J/ApJ/809/59ivo://CDS.VizieR/J/ApJ/809/59doi:10.26093/cds/vizier.18090059CDSSesar B.Bovy J.Bernard E.J.Caldwell N.Cohen J.G.Fouesneau M.,Johnson C.I.Ness M.Ferguson A.M.N.Martin N.F.Price-Whelan A.M.,Rix H.-W.Schlafly E.F.Burgett W.S.Chambers K.C.Flewelling H.,Hodapp K.W.Kaiser N.Magnier E.A.Platais I.Tonry J.L.Waters C.,Wyse R.F.G.2017-08-28T07:26:22Z2016-01-13T08:12:49ZCDS support team

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

cds-question@unistra.frgiant-starsinfrared-photometryvisible-astronomybroad-band-photometryproper-motionsline-intensitiesThe Ophiuchus stream is a recently discovered stellar tidal stream in the Milky Way. We present high-quality spectroscopic data for 14 stream member stars obtained using the Keck and MMT telescopes. We confirm the stream as a fast moving (v_los_~290km/s), kinematically cold group ({sigma}_{nu}_los__<~1km/s) of {alpha}-enhanced and metal-poor stars ([{alpha}/Fe]~0.4dex, [Fe/H]~-2.0dex). Using a probabilistic technique, we model the stream simultaneously in line-of-sight velocity, color-magnitude, coordinate, and proper motion space, and so determine its distribution in 6D phase-space. We find that the stream extends in distance from 7.5 to 9kpc from the Sun; it is 50 times longer than wide, merely appearing highly foreshortened in projection. The analysis of the stellar population contained in the stream suggests that it is ~12Gyr old, and that its initial stellar mass was ~2x10^4^M_{sun}_ (or at least >~7x10^3^M_{sun}_). Assuming a fiducial Milky Way potential, we fit an orbit to the stream that matches the observed phase-space distribution, except for some tension in the proper motions: the stream has an orbital period of ~350Myr, and is on a fairly eccentric orbit (e~0.66) with a pericenter of ~3.5kpc and an apocenter of ~17kpc. The phase-space structure and stellar population of the stream show that its progenitor must have been a globular cluster that was disrupted only ~240Myr ago. We do not detect any significant overdensity of stars along the stream that would indicate the presence of a progenitor, and conclude that the stream is all that is left of the progenitor.2015ApJ...809...59Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/809/59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/800/120 : Profiles of z<0.5 galaxies with Pan-STARRS1 (Zheng+, 2015)J/A+A/559/A43 : Pan-STARRS1 (PS1) observations of the Hyades (Goldman+, 2013)J/ApJ/776/26 : RRab stars in the Orphan stream distances (Sesar+, 2013)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/ApJ/736/146 : Radial velocities of stars in Bootes I (Koposov+, 2011)J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)J/AJ/127/3034 : Proper-motion catalog combining USNO-B and SDSS (Munn+, 2004)J/AJ/124/1144 : Orbits of single-lined spectroscopic binaries (Latham, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/809/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/809/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/809/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/809/59https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/809/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/809/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/809/59/table1 (Ophiuchus stream member stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/809/59/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/809/59/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/809/59/table1?GETtext/xml+votable180.050000true241.52271-7.015550.0055555555555555566/30902 30903 30905 30908https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/809/59?format=asciiInfraredOpticaldefaultJ/ApJ/809/59/table1Ophiuchus stream member starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument code (D: DEIMOS or H: Hectochelle)meta.code;instrcharNameStar name (1)meta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmag[15.6/19.3]? PS1 g_P1_ band magnitude (2)magphot.mag;em.opt.Bfloatnullablee_gmag[0.01/0.02]? gmag uncertainty (2)magstat.error;phot.mag;em.opt.Bfloatnullablermag[15.5/18.9]? PS1 r_P1_ band magnitude (2)magphot.mag;em.opt.Rfloatnullablee_rmag[0.01/0.02]? rmag uncertainty (2)magstat.error;phot.mag;em.opt.Rfloatnullableimag[15.5/18.8]? PS1 i_P1_ band magnitude (2)magphot.mag;em.opt.Ifloatnullablee_imag[0.01/0.02]? imag uncertainty (2)magstat.error;phot.mag;em.opt.Ifloatnullablezmag[15.5/18.7]? PS1 z_P1_ band magnitude (2)magphot.mag;em.opt.Ifloatnullablee_zmag[0.02]? zmag uncertainty (2)magstat.error;phot.mag;em.opt.Ifloatnullableymag[15.5/18.7]? PS1 y_P1_ band magnitude (2)magphot.mag;em.IR.Jfloatnullablee_ymag[0.02/0.03]? ymag uncertainty (2)magstat.error;phot.mag;em.opt.VfloatnullableVlos[285/292] Line-of-sight velocity ({nu}_los_) (3)km/sphys.veloc;pos.heliocentricfloate_Vlos[0.5/3] Vlos uncertainty (4)km/sstat.errorfloatDM[14.4/14.8]? Distance modulus (5)magphot.mag.distModfloatnullablee_DM[0.05/0.06]? Negative error on DM (5)magstat.errorfloatnullableE_DM[0.05/0.06]? Positive error on DM (5)magstat.error;stat.maxfloatnullablepml[-24/-3]? Proper motion along GLON (6)mas/yrpos.pmfloatnullablee_pml[1/3]? pml uncertaintymas/yrstat.errorfloatnullablepmb[-15/8]? Proper motion along GLAT ({mu}_b_)mas/yrpos.pmfloatnullablee_pmb[1/3]? pmb uncertaintymas/yrstat.errorfloatnullableNlNumber of line used for abundance measurements for this starmeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/809/59/table2Lines used for abundance measurementsIonElementphys.atmol.ionStagecharEW[9.1/332.8] Equivalent width0.0001nmspect.line.eqWidthfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (rgb1 to rgb5)meta.id;meta.maincharlambda[5162.2/5284.1] Rest wavelength, Angstroms0.1nmem.wldoubleExPot[0/4.2] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-5/0.02] Oscillator strengthphys.atmol.oscStrengthfloatrEW[-5.8/5.4] Reduced equivalent widthspect.line.eqWidthfloat