic log of surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-1.9/-1] Spectroscopic abundance [Fe/H]log(Sun)phys.abund.Fefloat[a/Fe][-0.3/0.7] Spectroscopic abundance [{alpha}/Fe]log(Sun)phys.abundfloatlogg2[2.5/4] Photometric log of surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]2[-1.8/-1] Photometric abundance [Fe/H]log(Sun)phys.abund.Fefloat[a/Fe]2[0.08/1.5] Photometric abundance [{alpha}/H]log(Sun)phys.abundfloatS/N[10/41] Signal to noise ratiostat.snrintDR9Display the SDSS-DR9 data (Adelman-McCarthy+, 2012, V/139) within 1"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar