J/ApJ/920/92ivo://CDS.VizieR/J/ApJ/920/92doi:10.26093/cds/vizier.19200092CDSJenkins S.A.Li T.S.Pace A.B.Ji A.P.Koposov S.E.Mutlu-Pakdil B.2024-11-06T20:23:30Z2024-02-12T12:53:13ZCDS support team

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

cds-question@unistra.frdwarf-galaxiesinfrared-astronomyspectroscopyradial-velocityWe perform consistent reductions and measurements for three ultra-faint dwarf galaxies (UFDs): Bootes I, Leo IV, and Leo V. Using the public archival data from the GIRAFFE spectrograph on the Very Large Telescope (VLT), we locate new members and provide refined measurements of physical parameters for these dwarf galaxies. We identify nine new Leo IV members and four new Leo V members, and perform a comparative analysis of previously discovered members. Additionally, we identify one new binary star in both Leo IV and Leo V. After removing binary stars, we recalculate the velocity dispersions of Bootes I and Leo IV to be 5.1_-0.8_^+0.7^ and 3.4_-0.9_^+1.3^km/s, respectively; we do not resolve the Leo V velocity dispersion. We identify a weak velocity gradient in Leo V that is ~4x smaller than the previously calculated gradient and that has a corresponding position angle that differs from the value in the literature by ~120{deg}. Combining the VLT data with previous values from the literature, we reanalyze the Bootes I metallicity distribution function and find that a model including infall of pristine gas, while Bootes I was forming stars' best fits the data. Our analysis of Leo IV, Leo V, and other UFDs will enhance our understanding of these enigmatic stellar populations and contribute to future dark matter studies. This is the first in a series of papers examining 13 UDFs observed with VLT/GIRAFFE between 2009 and 2017. Similar analyses of the remaining 10 UFDs will be presented in forthcoming papers.2021ApJ...920...92Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/920/92CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+A/407/1157 : UVES sky atlas (Hanuschik+, 2003)J/A+A/442/1127 : Library of 2500-10500{AA} synthetic spectra (Munari+, 2005)J/AJ/131/2114 : Radial velocities in Fornax dSph (Walker+, 2006)J/MNRAS/380/281 : Faint galactic satellites spectroscopy (Martin+, 2007)J/ApJ/692/1464 : Spectroscopy of Segue 1 (Geha+, 2009)J/ApJ/694/L144 : Spectroscopic study of Leo V dSph (Walker+, 2009)J/ApJ/710/1664 : BV photometry in Leo IV and Leo V dSphs (de Jong+, 2010)J/ApJ/723/1632 : Abundance spreads in Bootes I and Segue 1 (Norris+, 2010)J/MNRAS/411/1013 : CaII triplet in Sextans dSph galaxy (Battaglia+, 2011)J/ApJ/736/146 : Radial velocities of stars in Bootes I (Koposov+, 2011)J/ApJ/733/46 : Velocity measurements in Segue 1 (Simon+, 2011)J/ApJ/756/79 : Opt photometry in 3 Local Group dwarf galaxies (Sand+, 2012)J/MNRAS/434/1681 : Extremely metal-poor stars CaII triplet (Carrera+, 2013)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/ApJ/808/95 : Spectroscopy of Reticulum II (Simon+, 2015)J/ApJ/808/108 : M2FS stellar spectroscopy of Reticulum 2 (Walker+, 2015)J/ApJ/826/110 : Boo-127 and Boo-980 high-resolution spectra (Frebel+, 2016)J/ApJ/819/53 : Magellan/M2FS spectroscopy of Tucana2 &Grus1 (Walker+, 2016)J/ApJ/857/74 : Abundances of 7 new member stars in Tucana II (Chiti+, 2018)J/MNRAS/479/5343 : Nearby dwarf galaxy in Magellanic bridge (Koposov+, 2018)J/ApJ/855/43 : Distant RR Lyrae stars discovered with HiTS (Medina+, 2018)J/A+A/623/A129 : New satellites of the LMC search (Fritz+, 2019)J/MNRAS/490/3508 : The Southern Stellar Stream Sp. Survey (S^5^) (Li+, 2019)J/ApJ/885/53 : Spectro & HST photo of galaxy Leo V (Mutlu-Pakdil+, 2019)J/AJ/159/46 : Elemental abundances 416 stars in 5 dSphs M31 (Kirby+, 2020)J/A+A/635/A107 : Spectroscopy of the Eri 2 cluster (Zoutendijk+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/920/92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/920/92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/920/92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/920/92https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/920/92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/920/92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/920/92/table6 (Measurements of all observed stars in Bootes I, Leo IV and Leo V)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/920/92/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/920/92/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/920/92/table6?GETtext/xml+votable180.050000true209.839041714.60172220.0055555555555555566/8745 26980 27000 27002-27003https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/920/92?format=asciiInfrareddefaultJ/ApJ/920/92/table6Measurements of all observed stars in Bootes I, Leo IV and Leo VrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharRAJ2000[172/211] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-1/15] Declination (J2000)degpos.eq.dec;meta.mainS/N[0.4/1428] Signal-to-Noise ratiostat.snrfloatRVel[-804/507] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_RVel[0.7/813] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatCaT[-1.47/52.76]? CaT equivalent width; see Section 3 (in {AA})0.1nmspect.line.eqWidthfloatnullablee_CaT[0/18]? Uncertainty in CaT0.1nmstat.errorfloatnullableMg[-400/7.08]? Mg equivalent width (in {AA})0.1nmspect.line.eqWidthfloatnullablee_Mg[0/82]? Uncertainty in Mg0.1nmstat.errorfloatnullableGoodProb[0.15/1] Probabiblility of spectrum being good quality (1)stat.fit.goodnessfloatMemProb[0/1]? Probability star is a member; Section 4meta.idfloatnullablee_MemProb[0/1]? Lower uncertainty in MemProbstat.errorfloatnullableE_MemProb[0/0.43]? Upper uncertainty in MemProbstat.error;stat.maxfloatnullableMember[-1/1] Subjective membership classification (2)src.classint